diff --git a/backend/src/main/java/net/beetechgroup/beetask/entities/UserSignature.java b/backend/src/main/java/net/beetechgroup/beetask/entities/UserSignature.java
new file mode 100644
index 0000000..3ded8c2
--- /dev/null
+++ b/backend/src/main/java/net/beetechgroup/beetask/entities/UserSignature.java
@@ -0,0 +1,102 @@
+package net.beetechgroup.beetask.entities;
+
+import java.time.LocalDateTime;
+
+public class UserSignature {
+    private Long id;
+    private Long userId;
+    private String name;
+    private String signatureType; // 'UPLOAD', 'DRAW', 'TEMPLATE'
+    private String imageUrl;
+    private String storageKey;
+    private boolean isDefault;
+    private LocalDateTime createdAt;
+    private LocalDateTime updatedAt;
+
+    public UserSignature() {
+    }
+
+    public UserSignature(Long id, Long userId, String name, String signatureType, String imageUrl, String storageKey, boolean isDefault, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.userId = userId;
+        this.name = name;
+        this.signatureType = signatureType;
+        this.imageUrl = imageUrl;
+        this.storageKey = storageKey;
+        this.isDefault = isDefault;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getUserId() {
+        return userId;
+    }
+
+    public void setUserId(Long userId) {
+        this.userId = userId;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getSignatureType() {
+        return signatureType;
+    }
+
+    public void setSignatureType(String signatureType) {
+        this.signatureType = signatureType;
+    }
+
+    public String getImageUrl() {
+        return imageUrl;
+    }
+
+    public void setImageUrl(String imageUrl) {
+        this.imageUrl = imageUrl;
+    }
+
+    public String getStorageKey() {
+        return storageKey;
+    }
+
+    public void setStorageKey(String storageKey) {
+        this.storageKey = storageKey;
+    }
+
+    public boolean isDefault() {
+        return isDefault;
+    }
+
+    public void setDefault(boolean isDefault) {
+        this.isDefault = isDefault;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+}
diff --git a/backend/src/main/java/net/beetechgroup/beetask/frameworks/config/UserUseCaseConfig.java b/backend/src/main/java/net/beetechgroup/beetask/frameworks/config/UserUseCaseConfig.java
index b1335cd..8be50aa 100644
--- a/backend/src/main/java/net/beetechgroup/beetask/frameworks/config/UserUseCaseConfig.java
+++ b/backend/src/main/java/net/beetechgroup/beetask/frameworks/config/UserUseCaseConfig.java
@@ -68,4 +68,38 @@ public class UserUseCaseConfig {
     public net.beetechgroup.beetask.usecase.user.list.ListAllUsersUseCase listAllUsersUseCase(UserRepository userRepository) {
         return new net.beetechgroup.beetask.usecase.user.list.ListAllUsersUseCase(userRepository);
     }
+
+    @Produces
+    public net.beetechgroup.beetask.usecase.user.signature.ListUserSignaturesUseCase listUserSignaturesUseCase(
+            UserRepository userRepository,
+            net.beetechgroup.beetask.usecase.repository.UserSignatureRepository userSignatureRepository
+    ) {
+        return new net.beetechgroup.beetask.usecase.user.signature.ListUserSignaturesUseCase(userRepository, userSignatureRepository);
+    }
+
+    @Produces
+    public net.beetechgroup.beetask.usecase.user.signature.CreateUserSignatureUseCase createUserSignatureUseCase(
+            UserRepository userRepository,
+            net.beetechgroup.beetask.usecase.repository.UserSignatureRepository userSignatureRepository,
+            StorageRepository storageRepository
+    ) {
+        return new net.beetechgroup.beetask.usecase.user.signature.CreateUserSignatureUseCase(userRepository, userSignatureRepository, storageRepository);
+    }
+
+    @Produces
+    public net.beetechgroup.beetask.usecase.user.signature.SetDefaultUserSignatureUseCase setDefaultUserSignatureUseCase(
+            UserRepository userRepository,
+            net.beetechgroup.beetask.usecase.repository.UserSignatureRepository userSignatureRepository
+    ) {
+        return new net.beetechgroup.beetask.usecase.user.signature.SetDefaultUserSignatureUseCase(userRepository, userSignatureRepository);
+    }
+
+    @Produces
+    public net.beetechgroup.beetask.usecase.user.signature.DeleteUserSignatureUseCase deleteUserSignatureUseCase(
+            UserRepository userRepository,
+            net.beetechgroup.beetask.usecase.repository.UserSignatureRepository userSignatureRepository,
+            StorageRepository storageRepository
+    ) {
+        return new net.beetechgroup.beetask.usecase.user.signature.DeleteUserSignatureUseCase(userRepository, userSignatureRepository, storageRepository);
+    }
 }
diff --git a/backend/src/main/java/net/beetechgroup/beetask/frameworks/persistence/entities/UserSignatureEntity.java b/backend/src/main/java/net/beetechgroup/beetask/frameworks/persistence/entities/UserSignatureEntity.java
new file mode 100644
index 0000000..57654f2
--- /dev/null
+++ b/backend/src/main/java/net/beetechgroup/beetask/frameworks/persistence/entities/UserSignatureEntity.java
@@ -0,0 +1,118 @@
+package net.beetechgroup.beetask.frameworks.persistence.entities;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "user_signatures")
+public class UserSignatureEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "user_id", nullable = false)
+    private UserEntity user;
+
+    @Column(nullable = false)
+    private String name;
+
+    @Column(name = "signature_type", nullable = false, length = 50)
+    private String signatureType;
+
+    @Column(name = "image_url", nullable = false, length = 1024)
+    private String imageUrl;
+
+    @Column(name = "storage_key", length = 512)
+    private String storageKey;
+
+    @Column(name = "is_default", nullable = false)
+    private boolean isDefault;
+
+    @Column(name = "created_at", nullable = false)
+    private LocalDateTime createdAt = LocalDateTime.now();
+
+    @Column(name = "updated_at", nullable = false)
+    private LocalDateTime updatedAt = LocalDateTime.now();
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public UserEntity getUser() {
+        return user;
+    }
+
+    public void setUser(UserEntity user) {
+        this.user = user;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getSignatureType() {
+        return signatureType;
+    }
+
+    public void setSignatureType(String signatureType) {
+        this.signatureType = signatureType;
+    }
+
+    public String getImageUrl() {
+        return imageUrl;
+    }
+
+    public void setImageUrl(String imageUrl) {
+        this.imageUrl = imageUrl;
+    }
+
+    public String getStorageKey() {
+        return storageKey;
+    }
+
+    public void setStorageKey(String storageKey) {
+        this.storageKey = storageKey;
+    }
+
+    public boolean isDefault() {
+        return isDefault;
+    }
+
+    public void setDefault(boolean aDefault) {
+        isDefault = aDefault;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+}
diff --git a/backend/src/main/java/net/beetechgroup/beetask/frameworks/persistence/mapper/UserSignatureEntityMapper.java b/backend/src/main/java/net/beetechgroup/beetask/frameworks/persistence/mapper/UserSignatureEntityMapper.java
new file mode 100644
index 0000000..763e438
--- /dev/null
+++ b/backend/src/main/java/net/beetechgroup/beetask/frameworks/persistence/mapper/UserSignatureEntityMapper.java
@@ -0,0 +1,42 @@
+package net.beetechgroup.beetask.frameworks.persistence.mapper;
+
+import net.beetechgroup.beetask.entities.UserSignature;
+import net.beetechgroup.beetask.frameworks.persistence.entities.UserEntity;
+import net.beetechgroup.beetask.frameworks.persistence.entities.UserSignatureEntity;
+
+public class UserSignatureEntityMapper {
+
+    public static UserSignature toDomain(UserSignatureEntity entity) {
+        if (entity == null) return null;
+        return new UserSignature(
+                entity.getId(),
+                entity.getUser() != null ? entity.getUser().getId() : null,
+                entity.getName(),
+                entity.getSignatureType(),
+                entity.getImageUrl(),
+                entity.getStorageKey(),
+                entity.isDefault(),
+                entity.getCreatedAt(),
+                entity.getUpdatedAt()
+        );
+    }
+
+    public static UserSignatureEntity toEntity(UserSignature domain, UserEntity userEntity) {
+        if (domain == null) return null;
+        UserSignatureEntity entity = new UserSignatureEntity();
+        entity.setId(domain.getId());
+        entity.setUser(userEntity);
+        entity.setName(domain.getName());
+        entity.setSignatureType(domain.getSignatureType());
+        entity.setImageUrl(domain.getImageUrl());
+        entity.setStorageKey(domain.getStorageKey());
+        entity.setDefault(domain.isDefault());
+        if (domain.getCreatedAt() != null) {
+            entity.setCreatedAt(domain.getCreatedAt());
+        }
+        if (domain.getUpdatedAt() != null) {
+            entity.setUpdatedAt(domain.getUpdatedAt());
+        }
+        return entity;
+    }
+}
diff --git a/backend/src/main/java/net/beetechgroup/beetask/frameworks/persistence/repository/UserSignatureRepositoryImpl.java b/backend/src/main/java/net/beetechgroup/beetask/frameworks/persistence/repository/UserSignatureRepositoryImpl.java
new file mode 100644
index 0000000..8b272a8
--- /dev/null
+++ b/backend/src/main/java/net/beetechgroup/beetask/frameworks/persistence/repository/UserSignatureRepositoryImpl.java
@@ -0,0 +1,75 @@
+package net.beetechgroup.beetask.frameworks.persistence.repository;
+
+import io.quarkus.hibernate.orm.panache.PanacheRepository;
+import jakarta.enterprise.context.ApplicationScoped;
+import jakarta.inject.Inject;
+import jakarta.persistence.EntityManager;
+import jakarta.transaction.Transactional;
+import net.beetechgroup.beetask.entities.UserSignature;
+import net.beetechgroup.beetask.frameworks.persistence.entities.UserEntity;
+import net.beetechgroup.beetask.frameworks.persistence.entities.UserSignatureEntity;
+import net.beetechgroup.beetask.frameworks.persistence.mapper.UserSignatureEntityMapper;
+import net.beetechgroup.beetask.usecase.repository.UserSignatureRepository;
+
+import java.util.List;
+import java.util.Optional;
+
+@ApplicationScoped
+public class UserSignatureRepositoryImpl implements UserSignatureRepository, PanacheRepository<UserSignatureEntity> {
+
+    @Inject
+    EntityManager em;
+
+    @Override
+    @Transactional
+    public List<UserSignature> findByUserId(Long userId) {
+        return find("user.id = ?1 order by isDefault desc, createdAt desc", userId)
+                .list()
+                .stream()
+                .map(UserSignatureEntityMapper::toDomain)
+                .toList();
+    }
+
+    @Override
+    @Transactional
+    public Optional<UserSignature> findSignatureById(Long id) {
+        return findByIdOptional(id).map(UserSignatureEntityMapper::toDomain);
+    }
+
+    @Override
+    @Transactional
+    public UserSignature save(UserSignature signature) {
+        UserEntity userEntity = em.getReference(UserEntity.class, signature.getUserId());
+        UserSignatureEntity entity = UserSignatureEntityMapper.toEntity(signature, userEntity);
+
+        if (entity.getId() == null) {
+            persist(entity);
+        } else {
+            UserSignatureEntity existing = findById(entity.getId());
+            if (existing != null) {
+                existing.setName(entity.getName());
+                existing.setSignatureType(entity.getSignatureType());
+                existing.setImageUrl(entity.getImageUrl());
+                existing.setStorageKey(entity.getStorageKey());
+                existing.setDefault(entity.isDefault());
+                existing.setUpdatedAt(java.time.LocalDateTime.now());
+                entity = existing;
+            } else {
+                entity = em.merge(entity);
+            }
+        }
+        return UserSignatureEntityMapper.toDomain(entity);
+    }
+
+    @Override
+    @Transactional
+    public void delete(Long id) {
+        deleteById(id);
+    }
+
+    @Override
+    @Transactional
+    public void unsetDefaultForUser(Long userId) {
+        update("isDefault = false where user.id = ?1", userId);
+    }
+}
diff --git a/backend/src/main/java/net/beetechgroup/beetask/interfaceadapters/controllers/user/CreateSignatureForm.java b/backend/src/main/java/net/beetechgroup/beetask/interfaceadapters/controllers/user/CreateSignatureForm.java
new file mode 100644
index 0000000..59708c6
--- /dev/null
+++ b/backend/src/main/java/net/beetechgroup/beetask/interfaceadapters/controllers/user/CreateSignatureForm.java
@@ -0,0 +1,22 @@
+package net.beetechgroup.beetask.interfaceadapters.controllers.user;
+
+import org.jboss.resteasy.reactive.RestForm;
+import org.jboss.resteasy.reactive.multipart.FileUpload;
+
+public class CreateSignatureForm {
+
+    @RestForm("file")
+    public FileUpload file;
+
+    @RestForm("imageBase64")
+    public String imageBase64;
+
+    @RestForm("name")
+    public String name;
+
+    @RestForm("signatureType")
+    public String signatureType; // "UPLOAD", "DRAW", "TEMPLATE"
+
+    @RestForm("isDefault")
+    public Boolean isDefault;
+}
diff --git a/backend/src/main/java/net/beetechgroup/beetask/interfaceadapters/controllers/user/UserSignatureController.java b/backend/src/main/java/net/beetechgroup/beetask/interfaceadapters/controllers/user/UserSignatureController.java
new file mode 100644
index 0000000..aae19c3
--- /dev/null
+++ b/backend/src/main/java/net/beetechgroup/beetask/interfaceadapters/controllers/user/UserSignatureController.java
@@ -0,0 +1,141 @@
+package net.beetechgroup.beetask.interfaceadapters.controllers.user;
+
+import io.quarkus.security.Authenticated;
+import io.quarkus.security.identity.SecurityIdentity;
+import jakarta.inject.Inject;
+import jakarta.ws.rs.Consumes;
+import jakarta.ws.rs.DELETE;
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.POST;
+import jakarta.ws.rs.PUT;
+import jakarta.ws.rs.Path;
+import jakarta.ws.rs.PathParam;
+import jakarta.ws.rs.Produces;
+import jakarta.ws.rs.core.MediaType;
+import jakarta.ws.rs.core.Response;
+import net.beetechgroup.beetask.entities.UserSignature;
+import net.beetechgroup.beetask.usecase.user.signature.CreateUserSignatureInput;
+import net.beetechgroup.beetask.usecase.user.signature.CreateUserSignatureUseCase;
+import net.beetechgroup.beetask.usecase.user.signature.DeleteUserSignatureUseCase;
+import net.beetechgroup.beetask.usecase.user.signature.ListUserSignaturesUseCase;
+import net.beetechgroup.beetask.usecase.user.signature.SetDefaultUserSignatureUseCase;
+import org.eclipse.microprofile.openapi.annotations.Operation;
+import org.eclipse.microprofile.openapi.annotations.tags.Tag;
+import org.jboss.logging.Logger;
+
+import java.nio.file.Files;
+import java.util.Base64;
+import java.util.List;
+
+@Path("/auth/profile/signatures")
+@Produces(MediaType.APPLICATION_JSON)
+@Authenticated
+@Tag(name = "User Signatures", description = "Gerenciamento de assinaturas digitais do usuário")
+public class UserSignatureController {
+    private static final Logger LOGGER = Logger.getLogger(UserSignatureController.class);
+
+    @Inject
+    SecurityIdentity securityIdentity;
+
+    @Inject
+    ListUserSignaturesUseCase listUserSignaturesUseCase;
+
+    @Inject
+    CreateUserSignatureUseCase createUserSignatureUseCase;
+
+    @Inject
+    SetDefaultUserSignatureUseCase setDefaultUserSignatureUseCase;
+
+    @Inject
+    DeleteUserSignatureUseCase deleteUserSignatureUseCase;
+
+    @GET
+    @Operation(summary = "Listar assinaturas do usuário autenticado")
+    public List<UserSignatureResponse> listSignatures() {
+        String email = securityIdentity.getPrincipal().getName();
+        return listUserSignaturesUseCase.execute(email).stream()
+                .map(UserSignatureResponse::from)
+                .toList();
+    }
+
+    @POST
+    @Consumes(MediaType.MULTIPART_FORM_DATA)
+    @Operation(summary = "Cadastrar nova assinatura digital")
+    public Response createSignature(CreateSignatureForm form) {
+        String email = securityIdentity.getPrincipal().getName();
+
+        byte[] imageBytes = null;
+        String contentType = "image/png";
+
+        if (form.file != null && form.file.filePath() != null) {
+            try {
+                imageBytes = Files.readAllBytes(form.file.filePath());
+                if (form.file.contentType() != null && !form.file.contentType().isBlank()) {
+                    contentType = form.file.contentType();
+                }
+            } catch (Exception e) {
+                LOGGER.errorf("Erro ao ler arquivo da assinatura: %s", e.getMessage());
+                return Response.status(Response.Status.BAD_REQUEST)
+                        .entity("{\"error\": \"Falha ao ler o arquivo enviado.\"}")
+                        .build();
+            }
+        } else if (form.imageBase64 != null && !form.imageBase64.isBlank()) {
+            try {
+                String raw = form.imageBase64.trim();
+                if (raw.contains(",")) {
+                    String header = raw.substring(0, raw.indexOf(","));
+                    if (header.contains("image/jpeg") || header.contains("image/jpg")) {
+                        contentType = "image/jpeg";
+                    } else if (header.contains("image/webp")) {
+                        contentType = "image/webp";
+                    }
+                    raw = raw.substring(raw.indexOf(",") + 1);
+                }
+                imageBytes = Base64.getDecoder().decode(raw);
+            } catch (Exception e) {
+                LOGGER.errorf("Erro ao decodificar imagem base64: %s", e.getMessage());
+                return Response.status(Response.Status.BAD_REQUEST)
+                        .entity("{\"error\": \"Dados de imagem base64 inválidos.\"}")
+                        .build();
+            }
+        }
+
+        if (imageBytes == null || imageBytes.length == 0) {
+            return Response.status(Response.Status.BAD_REQUEST)
+                    .entity("{\"error\": \"A imagem da assinatura é obrigatória.\"}")
+                    .build();
+        }
+
+        CreateUserSignatureInput input = new CreateUserSignatureInput(
+                email,
+                form.name,
+                form.signatureType,
+                form.isDefault,
+                imageBytes,
+                contentType
+        );
+
+        UserSignature created = createUserSignatureUseCase.execute(input);
+        return Response.status(Response.Status.CREATED)
+                .entity(UserSignatureResponse.from(created))
+                .build();
+    }
+
+    @PUT
+    @Path("/{id}/default")
+    @Operation(summary = "Definir assinatura como padrão")
+    public Response setDefault(@PathParam("id") Long id) {
+        String email = securityIdentity.getPrincipal().getName();
+        UserSignature signature = setDefaultUserSignatureUseCase.execute(id, email);
+        return Response.ok(UserSignatureResponse.from(signature)).build();
+    }
+
+    @DELETE
+    @Path("/{id}")
+    @Operation(summary = "Excluir assinatura")
+    public Response delete(@PathParam("id") Long id) {
+        String email = securityIdentity.getPrincipal().getName();
+        deleteUserSignatureUseCase.execute(id, email);
+        return Response.noContent().build();
+    }
+}
diff --git a/backend/src/main/java/net/beetechgroup/beetask/interfaceadapters/controllers/user/UserSignatureResponse.java b/backend/src/main/java/net/beetechgroup/beetask/interfaceadapters/controllers/user/UserSignatureResponse.java
new file mode 100644
index 0000000..359e395
--- /dev/null
+++ b/backend/src/main/java/net/beetechgroup/beetask/interfaceadapters/controllers/user/UserSignatureResponse.java
@@ -0,0 +1,25 @@
+package net.beetechgroup.beetask.interfaceadapters.controllers.user;
+
+import net.beetechgroup.beetask.entities.UserSignature;
+
+import java.time.format.DateTimeFormatter;
+
+public record UserSignatureResponse(
+        Long id,
+        String name,
+        String signatureType,
+        String imageUrl,
+        boolean isDefault,
+        String createdAt
+) {
+    public static UserSignatureResponse from(UserSignature s) {
+        return new UserSignatureResponse(
+                s.getId(),
+                s.getName(),
+                s.getSignatureType(),
+                s.getImageUrl(),
+                s.isDefault(),
+                s.getCreatedAt() != null ? s.getCreatedAt().format(DateTimeFormatter.ISO_LOCAL_DATE_TIME) : null
+        );
+    }
+}
diff --git a/backend/src/main/java/net/beetechgroup/beetask/usecase/repository/UserSignatureRepository.java b/backend/src/main/java/net/beetechgroup/beetask/usecase/repository/UserSignatureRepository.java
new file mode 100644
index 0000000..2c30428
--- /dev/null
+++ b/backend/src/main/java/net/beetechgroup/beetask/usecase/repository/UserSignatureRepository.java
@@ -0,0 +1,13 @@
+package net.beetechgroup.beetask.usecase.repository;
+
+import net.beetechgroup.beetask.entities.UserSignature;
+import java.util.List;
+import java.util.Optional;
+
+public interface UserSignatureRepository {
+    List<UserSignature> findByUserId(Long userId);
+    Optional<UserSignature> findSignatureById(Long id);
+    UserSignature save(UserSignature signature);
+    void delete(Long id);
+    void unsetDefaultForUser(Long userId);
+}
diff --git a/backend/src/main/java/net/beetechgroup/beetask/usecase/user/signature/CreateUserSignatureInput.java b/backend/src/main/java/net/beetechgroup/beetask/usecase/user/signature/CreateUserSignatureInput.java
new file mode 100644
index 0000000..2f65be2
--- /dev/null
+++ b/backend/src/main/java/net/beetechgroup/beetask/usecase/user/signature/CreateUserSignatureInput.java
@@ -0,0 +1,10 @@
+package net.beetechgroup.beetask.usecase.user.signature;
+
+public record CreateUserSignatureInput(
+        String userEmail,
+        String name,
+        String signatureType,
+        Boolean isDefault,
+        byte[] imageBytes,
+        String contentType
+) {}
diff --git a/backend/src/main/java/net/beetechgroup/beetask/usecase/user/signature/CreateUserSignatureUseCase.java b/backend/src/main/java/net/beetechgroup/beetask/usecase/user/signature/CreateUserSignatureUseCase.java
new file mode 100644
index 0000000..84625df
--- /dev/null
+++ b/backend/src/main/java/net/beetechgroup/beetask/usecase/user/signature/CreateUserSignatureUseCase.java
@@ -0,0 +1,85 @@
+package net.beetechgroup.beetask.usecase.user.signature;
+
+import net.beetechgroup.beetask.entities.User;
+import net.beetechgroup.beetask.entities.UserSignature;
+import net.beetechgroup.beetask.usecase.exceptions.UserNotFoundException;
+import net.beetechgroup.beetask.usecase.repository.StorageRepository;
+import net.beetechgroup.beetask.usecase.repository.UserRepository;
+import net.beetechgroup.beetask.usecase.repository.UserSignatureRepository;
+import org.jboss.logging.Logger;
+
+import java.io.ByteArrayInputStream;
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.UUID;
+
+public class CreateUserSignatureUseCase {
+    private static final Logger LOGGER = Logger.getLogger(CreateUserSignatureUseCase.class);
+    private static final long MAX_SIZE_BYTES = 5L * 1024 * 1024;
+
+    private final UserRepository userRepository;
+    private final UserSignatureRepository userSignatureRepository;
+    private final StorageRepository storageRepository;
+
+    public CreateUserSignatureUseCase(UserRepository userRepository,
+                                    UserSignatureRepository userSignatureRepository,
+                                    StorageRepository storageRepository) {
+        this.userRepository = userRepository;
+        this.userSignatureRepository = userSignatureRepository;
+        this.storageRepository = storageRepository;
+    }
+
+    public UserSignature execute(CreateUserSignatureInput input) {
+        if (input.imageBytes() == null || input.imageBytes().length == 0) {
+            throw new IllegalArgumentException("A imagem da assinatura é obrigatória.");
+        }
+        if (input.imageBytes().length > MAX_SIZE_BYTES) {
+            throw new IllegalArgumentException("A imagem da assinatura deve ter no máximo 5 MB.");
+        }
+
+        User user = userRepository.findByEmail(input.userEmail())
+                .orElseThrow(() -> new UserNotFoundException("Usuário não encontrado: " + input.userEmail()));
+
+        List<UserSignature> existing = userSignatureRepository.findByUserId(user.getId());
+        boolean makeDefault = Boolean.TRUE.equals(input.isDefault()) || existing.isEmpty();
+
+        if (makeDefault) {
+            userSignatureRepository.unsetDefaultForUser(user.getId());
+        }
+
+        String sigName = input.name() != null && !input.name().isBlank()
+                ? input.name().trim()
+                : "Assinatura " + (existing.size() + 1);
+
+        String type = input.signatureType() != null && !input.signatureType().isBlank()
+                ? input.signatureType().toUpperCase()
+                : "UPLOAD";
+
+        String contentType = input.contentType() != null && !input.contentType().isBlank()
+                ? input.contentType()
+                : "image/png";
+
+        String storageKey = "signatures/" + user.getId() + "_" + System.currentTimeMillis() + "_" + UUID.randomUUID().toString().substring(0, 8) + ".png";
+
+        String imageUrl = storageRepository.upload(
+                storageKey,
+                new ByteArrayInputStream(input.imageBytes()),
+                contentType,
+                input.imageBytes().length
+        );
+
+        UserSignature signature = new UserSignature();
+        signature.setUserId(user.getId());
+        signature.setName(sigName);
+        signature.setSignatureType(type);
+        signature.setImageUrl(imageUrl);
+        signature.setStorageKey(storageKey);
+        signature.setDefault(makeDefault);
+        signature.setCreatedAt(LocalDateTime.now());
+        signature.setUpdatedAt(LocalDateTime.now());
+
+        UserSignature saved = userSignatureRepository.save(signature);
+        LOGGER.infof("Assinatura criada com sucesso para usuário %s, ID: %d, Tipo: %s", user.getEmail(), saved.getId(), type);
+        return saved;
+    }
+}
diff --git a/backend/src/main/java/net/beetechgroup/beetask/usecase/user/signature/DeleteUserSignatureUseCase.java b/backend/src/main/java/net/beetechgroup/beetask/usecase/user/signature/DeleteUserSignatureUseCase.java
new file mode 100644
index 0000000..011cae7
--- /dev/null
+++ b/backend/src/main/java/net/beetechgroup/beetask/usecase/user/signature/DeleteUserSignatureUseCase.java
@@ -0,0 +1,64 @@
+package net.beetechgroup.beetask.usecase.user.signature;
+
+import net.beetechgroup.beetask.entities.User;
+import net.beetechgroup.beetask.entities.UserSignature;
+import net.beetechgroup.beetask.usecase.exceptions.UserNotFoundException;
+import net.beetechgroup.beetask.usecase.repository.StorageRepository;
+import net.beetechgroup.beetask.usecase.repository.UserRepository;
+import net.beetechgroup.beetask.usecase.repository.UserSignatureRepository;
+import org.jboss.logging.Logger;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+public class DeleteUserSignatureUseCase {
+    private static final Logger LOGGER = Logger.getLogger(DeleteUserSignatureUseCase.class);
+
+    private final UserRepository userRepository;
+    private final UserSignatureRepository userSignatureRepository;
+    private final StorageRepository storageRepository;
+
+    public DeleteUserSignatureUseCase(UserRepository userRepository,
+                                      UserSignatureRepository userSignatureRepository,
+                                      StorageRepository storageRepository) {
+        this.userRepository = userRepository;
+        this.userSignatureRepository = userSignatureRepository;
+        this.storageRepository = storageRepository;
+    }
+
+    public void execute(Long signatureId, String userEmail) {
+        User user = userRepository.findByEmail(userEmail)
+                .orElseThrow(() -> new UserNotFoundException("Usuário não encontrado: " + userEmail));
+
+        UserSignature signature = userSignatureRepository.findSignatureById(signatureId)
+                .orElseThrow(() -> new IllegalArgumentException("Assinatura não encontrada: " + signatureId));
+
+        if (!signature.getUserId().equals(user.getId())) {
+            throw new SecurityException("Você não tem permissão para excluir esta assinatura.");
+        }
+
+        boolean wasDefault = signature.isDefault();
+
+        if (signature.getStorageKey() != null) {
+            try {
+                storageRepository.delete(signature.getStorageKey());
+            } catch (Exception e) {
+                LOGGER.warnf("Falha ao remover arquivo de assinatura do storage: %s", e.getMessage());
+            }
+        }
+
+        userSignatureRepository.delete(signatureId);
+        LOGGER.infof("Assinatura %d excluída pelo usuário %s", signatureId, userEmail);
+
+        if (wasDefault) {
+            List<UserSignature> remaining = userSignatureRepository.findByUserId(user.getId());
+            if (!remaining.isEmpty()) {
+                UserSignature nextDefault = remaining.get(0);
+                nextDefault.setDefault(true);
+                nextDefault.setUpdatedAt(LocalDateTime.now());
+                userSignatureRepository.save(nextDefault);
+                LOGGER.infof("Assinatura %d promovida a padrão após exclusão da anterior", nextDefault.getId());
+            }
+        }
+    }
+}
diff --git a/backend/src/main/java/net/beetechgroup/beetask/usecase/user/signature/ListUserSignaturesUseCase.java b/backend/src/main/java/net/beetechgroup/beetask/usecase/user/signature/ListUserSignaturesUseCase.java
new file mode 100644
index 0000000..3e137f2
--- /dev/null
+++ b/backend/src/main/java/net/beetechgroup/beetask/usecase/user/signature/ListUserSignaturesUseCase.java
@@ -0,0 +1,27 @@
+package net.beetechgroup.beetask.usecase.user.signature;
+
+import net.beetechgroup.beetask.entities.User;
+import net.beetechgroup.beetask.entities.UserSignature;
+import net.beetechgroup.beetask.usecase.exceptions.UserNotFoundException;
+import net.beetechgroup.beetask.usecase.repository.UserRepository;
+import net.beetechgroup.beetask.usecase.repository.UserSignatureRepository;
+
+import java.util.List;
+
+public class ListUserSignaturesUseCase {
+
+    private final UserRepository userRepository;
+    private final UserSignatureRepository userSignatureRepository;
+
+    public ListUserSignaturesUseCase(UserRepository userRepository, UserSignatureRepository userSignatureRepository) {
+        this.userRepository = userRepository;
+        this.userSignatureRepository = userSignatureRepository;
+    }
+
+    public List<UserSignature> execute(String userEmail) {
+        User user = userRepository.findByEmail(userEmail)
+                .orElseThrow(() -> new UserNotFoundException("Usuário não encontrado: " + userEmail));
+
+        return userSignatureRepository.findByUserId(user.getId());
+    }
+}
diff --git a/backend/src/main/java/net/beetechgroup/beetask/usecase/user/signature/SetDefaultUserSignatureUseCase.java b/backend/src/main/java/net/beetechgroup/beetask/usecase/user/signature/SetDefaultUserSignatureUseCase.java
new file mode 100644
index 0000000..104f5e4
--- /dev/null
+++ b/backend/src/main/java/net/beetechgroup/beetask/usecase/user/signature/SetDefaultUserSignatureUseCase.java
@@ -0,0 +1,42 @@
+package net.beetechgroup.beetask.usecase.user.signature;
+
+import net.beetechgroup.beetask.entities.User;
+import net.beetechgroup.beetask.entities.UserSignature;
+import net.beetechgroup.beetask.usecase.exceptions.UserNotFoundException;
+import net.beetechgroup.beetask.usecase.repository.UserRepository;
+import net.beetechgroup.beetask.usecase.repository.UserSignatureRepository;
+import org.jboss.logging.Logger;
+
+import java.time.LocalDateTime;
+
+public class SetDefaultUserSignatureUseCase {
+    private static final Logger LOGGER = Logger.getLogger(SetDefaultUserSignatureUseCase.class);
+
+    private final UserRepository userRepository;
+    private final UserSignatureRepository userSignatureRepository;
+
+    public SetDefaultUserSignatureUseCase(UserRepository userRepository, UserSignatureRepository userSignatureRepository) {
+        this.userRepository = userRepository;
+        this.userSignatureRepository = userSignatureRepository;
+    }
+
+    public UserSignature execute(Long signatureId, String userEmail) {
+        User user = userRepository.findByEmail(userEmail)
+                .orElseThrow(() -> new UserNotFoundException("Usuário não encontrado: " + userEmail));
+
+        UserSignature signature = userSignatureRepository.findSignatureById(signatureId)
+                .orElseThrow(() -> new IllegalArgumentException("Assinatura não encontrada: " + signatureId));
+
+        if (!signature.getUserId().equals(user.getId())) {
+            throw new SecurityException("Você não tem permissão para alterar esta assinatura.");
+        }
+
+        userSignatureRepository.unsetDefaultForUser(user.getId());
+        signature.setDefault(true);
+        signature.setUpdatedAt(LocalDateTime.now());
+        UserSignature saved = userSignatureRepository.save(signature);
+
+        LOGGER.infof("Assinatura %d definida como padrão para usuário %s", signatureId, userEmail);
+        return saved;
+    }
+}
diff --git a/backend/src/main/resources/db/migration/V14__add_user_signatures.sql b/backend/src/main/resources/db/migration/V14__add_user_signatures.sql
new file mode 100644
index 0000000..a64b4fe
--- /dev/null
+++ b/backend/src/main/resources/db/migration/V14__add_user_signatures.sql
@@ -0,0 +1,13 @@
+CREATE TABLE user_signatures (
+    id BIGSERIAL PRIMARY KEY,
+    user_id BIGINT NOT NULL REFERENCES users_entity(id) ON DELETE CASCADE,
+    name VARCHAR(255) NOT NULL,
+    signature_type VARCHAR(50) NOT NULL, -- 'UPLOAD', 'DRAW', 'TEMPLATE'
+    image_url VARCHAR(1024) NOT NULL,
+    storage_key VARCHAR(512),
+    is_default BOOLEAN NOT NULL DEFAULT FALSE,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX idx_user_signatures_user ON user_signatures(user_id);
diff --git a/frontend/index.html b/frontend/index.html
index 629b5c9..00628fb 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -6,7 +6,7 @@
     <link rel="preconnect" href="https://fonts.googleapis.com" />
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
     <link
-      href="https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap"
+      href="https://fonts.googleapis.com/css2?family=Alex+Brush&family=Allura&family=Caveat:wght@600;700&family=Dancing+Script:wght@600;700&family=Great+Vibes&family=Homemade+Apple&family=Pacifico&family=Satisfy&family=JetBrains+Mono:wght@400;500;600&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap"
       rel="stylesheet"
     />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
diff --git a/frontend/src/components/profile/CreateSignatureModal.tsx b/frontend/src/components/profile/CreateSignatureModal.tsx
new file mode 100644
index 0000000..12804c5
--- /dev/null
+++ b/frontend/src/components/profile/CreateSignatureModal.tsx
@@ -0,0 +1,894 @@
+import React, { useState, useRef, useEffect, useCallback } from 'react'
+import {
+  X,
+  Upload,
+  PenTool,
+  Type,
+  Trash2,
+  Undo2,
+  Check,
+  Loader2,
+  AlertCircle,
+  Sparkles,
+  CheckCircle2,
+} from 'lucide-react'
+import { signatureService, type UserSignature } from '../../services/signatureService'
+
+interface CreateSignatureModalProps {
+  isOpen: boolean
+  onClose: () => void
+  onSuccess: (newSignature: UserSignature) => void
+  userName?: string
+  hasExistingSignatures: boolean
+}
+
+type Mode = 'upload' | 'draw' | 'template'
+
+interface FontOption {
+  id: string
+  name: string
+  fontFamily: string
+  description: string
+  previewSize: string
+  canvasFontSize: number
+  yOffsetRatio?: number
+}
+
+const FONT_OPTIONS: FontOption[] = [
+  {
+    id: 'great-vibes',
+    name: 'Great Vibes',
+    fontFamily: "'Great Vibes', cursive",
+    description: 'Clássica e elegante com curvas suaves',
+    previewSize: 'text-3xl',
+    canvasFontSize: 52,
+  },
+  {
+    id: 'dancing-script',
+    name: 'Dancing Script',
+    fontFamily: "'Dancing Script', cursive",
+    description: 'Moderna, fluida e descontraída',
+    previewSize: 'text-2xl',
+    canvasFontSize: 46,
+  },
+  {
+    id: 'alex-brush',
+    name: 'Alex Brush',
+    fontFamily: "'Alex Brush', cursive",
+    description: 'Caligrafia fina com traços delicados',
+    previewSize: 'text-3xl',
+    canvasFontSize: 54,
+  },
+  {
+    id: 'caveat',
+    name: 'Caveat',
+    fontFamily: "'Caveat', cursive",
+    description: 'Natural e espontânea como escrita à mão',
+    previewSize: 'text-2xl',
+    canvasFontSize: 48,
+  },
+  {
+    id: 'satisfy',
+    name: 'Satisfy',
+    fontFamily: "'Satisfy', cursive",
+    description: 'Formal, fluida e harmoniosa',
+    previewSize: 'text-2xl',
+    canvasFontSize: 44,
+  },
+  {
+    id: 'allura',
+    name: 'Allura',
+    fontFamily: "'Allura', cursive",
+    description: 'Sofisticada e estilizada para documentos',
+    previewSize: 'text-3xl',
+    canvasFontSize: 56,
+  },
+  {
+    id: 'homemade-apple',
+    name: 'Homemade Apple',
+    fontFamily: "'Homemade Apple', cursive",
+    description: 'Autêntica e rápida como uma rubrica real',
+    previewSize: 'text-xl',
+    canvasFontSize: 38,
+  },
+  {
+    id: 'pacifico',
+    name: 'Pacifico',
+    fontFamily: "'Pacifico', cursive",
+    description: 'Encorpada com traço uniforme e legível',
+    previewSize: 'text-xl',
+    canvasFontSize: 40,
+  },
+]
+
+const INK_COLORS = [
+  { id: 'black', label: 'Preto Clássico', color: '#0f172a' },
+  { id: 'blue', label: 'Azul Caneta', color: '#1d4ed8' },
+  { id: 'darkblue', label: 'Azul Noturno', color: '#0f2b5c' },
+]
+
+export const CreateSignatureModal: React.FC<CreateSignatureModalProps> = ({
+  isOpen,
+  onClose,
+  onSuccess,
+  userName = '',
+  hasExistingSignatures,
+}) => {
+  const [mode, setMode] = useState<Mode>('draw')
+  const [signatureName, setSignatureName] = useState('')
+  const [isDefault, setIsDefault] = useState(!hasExistingSignatures)
+  const [submitting, setSubmitting] = useState(false)
+  const [error, setError] = useState<string | null>(null)
+
+  // 1. Upload state
+  const [uploadFile, setUploadFile] = useState<File | null>(null)
+  const [uploadPreview, setUploadPreview] = useState<string | null>(null)
+  const fileInputRef = useRef<HTMLInputElement>(null)
+
+  // 2. Draw canvas state
+  const canvasRef = useRef<HTMLCanvasElement>(null)
+  const [isDrawing, setIsDrawing] = useState(false)
+  const [drawColor, setDrawColor] = useState('#0f172a')
+  const [drawLineWidth, setDrawLineWidth] = useState(2.5)
+  const [hasDrawnContent, setHasDrawnContent] = useState(false)
+  const strokesHistoryRef = useRef<ImageData[]>([])
+
+  // 3. Template state
+  const [templateText, setTemplateText] = useState(userName || '')
+  const [selectedFontId, setSelectedFontId] = useState<string>(FONT_OPTIONS[0].id)
+  const [templateColor, setTemplateColor] = useState('#0f172a')
+
+  // Reset or initialize state
+  useEffect(() => {
+    if (isOpen) {
+      setError(null)
+      setMode('draw')
+      setSignatureName('')
+      setIsDefault(!hasExistingSignatures)
+      setUploadFile(null)
+      setUploadPreview(null)
+      setTemplateText(userName || '')
+      setSelectedFontId(FONT_OPTIONS[0].id)
+      setHasDrawnContent(false)
+      strokesHistoryRef.current = []
+
+      // Give DOM time to mount canvas then init
+      setTimeout(initCanvas, 50)
+    }
+  }, [isOpen, userName, hasExistingSignatures])
+
+  // Canvas Initialization & Handlers
+  const initCanvas = useCallback(() => {
+    const canvas = canvasRef.current
+    if (!canvas) return
+    const ctx = canvas.getContext('2d')
+    if (!ctx) return
+
+    // Set high DPI for smooth drawing
+    const dpr = window.devicePixelRatio || 1
+    const rect = canvas.getBoundingClientRect()
+    canvas.width = rect.width * dpr
+    canvas.height = rect.height * dpr
+    ctx.scale(dpr, dpr)
+
+    // Clear canvas
+    ctx.clearRect(0, 0, rect.width, rect.height)
+    strokesHistoryRef.current = []
+    setHasDrawnContent(false)
+  }, [])
+
+  useEffect(() => {
+    if (mode === 'draw') {
+      setTimeout(initCanvas, 30)
+    }
+  }, [mode, initCanvas])
+
+  const saveCanvasState = () => {
+    const canvas = canvasRef.current
+    if (!canvas) return
+    const ctx = canvas.getContext('2d')
+    if (!ctx) return
+    try {
+      const data = ctx.getImageData(0, 0, canvas.width, canvas.height)
+      strokesHistoryRef.current.push(data)
+      setHasDrawnContent(true)
+    } catch {
+      // Ignored
+    }
+  }
+
+  const handlePointerDown = (e: React.PointerEvent<HTMLCanvasElement>) => {
+    const canvas = canvasRef.current
+    if (!canvas) return
+    const ctx = canvas.getContext('2d')
+    if (!ctx) return
+
+    saveCanvasState()
+
+    const rect = canvas.getBoundingClientRect()
+    const x = e.clientX - rect.left
+    const y = e.clientY - rect.top
+
+    ctx.beginPath()
+    ctx.moveTo(x, y)
+    ctx.strokeStyle = drawColor
+    ctx.lineWidth = drawLineWidth
+    ctx.lineCap = 'round'
+    ctx.lineJoin = 'round'
+
+    setIsDrawing(true)
+    canvas.setPointerCapture(e.pointerId)
+  }
+
+  const handlePointerMove = (e: React.PointerEvent<HTMLCanvasElement>) => {
+    if (!isDrawing) return
+    const canvas = canvasRef.current
+    if (!canvas) return
+    const ctx = canvas.getContext('2d')
+    if (!ctx) return
+
+    const rect = canvas.getBoundingClientRect()
+    const x = e.clientX - rect.left
+    const y = e.clientY - rect.top
+
+    ctx.lineTo(x, y)
+    ctx.stroke()
+  }
+
+  const handlePointerUp = (e: React.PointerEvent<HTMLCanvasElement>) => {
+    if (!isDrawing) return
+    setIsDrawing(false)
+    const canvas = canvasRef.current
+    if (canvas) {
+      try {
+        canvas.releasePointerCapture(e.pointerId)
+      } catch {
+        // Ignored
+      }
+    }
+  }
+
+  const handleClearCanvas = () => {
+    const canvas = canvasRef.current
+    if (!canvas) return
+    const ctx = canvas.getContext('2d')
+    if (!ctx) return
+    ctx.clearRect(0, 0, canvas.width, canvas.height)
+    strokesHistoryRef.current = []
+    setHasDrawnContent(false)
+  }
+
+  const handleUndoCanvas = () => {
+    const canvas = canvasRef.current
+    if (!canvas) return
+    const ctx = canvas.getContext('2d')
+    if (!ctx) return
+
+    if (strokesHistoryRef.current.length > 0) {
+      const previous = strokesHistoryRef.current.pop()
+      if (previous) {
+        ctx.putImageData(previous, 0, 0)
+        setHasDrawnContent(strokesHistoryRef.current.length > 0)
+      }
+    } else {
+      handleClearCanvas()
+    }
+  }
+
+  // Upload Handlers
+  const handleFileChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    const file = e.target.files?.[0]
+    if (!file) return
+
+    if (file.size > 5 * 1024 * 1024) {
+      setError('A imagem deve ter no máximo 5 MB.')
+      return
+    }
+
+    if (!file.type.startsWith('image/')) {
+      setError('O arquivo deve ser uma imagem válida (PNG, JPG, WebP).')
+      return
+    }
+
+    setError(null)
+    setUploadFile(file)
+    const reader = new FileReader()
+    reader.onload = () => {
+      setUploadPreview(reader.result as string)
+    }
+    reader.readAsDataURL(file)
+  }
+
+  // Generate PNG Blob from drawn canvas
+  const getDrawnCanvasBlob = (): Promise<Blob> => {
+    return new Promise((resolve, reject) => {
+      const canvas = canvasRef.current
+      if (!canvas) {
+        reject(new Error('Canvas não disponível'))
+        return
+      }
+
+      // Trim canvas bounding box to remove excess empty space
+      const ctx = canvas.getContext('2d')
+      if (!ctx) {
+        reject(new Error('Contexto do Canvas indisponível'))
+        return
+      }
+
+      const width = canvas.width
+      const height = canvas.height
+      const imgData = ctx.getImageData(0, 0, width, height)
+      const data = imgData.data
+
+      let minX = width
+      let minY = height
+      let maxX = 0
+      let maxY = 0
+
+      // Find bounding box of drawn pixels
+      for (let y = 0; y < height; y++) {
+        for (let x = 0; x < width; x++) {
+          const alpha = data[(y * width + x) * 4 + 3]
+          if (alpha > 10) {
+            if (x < minX) minX = x
+            if (x > maxX) maxX = x
+            if (y < minY) minY = y
+            if (y > maxY) maxY = y
+          }
+        }
+      }
+
+      if (maxX <= minX || maxY <= minY) {
+        reject(new Error('Por favor, desenhe sua assinatura antes de salvar.'))
+        return
+      }
+
+      // Add a small padding around the cropped signature
+      const pad = 20
+      minX = Math.max(0, minX - pad)
+      minY = Math.max(0, minY - pad)
+      maxX = Math.min(width, maxX + pad)
+      maxY = Math.min(height, maxY + pad)
+
+      const croppedWidth = maxX - minX
+      const croppedHeight = maxY - minY
+
+      const croppedCanvas = document.createElement('canvas')
+      croppedCanvas.width = croppedWidth
+      croppedCanvas.height = croppedHeight
+      const croppedCtx = croppedCanvas.getContext('2d')
+
+      if (!croppedCtx) {
+        reject(new Error('Falha ao recortar assinatura'))
+        return
+      }
+
+      croppedCtx.drawImage(
+        canvas,
+        minX,
+        minY,
+        croppedWidth,
+        croppedHeight,
+        0,
+        0,
+        croppedWidth,
+        croppedHeight
+      )
+
+      croppedCanvas.toBlob(
+        (blob) => {
+          if (blob) resolve(blob)
+          else reject(new Error('Falha ao gerar imagem da assinatura.'))
+        },
+        'image/png',
+        1.0
+      )
+    })
+  }
+
+  // Generate PNG Blob from cursive template font
+  const getTemplateBlob = async (): Promise<Blob> => {
+    const text = templateText.trim()
+    if (!text) {
+      throw new Error('Informe o nome ou texto para gerar a assinatura.')
+    }
+
+    const selectedFont = FONT_OPTIONS.find((f) => f.id === selectedFontId) || FONT_OPTIONS[0]
+
+    // Ensure fonts are loaded in document
+    if (document.fonts) {
+      try {
+        await document.fonts.load(`bold ${selectedFont.canvasFontSize}px ${selectedFont.name}`)
+        await document.fonts.ready
+      } catch {
+        // Fallback continues
+      }
+    }
+
+    const canvas = document.createElement('canvas')
+    const ctx = canvas.getContext('2d')
+    if (!ctx) throw new Error('Falha ao inicializar gerador de template')
+
+    // Measure text
+    const fontSize = selectedFont.canvasFontSize * 2 // 2x scale for sharp output
+    ctx.font = `bold ${fontSize}px ${selectedFont.fontFamily}`
+    const metrics = ctx.measureText(text)
+
+    const textWidth = Math.ceil(metrics.width)
+    const textHeight = Math.ceil(fontSize * 1.6)
+
+    const padding = 30
+    canvas.width = textWidth + padding * 2
+    canvas.height = textHeight + padding * 2
+
+    // Re-apply font settings after resize
+    ctx.font = `bold ${fontSize}px ${selectedFont.fontFamily}`
+    ctx.fillStyle = templateColor
+    ctx.textBaseline = 'middle'
+    ctx.textAlign = 'center'
+
+    ctx.fillText(text, canvas.width / 2, canvas.height / 2)
+
+    return new Promise((resolve, reject) => {
+      canvas.toBlob(
+        (blob) => {
+          if (blob) resolve(blob)
+          else reject(new Error('Falha ao renderizar assinatura em template.'))
+        },
+        'image/png',
+        1.0
+      )
+    })
+  }
+
+  // Submit Handler
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault()
+    setError(null)
+
+    const defaultName =
+      mode === 'upload'
+        ? 'Assinatura (Upload)'
+        : mode === 'draw'
+        ? 'Assinatura Desenhada'
+        : `Assinatura (${FONT_OPTIONS.find((f) => f.id === selectedFontId)?.name || 'Template'})`
+
+    const finalName = signatureName.trim() || defaultName
+
+    setSubmitting(true)
+
+    try {
+      let imageBlob: Blob | File | null = null
+      let sigType: 'UPLOAD' | 'DRAW' | 'TEMPLATE' = 'UPLOAD'
+
+      if (mode === 'upload') {
+        if (!uploadFile) {
+          throw new Error('Por favor, selecione uma imagem para upload.')
+        }
+        imageBlob = uploadFile
+        sigType = 'UPLOAD'
+      } else if (mode === 'draw') {
+        if (!hasDrawnContent) {
+          throw new Error('Por favor, desenhe sua assinatura no quadro antes de salvar.')
+        }
+        imageBlob = await getDrawnCanvasBlob()
+        sigType = 'DRAW'
+      } else if (mode === 'template') {
+        if (!templateText.trim()) {
+          throw new Error('Digite seu nome para criar a assinatura pelo template.')
+        }
+        imageBlob = await getTemplateBlob()
+        sigType = 'TEMPLATE'
+      }
+
+      if (!imageBlob) {
+        throw new Error('Nenhuma imagem válida foi gerada.')
+      }
+
+      const formData = new FormData()
+      formData.append('file', imageBlob, 'signature.png')
+      formData.append('name', finalName)
+      formData.append('signatureType', sigType)
+      formData.append('isDefault', String(isDefault))
+
+      const created = await signatureService.createSignature(formData)
+      onSuccess(created)
+      onClose()
+    } catch (err: unknown) {
+      const msg = err instanceof Error ? err.message : 'Falha ao salvar assinatura digital.'
+      setError(msg)
+    } finally {
+      setSubmitting(false)
+    }
+  }
+
+  if (!isOpen) return null
+
+  return (
+    <div className="fixed inset-0 z-50 flex items-center justify-center p-3 sm:p-4 bg-black/60 backdrop-blur-xs animate-in fade-in duration-200">
+      <div className="w-full max-w-2xl bg-surface rounded-3xl border border-border-soft shadow-2xl overflow-hidden flex flex-col max-h-[92vh]">
+        {/* Modal Header */}
+        <div className="px-6 py-4 border-b border-border-soft flex items-center justify-between bg-surface-raised/40">
+          <div className="space-y-0.5">
+            <h3 className="text-base font-bold text-foreground flex items-center gap-2">
+              <PenTool className="w-4 h-4 text-brand" />
+              Adicionar Assinatura Digital
+            </h3>
+            <p className="text-xs text-muted">
+              Crie ou importe assinaturas para uso em relatórios e documentos oficiais.
+            </p>
+          </div>
+          <button
+            type="button"
+            onClick={onClose}
+            className="p-1.5 rounded-xl text-muted hover:text-foreground hover:bg-surface-raised transition-colors cursor-pointer"
+          >
+            <X className="w-4 h-4" />
+          </button>
+        </div>
+
+        {/* Modal Tabs */}
+        <div className="px-6 pt-3 pb-2 border-b border-border-soft/60 bg-surface-raised/20">
+          <div className="grid grid-cols-3 gap-2 p-1 rounded-2xl bg-surface-raised border border-border-soft">
+            <button
+              type="button"
+              onClick={() => setMode('draw')}
+              className={`flex items-center justify-center gap-2 py-2 px-3 rounded-xl text-xs font-bold transition-all cursor-pointer ${
+                mode === 'draw'
+                  ? 'bg-brand text-white shadow-xs'
+                  : 'text-muted hover:text-foreground hover:bg-surface-sunken'
+              }`}
+            >
+              <PenTool className="w-3.5 h-3.5" />
+              <span>Desenhar</span>
+            </button>
+
+            <button
+              type="button"
+              onClick={() => setMode('template')}
+              className={`flex items-center justify-center gap-2 py-2 px-3 rounded-xl text-xs font-bold transition-all cursor-pointer ${
+                mode === 'template'
+                  ? 'bg-brand text-white shadow-xs'
+                  : 'text-muted hover:text-foreground hover:bg-surface-sunken'
+              }`}
+            >
+              <Type className="w-3.5 h-3.5" />
+              <span>Fontes / Cursiva</span>
+            </button>
+
+            <button
+              type="button"
+              onClick={() => setMode('upload')}
+              className={`flex items-center justify-center gap-2 py-2 px-3 rounded-xl text-xs font-bold transition-all cursor-pointer ${
+                mode === 'upload'
+                  ? 'bg-brand text-white shadow-xs'
+                  : 'text-muted hover:text-foreground hover:bg-surface-sunken'
+              }`}
+            >
+              <Upload className="w-3.5 h-3.5" />
+              <span>Upload Imagem</span>
+            </button>
+          </div>
+        </div>
+
+        {/* Modal Content Form */}
+        <form onSubmit={handleSubmit} className="flex-1 overflow-y-auto p-6 space-y-5">
+          {error && (
+            <div className="flex items-center gap-2 p-3.5 rounded-2xl bg-rose-500/10 border border-rose-500/20 text-rose-400 text-xs font-semibold">
+              <AlertCircle className="w-4 h-4 shrink-0" />
+              <span>{error}</span>
+            </div>
+          )}
+
+          {/* TAB 1: DRAW CANVAS */}
+          {mode === 'draw' && (
+            <div className="space-y-3">
+              <div className="flex items-center justify-between flex-wrap gap-2">
+                <span className="text-xs font-bold text-foreground">
+                  Desenhe sua assinatura abaixo usando o mouse ou touch:
+                </span>
+
+                <div className="flex items-center gap-2">
+                  {/* Ink color picker */}
+                  <div className="flex items-center gap-1 bg-surface-raised p-1 rounded-xl border border-border-soft">
+                    {INK_COLORS.map((c) => (
+                      <button
+                        key={c.id}
+                        type="button"
+                        onClick={() => setDrawColor(c.color)}
+                        className={`w-5 h-5 rounded-full border transition-transform ${
+                          drawColor === c.color ? 'scale-125 border-brand ring-2 ring-brand/30' : 'border-border-soft'
+                        }`}
+                        style={{ backgroundColor: c.color }}
+                        title={c.label}
+                      />
+                    ))}
+                  </div>
+
+                  {/* Stroke thickness */}
+                  <div className="flex items-center gap-1 bg-surface-raised p-1 rounded-xl border border-border-soft text-[10px] font-semibold text-muted">
+                    {[
+                      { label: 'Fina', width: 1.8 },
+                      { label: 'Média', width: 2.8 },
+                      { label: 'Grossa', width: 4.2 },
+                    ].map((w) => (
+                      <button
+                        key={w.label}
+                        type="button"
+                        onClick={() => setDrawLineWidth(w.width)}
+                        className={`px-2 py-0.5 rounded-lg transition-all cursor-pointer ${
+                          drawLineWidth === w.width
+                            ? 'bg-brand text-white font-bold'
+                            : 'hover:text-foreground'
+                        }`}
+                      >
+                        {w.label}
+                      </button>
+                    ))}
+                  </div>
+
+                  {/* Actions */}
+                  <button
+                    type="button"
+                    onClick={handleUndoCanvas}
+                    title="Desfazer traço"
+                    className="p-1.5 rounded-xl border border-border-soft text-muted hover:text-foreground hover:bg-surface-raised transition-colors cursor-pointer"
+                  >
+                    <Undo2 className="w-3.5 h-3.5" />
+                  </button>
+                  <button
+                    type="button"
+                    onClick={handleClearCanvas}
+                    title="Limpar quadro"
+                    className="p-1.5 rounded-xl border border-border-soft text-rose-400 hover:text-rose-300 hover:bg-rose-500/10 transition-colors cursor-pointer"
+                  >
+                    <Trash2 className="w-3.5 h-3.5" />
+                  </button>
+                </div>
+              </div>
+
+              {/* Drawing Area */}
+              <div className="relative rounded-2xl border-2 border-dashed border-border-soft bg-surface-raised/30 overflow-hidden shadow-inner group">
+                <canvas
+                  ref={canvasRef}
+                  onPointerDown={handlePointerDown}
+                  onPointerMove={handlePointerMove}
+                  onPointerUp={handlePointerUp}
+                  className="w-full h-48 cursor-crosshair touch-none select-none"
+                />
+
+                {/* Baseline Guide */}
+                <div className="absolute left-6 right-6 bottom-10 border-b border-dashed border-border-soft pointer-events-none opacity-60 flex justify-between">
+                  <span className="text-[9px] font-mono text-muted -translate-y-3 select-none">
+                    Linha base de assinatura
+                  </span>
+                  <span className="text-[9px] font-mono text-muted -translate-y-3 select-none">✕</span>
+                </div>
+
+                {!hasDrawnContent && (
+                  <div className="absolute inset-0 flex items-center justify-center pointer-events-none">
+                    <span className="text-xs text-muted/60 font-medium">
+                      Faça seu traço aqui com o cursor ou toque
+                    </span>
+                  </div>
+                )}
+              </div>
+            </div>
+          )}
+
+          {/* TAB 2: TEMPLATE FONTS */}
+          {mode === 'template' && (
+            <div className="space-y-4">
+              <div className="space-y-1.5">
+                <label className="text-xs font-bold text-foreground flex items-center justify-between">
+                  <span>Nome para a Assinatura</span>
+                  <span className="text-[10px] text-muted">
+                    Digite como deseja que seu nome apareça
+                  </span>
+                </label>
+                <input
+                  type="text"
+                  value={templateText}
+                  onChange={(e) => setTemplateText(e.target.value)}
+                  placeholder="Ex: Gabriel Santos Silva"
+                  className="w-full px-3.5 py-2.5 rounded-xl border border-border-soft bg-surface text-sm font-semibold text-foreground focus:outline-hidden focus:border-brand focus:ring-1 focus:ring-brand shadow-xs"
+                />
+              </div>
+
+              {/* Ink Color Selector */}
+              <div className="flex items-center gap-3">
+                <span className="text-xs font-bold text-foreground">Cor da Tinta:</span>
+                <div className="flex items-center gap-2">
+                  {INK_COLORS.map((c) => (
+                    <button
+                      key={c.id}
+                      type="button"
+                      onClick={() => setTemplateColor(c.color)}
+                      className={`flex items-center gap-1.5 px-3 py-1 rounded-xl border text-xs font-semibold cursor-pointer transition-all ${
+                        templateColor === c.color
+                          ? 'border-brand bg-brand/10 text-brand shadow-xs'
+                          : 'border-border-soft text-muted hover:text-foreground'
+                      }`}
+                    >
+                      <span className="w-2.5 h-2.5 rounded-full" style={{ backgroundColor: c.color }} />
+                      <span>{c.label}</span>
+                    </button>
+                  ))}
+                </div>
+              </div>
+
+              {/* Font Options Grid */}
+              <div className="space-y-2">
+                <span className="text-xs font-bold text-foreground block">
+                  Escolha o estilo de caligrafia que mais lhe agrada:
+                </span>
+                <div className="grid grid-cols-1 sm:grid-cols-2 gap-3 max-h-64 overflow-y-auto pr-1">
+                  {FONT_OPTIONS.map((font) => {
+                    const isSelected = selectedFontId === font.id
+                    return (
+                      <div
+                        key={font.id}
+                        onClick={() => setSelectedFontId(font.id)}
+                        className={`p-4 rounded-2xl border cursor-pointer transition-all flex flex-col justify-between gap-3 ${
+                          isSelected
+                            ? 'border-brand bg-brand/10 ring-2 ring-brand/30 shadow-md'
+                            : 'border-border-soft bg-surface-raised/40 hover:border-brand/40 hover:bg-surface-raised'
+                        }`}
+                      >
+                        <div className="flex items-center justify-between">
+                          <span className="text-[11px] font-bold text-foreground">{font.name}</span>
+                          {isSelected ? (
+                            <span className="w-4 h-4 rounded-full bg-brand text-white flex items-center justify-center">
+                              <Check className="w-2.5 h-2.5" />
+                            </span>
+                          ) : (
+                            <span className="text-[10px] text-muted">{font.description}</span>
+                          )}
+                        </div>
+
+                        {/* Signature Preview */}
+                        <div className="py-2 px-3 rounded-xl bg-surface/70 border border-border-soft/60 flex items-center justify-center min-h-[56px] overflow-hidden">
+                          <span
+                            style={{
+                              fontFamily: font.fontFamily,
+                              color: templateColor,
+                            }}
+                            className={`${font.previewSize} truncate select-none leading-none`}
+                          >
+                            {templateText || 'Sua Assinatura'}
+                          </span>
+                        </div>
+                      </div>
+                    )
+                  })}
+                </div>
+              </div>
+            </div>
+          )}
+
+          {/* TAB 3: UPLOAD */}
+          {mode === 'upload' && (
+            <div className="space-y-3">
+              <input
+                ref={fileInputRef}
+                type="file"
+                accept="image/png,image/jpeg,image/webp"
+                onChange={handleFileChange}
+                className="hidden"
+              />
+
+              <div
+                onClick={() => fileInputRef.current?.click()}
+                className={`p-8 rounded-2xl border-2 border-dashed transition-all cursor-pointer flex flex-col items-center justify-center text-center gap-3 ${
+                  uploadPreview
+                    ? 'border-brand/50 bg-brand/5'
+                    : 'border-border-soft hover:border-brand bg-surface-raised/30'
+                }`}
+              >
+                {uploadPreview ? (
+                  <div className="space-y-3 flex flex-col items-center">
+                    <div className="p-3 bg-white/10 dark:bg-black/20 rounded-xl border border-border-soft max-w-sm max-h-36 overflow-hidden flex items-center justify-center shadow-xs">
+                      <img
+                        src={uploadPreview}
+                        alt="Prévia da assinatura"
+                        className="max-h-28 object-contain"
+                      />
+                    </div>
+                    <div className="flex items-center gap-2 text-xs text-brand font-semibold">
+                      <CheckCircle2 className="w-4 h-4" />
+                      <span>{uploadFile?.name}</span>
+                      <span className="text-muted text-[10px]">
+                        ({((uploadFile?.size || 0) / 1024).toFixed(1)} KB)
+                      </span>
+                    </div>
+                    <span className="text-[11px] text-muted hover:underline">
+                      Clique para escolher outro arquivo
+                    </span>
+                  </div>
+                ) : (
+                  <>
+                    <div className="w-12 h-12 rounded-2xl bg-brand/10 text-brand flex items-center justify-center shadow-xs">
+                      <Upload className="w-6 h-6" />
+                    </div>
+                    <div>
+                      <p className="text-xs font-bold text-foreground">
+                        Clique para selecionar uma imagem ou arraste para cá
+                      </p>
+                      <p className="text-[11px] text-muted mt-0.5">
+                        PNG com fundo transparente é recomendado (máx. 5 MB).
+                      </p>
+                    </div>
+                  </>
+                )}
+              </div>
+            </div>
+          )}
+
+          {/* Common Details Fields */}
+          <div className="pt-2 border-t border-border-soft space-y-4">
+            <div className="space-y-1.5">
+              <label className="text-xs font-bold text-foreground flex items-center justify-between">
+                <span>Identificação / Nome da Assinatura</span>
+                <span className="text-[10px] text-muted">Opcional</span>
+              </label>
+              <input
+                type="text"
+                value={signatureName}
+                onChange={(e) => setSignatureName(e.target.value)}
+                placeholder={
+                  mode === 'draw'
+                    ? 'Ex: Assinatura Principal'
+                    : mode === 'template'
+                    ? 'Ex: Rubrica Formal'
+                    : 'Ex: Assinatura Digitalizada'
+                }
+                className="w-full px-3.5 py-2.5 rounded-xl border border-border-soft bg-surface text-xs font-semibold text-foreground focus:outline-hidden focus:border-brand focus:ring-1 focus:ring-brand shadow-xs"
+              />
+            </div>
+
+            <label className="flex items-center gap-2.5 cursor-pointer select-none">
+              <input
+                type="checkbox"
+                checked={isDefault}
+                onChange={(e) => setIsDefault(e.target.checked)}
+                className="w-4 h-4 rounded-md border-border-soft text-brand focus:ring-brand"
+              />
+              <span className="text-xs font-semibold text-foreground">
+                Definir como minha assinatura padrão
+              </span>
+            </label>
+          </div>
+
+          {/* Modal Actions */}
+          <div className="pt-3 border-t border-border-soft flex items-center justify-end gap-3">
+            <button
+              type="button"
+              onClick={onClose}
+              disabled={submitting}
+              className="px-4 py-2 rounded-xl border border-border-soft text-muted hover:text-foreground text-xs font-bold transition-all cursor-pointer disabled:opacity-50"
+            >
+              Cancelar
+            </button>
+            <button
+              type="submit"
+              disabled={submitting}
+              className="flex items-center gap-2 px-5 py-2 rounded-xl bg-brand text-white text-xs font-bold hover:bg-brand-hover shadow-md shadow-brand/20 transition-all cursor-pointer disabled:opacity-60"
+            >
+              {submitting ? (
+                <>
+                  <Loader2 className="w-3.5 h-3.5 animate-spin" />
+                  <span>Salvando Assinatura...</span>
+                </>
+              ) : (
+                <>
+                  <Sparkles className="w-3.5 h-3.5" />
+                  <span>Salvar Assinatura</span>
+                </>
+              )}
+            </button>
+          </div>
+        </form>
+      </div>
+    </div>
+  )
+}
diff --git a/frontend/src/pages/ProfilePage.tsx b/frontend/src/pages/ProfilePage.tsx
index ad9cae0..246afc3 100644
--- a/frontend/src/pages/ProfilePage.tsx
+++ b/frontend/src/pages/ProfilePage.tsx
@@ -14,10 +14,16 @@ import {
   AlertCircle,
   X,
   Check,
+  PenTool,
+  Star,
+  Trash2,
+  Plus,
 } from 'lucide-react'
 import { useAuth } from '../contexts/AuthContext'
 import { taskService } from '../services/taskService'
 import { authService } from '../services/authService'
+import { signatureService, type UserSignature } from '../services/signatureService'
+import { CreateSignatureModal } from '../components/profile/CreateSignatureModal'
 import type { Task } from '../types/task'
 import { calculateTaskTotalSeconds, formatSecondsToHuman, formatSecondsToTimer } from '../lib/timeUtils'
 import { CustomSelect } from '../components/ui/Select'
@@ -59,6 +65,73 @@ export const ProfilePage: React.FC = () => {
   const [goalHours, setGoalHours] = useState<number>(8)
   const [savedSuccess, setSavedSuccess] = useState(false)
 
+  // Signatures state
+  const [signatures, setSignatures] = useState<UserSignature[]>([])
+  const [loadingSignatures, setLoadingSignatures] = useState(true)
+  const [isSignatureModalOpen, setIsSignatureModalOpen] = useState(false)
+  const [signatureActionLoading, setSignatureActionLoading] = useState<number | null>(null)
+  const [signatureSuccessMsg, setSignatureSuccessMsg] = useState<string | null>(null)
+  const [signatureErrorMsg, setSignatureErrorMsg] = useState<string | null>(null)
+
+  const loadSignatures = async () => {
+    try {
+      setLoadingSignatures(true)
+      const data = await signatureService.listSignatures()
+      setSignatures(data || [])
+    } catch (err: unknown) {
+      console.error('Failed to load user signatures', err)
+    } finally {
+      setLoadingSignatures(false)
+    }
+  }
+
+  useEffect(() => {
+    loadSignatures()
+  }, [])
+
+  const handleSetDefaultSignature = async (id: number) => {
+    try {
+      setSignatureActionLoading(id)
+      setSignatureErrorMsg(null)
+      await signatureService.setDefault(id)
+      setSignatures((prev) =>
+        prev.map((s) => ({
+          ...s,
+          isDefault: s.id === id,
+        }))
+      )
+      setSignatureSuccessMsg('Assinatura padrão atualizada!')
+      setTimeout(() => setSignatureSuccessMsg(null), 3000)
+    } catch (err: unknown) {
+      const msg = err instanceof Error ? err.message : 'Falha ao definir assinatura padrão.'
+      setSignatureErrorMsg(msg)
+      setTimeout(() => setSignatureErrorMsg(null), 4000)
+    } finally {
+      setSignatureActionLoading(null)
+    }
+  }
+
+  const handleDeleteSignature = async (id: number) => {
+    if (!window.confirm('Tem certeza que deseja excluir esta assinatura?')) return
+
+    try {
+      setSignatureActionLoading(id)
+      setSignatureErrorMsg(null)
+      await signatureService.deleteSignature(id)
+      setSignatures((prev) => prev.filter((s) => s.id !== id))
+      setSignatureSuccessMsg('Assinatura excluída com sucesso!')
+      setTimeout(() => setSignatureSuccessMsg(null), 3000)
+      // Reload in case another was promoted to default
+      loadSignatures()
+    } catch (err: unknown) {
+      const msg = err instanceof Error ? err.message : 'Falha ao excluir assinatura.'
+      setSignatureErrorMsg(msg)
+      setTimeout(() => setSignatureErrorMsg(null), 4000)
+    } finally {
+      setSignatureActionLoading(null)
+    }
+  }
+
   const handlePhotoSelected = async (e: React.ChangeEvent<HTMLInputElement>) => {
     const file = e.target.files?.[0]
     if (!file) return
@@ -543,6 +616,160 @@ export const ProfilePage: React.FC = () => {
           </form>
         </div>
 
+        {/* Assinaturas Digitais */}
+        <div className="p-6 rounded-3xl border border-border-soft bg-surface-raised/60 backdrop-blur-md shadow-xs space-y-5">
+          <div className="flex flex-col sm:flex-row sm:items-center justify-between gap-3">
+            <div className="flex items-center gap-3">
+              <div className="w-10 h-10 rounded-2xl bg-brand/10 text-brand border border-brand/20 flex items-center justify-center shrink-0">
+                <PenTool className="w-5 h-5" />
+              </div>
+              <div>
+                <h3 className="text-sm font-bold text-foreground flex items-center gap-2">
+                  Minhas Assinaturas Digitais
+                  <span className="px-2 py-0.5 rounded-full text-[10px] font-bold bg-brand/10 text-brand border border-brand/20">
+                    {signatures.length} {signatures.length === 1 ? 'cadastrada' : 'cadastradas'}
+                  </span>
+                </h3>
+                <p className="text-xs text-muted">
+                  Cadastre suas assinaturas (upload, desenho na tela ou fontes cursivas) para autenticação de relatórios e documentos.
+                </p>
+              </div>
+            </div>
+
+            <button
+              type="button"
+              onClick={() => setIsSignatureModalOpen(true)}
+              className="inline-flex items-center gap-1.5 px-4 py-2 rounded-xl bg-brand text-white text-xs font-bold hover:bg-brand-hover shadow-md shadow-brand/20 transition-all cursor-pointer self-start sm:self-auto"
+            >
+              <Plus className="w-3.5 h-3.5" />
+              <span>Nova Assinatura</span>
+            </button>
+          </div>
+
+          {signatureSuccessMsg && (
+            <div className="flex items-center gap-2 p-3 rounded-2xl bg-emerald-500/10 border border-emerald-500/20 text-emerald-600 dark:text-emerald-400 text-xs font-bold animate-in fade-in">
+              <CheckCircle2 className="w-4 h-4 shrink-0" />
+              <span>{signatureSuccessMsg}</span>
+            </div>
+          )}
+
+          {signatureErrorMsg && (
+            <div className="flex items-center gap-2 p-3 rounded-2xl bg-rose-500/10 border border-rose-500/20 text-rose-400 text-xs font-semibold animate-in fade-in">
+              <AlertCircle className="w-4 h-4 shrink-0" />
+              <span>{signatureErrorMsg}</span>
+            </div>
+          )}
+
+          {loadingSignatures ? (
+            <div className="flex items-center justify-center py-8 text-muted gap-2 text-xs rounded-2xl bg-surface/40 border border-border-soft">
+              <Loader2 className="w-4 h-4 animate-spin text-brand" />
+              <span>Carregando assinaturas digitais...</span>
+            </div>
+          ) : signatures.length === 0 ? (
+            <div className="p-8 rounded-2xl border border-dashed border-border-soft bg-surface/30 text-center space-y-3">
+              <div className="w-12 h-12 rounded-2xl bg-surface-sunken border border-border-soft text-muted flex items-center justify-center mx-auto">
+                <PenTool className="w-5 h-5 text-muted" />
+              </div>
+              <div>
+                <p className="text-xs font-bold text-foreground">
+                  Nenhuma assinatura cadastrada ainda
+                </p>
+                <p className="text-[11px] text-muted mt-0.5 max-w-sm mx-auto">
+                  Você pode desenhar com o mouse, escolher modelos de caligrafia cursiva ou fazer upload da sua assinatura escaneada.
+                </p>
+              </div>
+              <button
+                type="button"
+                onClick={() => setIsSignatureModalOpen(true)}
+                className="inline-flex items-center gap-1.5 px-4 py-1.5 rounded-xl bg-brand/10 hover:bg-brand/20 border border-brand/30 text-xs font-bold text-brand transition-all cursor-pointer"
+              >
+                <Plus className="w-3.5 h-3.5" />
+                <span>Adicionar Minha Primeira Assinatura</span>
+              </button>
+            </div>
+          ) : (
+            <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-3.5">
+              {signatures.map((sig) => (
+                <div
+                  key={sig.id}
+                  className={`p-4 rounded-2xl border transition-all flex flex-col justify-between gap-3 bg-surface/80 relative group shadow-xs ${
+                    sig.isDefault
+                      ? 'border-brand/60 ring-2 ring-brand/20 bg-brand/5'
+                      : 'border-border-soft hover:border-brand/40'
+                  }`}
+                >
+                  {/* Top Bar: Title & Badges */}
+                  <div className="flex items-start justify-between gap-2">
+                    <div className="min-w-0">
+                      <h4 className="text-xs font-bold text-foreground truncate" title={sig.name}>
+                        {sig.name}
+                      </h4>
+                      <span className="text-[10px] text-muted font-medium">
+                        {sig.signatureType === 'DRAW'
+                          ? '✍️ Desenhada'
+                          : sig.signatureType === 'TEMPLATE'
+                          ? '✨ Fonte Cursiva'
+                          : '📁 Upload de Imagem'}
+                      </span>
+                    </div>
+
+                    {sig.isDefault && (
+                      <span className="inline-flex items-center gap-1 px-2 py-0.5 rounded-full text-[10px] font-bold bg-amber-500/15 text-amber-700 dark:text-amber-400 border border-amber-500/25 shrink-0">
+                        <Star className="w-3 h-3 fill-amber-500 text-amber-500" />
+                        <span>Padrão</span>
+                      </span>
+                    )}
+                  </div>
+
+                  {/* Visual Signature Preview Box */}
+                  <div className="h-24 px-3 py-2 rounded-xl bg-white/40 dark:bg-black/30 border border-border-soft/60 flex items-center justify-center overflow-hidden">
+                    <img
+                      src={sig.imageUrl}
+                      alt={sig.name}
+                      className="max-h-20 max-w-full object-contain filter drop-shadow-xs"
+                    />
+                  </div>
+
+                  {/* Actions Footer */}
+                  <div className="flex items-center justify-between pt-1 border-t border-border-soft/60 gap-2">
+                    {!sig.isDefault ? (
+                      <button
+                        type="button"
+                        onClick={() => handleSetDefaultSignature(sig.id)}
+                        disabled={signatureActionLoading === sig.id}
+                        className="text-[11px] font-semibold text-brand hover:underline inline-flex items-center gap-1 cursor-pointer disabled:opacity-50"
+                      >
+                        {signatureActionLoading === sig.id ? (
+                          <Loader2 className="w-3 h-3 animate-spin" />
+                        ) : (
+                          <Star className="w-3 h-3" />
+                        )}
+                        <span>Definir como padrão</span>
+                      </button>
+                    ) : (
+                      <span className="text-[10px] text-muted italic">Assinatura ativa</span>
+                    )}
+
+                    <button
+                      type="button"
+                      onClick={() => handleDeleteSignature(sig.id)}
+                      disabled={signatureActionLoading === sig.id}
+                      title="Excluir assinatura"
+                      className="p-1.5 rounded-lg text-rose-400 hover:text-rose-300 hover:bg-rose-500/10 transition-colors cursor-pointer disabled:opacity-50 ml-auto"
+                    >
+                      {signatureActionLoading === sig.id ? (
+                        <Loader2 className="w-3.5 h-3.5 animate-spin" />
+                      ) : (
+                        <Trash2 className="w-3.5 h-3.5" />
+                      )}
+                    </button>
+                  </div>
+                </div>
+              ))}
+            </div>
+          )}
+        </div>
+
         {/* My Workspaces */}
         <div>
           <div className="flex items-center justify-between mb-3">
@@ -599,6 +826,24 @@ export const ProfilePage: React.FC = () => {
           </div>
         </div>
       </div>
+
+      {/* Create Signature Modal */}
+      <CreateSignatureModal
+        isOpen={isSignatureModalOpen}
+        onClose={() => setIsSignatureModalOpen(false)}
+        onSuccess={(newSig) => {
+          setSignatures((prev) => {
+            if (newSig.isDefault) {
+              return [newSig, ...prev.map((s) => ({ ...s, isDefault: false }))]
+            }
+            return [...prev, newSig]
+          })
+          setSignatureSuccessMsg('Assinatura adicionada com sucesso!')
+          setTimeout(() => setSignatureSuccessMsg(null), 3000)
+        }}
+        userName={user.name || ''}
+        hasExistingSignatures={signatures.length > 0}
+      />
     </div>
   )
 }
diff --git a/frontend/src/services/signatureService.ts b/frontend/src/services/signatureService.ts
new file mode 100644
index 0000000..d4da5d4
--- /dev/null
+++ b/frontend/src/services/signatureService.ts
@@ -0,0 +1,35 @@
+import { apiFetch } from '../lib/api'
+
+export type UserSignature = {
+  id: number
+  name: string
+  signatureType: 'UPLOAD' | 'DRAW' | 'TEMPLATE'
+  imageUrl: string
+  isDefault: boolean
+  createdAt: string
+}
+
+export const signatureService = {
+  async listSignatures(): Promise<UserSignature[]> {
+    return apiFetch<UserSignature[]>('/auth/profile/signatures')
+  },
+
+  async createSignature(formData: FormData): Promise<UserSignature> {
+    return apiFetch<UserSignature>('/auth/profile/signatures', {
+      method: 'POST',
+      body: formData,
+    })
+  },
+
+  async setDefault(id: number): Promise<UserSignature> {
+    return apiFetch<UserSignature>(`/auth/profile/signatures/${id}/default`, {
+      method: 'PUT',
+    })
+  },
+
+  async deleteSignature(id: number): Promise<void> {
+    return apiFetch<void>(`/auth/profile/signatures/${id}`, {
+      method: 'DELETE',
+    })
+  },
+}