diff --git a/internal/user/form.go b/internal/user/form.go
index 395897e..80c23e3 100644
--- a/internal/user/form.go
+++ b/internal/user/form.go
@@ -1,6 +1,10 @@
 package user
 
-import "tm/pkg/response"
+import (
+	"encoding/json"
+
+	"tm/pkg/response"
+)
 
 // User Registration DTOs
 
@@ -27,6 +31,46 @@ type UpdateUserForm struct {
 	Position     *string `json:"position" valid:"optional,length(2|100)" example:"Lead"`                     // Updated position
 	Phone        *string `json:"phone" valid:"optional,length(10|20)" example:"+18289784438"`                // Updated phone number
 	ProfileImage *string `json:"profile_image" valid:"optional,url" example:""`                              // Updated profile image URL
+	profileImageSet bool
+}
+
+func unmarshalProfileImageField(data []byte, profileImage **string, profileImageSet *bool) ([]byte, error) {
+	var raw map[string]json.RawMessage
+	if err := json.Unmarshal(data, &raw); err != nil {
+		return nil, err
+	}
+
+	profileImageRaw, ok := raw["profile_image"]
+	if ok {
+		*profileImageSet = true
+		if string(profileImageRaw) == "null" {
+			*profileImage = nil
+		} else {
+			var image string
+			if err := json.Unmarshal(profileImageRaw, &image); err != nil {
+				return nil, err
+			}
+			*profileImage = &image
+		}
+		delete(raw, "profile_image")
+	}
+
+	return json.Marshal(raw)
+}
+
+// UnmarshalJSON distinguishes omitted profile_image from explicit null to allow clearing the image.
+func (f *UpdateUserForm) UnmarshalJSON(data []byte) error {
+	rest, err := unmarshalProfileImageField(data, &f.ProfileImage, &f.profileImageSet)
+	if err != nil {
+		return err
+	}
+
+	type alias UpdateUserForm
+	return json.Unmarshal(rest, (*alias)(f))
+}
+
+func (f *UpdateUserForm) isProfileImageSet() bool {
+	return f.profileImageSet
 }
 
 // User Authentication DTOs
@@ -51,11 +95,27 @@ type ChangePasswordForm struct {
 
 // UpdateProfileForm represents the data for updating user profile information
 type UpdateProfileForm struct {
-	FullName     *string `json:"full_name,omitempty" valid:"optional,length(2|100)" example:"Admin User"`              // Updated full name
-	Department   *string `json:"department,omitempty" valid:"optional,length(2|100)" example:"Information Technology"` // Updated department
-	Position     *string `json:"position,omitempty" valid:"optional,length(2|100)" example:"Lead"`                     // Updated position
-	Phone        *string `json:"phone,omitempty" valid:"optional,length(10|20)" example:"+18289784438"`                // Updated phone number
-	ProfileImage *string `json:"profile_image,omitempty" valid:"optional,url" example:""`                              // Updated profile image URL
+	FullName        *string `json:"full_name,omitempty" valid:"optional,length(2|100)" example:"Admin User"`              // Updated full name
+	Department      *string `json:"department,omitempty" valid:"optional,length(2|100)" example:"Information Technology"` // Updated department
+	Position        *string `json:"position,omitempty" valid:"optional,length(2|100)" example:"Lead"`                       // Updated position
+	Phone           *string `json:"phone,omitempty" valid:"optional,length(10|20)" example:"+18289784438"`                  // Updated phone number
+	ProfileImage    *string `json:"profile_image,omitempty" valid:"optional,url" example:""`                                // Updated profile image URL
+	profileImageSet bool
+}
+
+// UnmarshalJSON distinguishes omitted profile_image from explicit null to allow clearing the image.
+func (f *UpdateProfileForm) UnmarshalJSON(data []byte) error {
+	rest, err := unmarshalProfileImageField(data, &f.ProfileImage, &f.profileImageSet)
+	if err != nil {
+		return err
+	}
+
+	type alias UpdateProfileForm
+	return json.Unmarshal(rest, (*alias)(f))
+}
+
+func (f *UpdateProfileForm) isProfileImageSet() bool {
+	return f.profileImageSet
 }
 
 // ResetPasswordForm represents the email address for password reset
diff --git a/internal/user/form_test.go b/internal/user/form_test.go
new file mode 100644
index 0000000..ecc3a84
--- /dev/null
+++ b/internal/user/form_test.go
@@ -0,0 +1,47 @@
+package user
+
+import (
+	"encoding/json"
+	"testing"
+)
+
+func TestUpdateUserForm_UnmarshalJSON_ProfileImage(t *testing.T) {
+	t.Run("omitted profile_image is not treated as an update", func(t *testing.T) {
+		var form UpdateUserForm
+		err := json.Unmarshal([]byte(`{"full_name":"Jane Doe"}`), &form)
+		if err != nil {
+			t.Fatalf("unmarshal failed: %v", err)
+		}
+		if form.isProfileImageSet() {
+			t.Fatal("expected profile image to be unset when omitted")
+		}
+	})
+
+	t.Run("null profile_image clears the image", func(t *testing.T) {
+		var form UpdateUserForm
+		err := json.Unmarshal([]byte(`{"profile_image":null}`), &form)
+		if err != nil {
+			t.Fatalf("unmarshal failed: %v", err)
+		}
+		if !form.isProfileImageSet() {
+			t.Fatal("expected profile image to be marked as set")
+		}
+		if form.ProfileImage != nil {
+			t.Fatalf("expected nil profile image, got %#v", form.ProfileImage)
+		}
+	})
+
+	t.Run("profile image url is preserved", func(t *testing.T) {
+		var form UpdateUserForm
+		err := json.Unmarshal([]byte(`{"profile_image":"https://example.com/avatar.png"}`), &form)
+		if err != nil {
+			t.Fatalf("unmarshal failed: %v", err)
+		}
+		if !form.isProfileImageSet() {
+			t.Fatal("expected profile image to be marked as set")
+		}
+		if form.ProfileImage == nil || *form.ProfileImage != "https://example.com/avatar.png" {
+			t.Fatalf("unexpected profile image: %#v", form.ProfileImage)
+		}
+	})
+}
diff --git a/internal/user/service.go b/internal/user/service.go
index b852df9..e3d3b92 100644
--- a/internal/user/service.go
+++ b/internal/user/service.go
@@ -204,7 +204,7 @@ func (s *userService) Update(ctx context.Context, id string, form *UpdateUserFor
 		user.Phone = form.Phone
 	}
 
-	if form.ProfileImage != nil {
+	if form.isProfileImageSet() {
 		user.ProfileImage = form.ProfileImage
 	}
 
@@ -601,7 +601,7 @@ func (s *userService) UpdateProfile(ctx context.Context, userID string, form *Up
 		}
 		user.Phone = form.Phone
 	}
-	if form.ProfileImage != nil {
+	if form.isProfileImageSet() {
 		user.ProfileImage = form.ProfileImage
 	}