diff --git a/django_translatable_fields/serializers.py b/django_translatable_fields/serializers.py
index 745dd9b..6e1183d 100644
--- a/django_translatable_fields/serializers.py
+++ b/django_translatable_fields/serializers.py
@@ -322,12 +322,28 @@ class TranslatableField(serializers.Field):
             if isinstance(data, dict):
                 return data
             else:
+                # Try to parse as JSON dict (e.g. from multipart form data)
+                if isinstance(data, str):
+                    try:
+                        parsed = json.loads(data)
+                        if isinstance(parsed, dict):
+                            return parsed
+                    except (json.JSONDecodeError, ValueError):
+                        pass
                 return {language: str(data)}
         else:
             # No language: expect full translation dict or assume English
             if isinstance(data, dict):
                 return data
             else:
+                # Try to parse as JSON dict (e.g. from multipart form data)
+                if isinstance(data, str):
+                    try:
+                        parsed = json.loads(data)
+                        if isinstance(parsed, dict):
+                            return parsed
+                    except (json.JSONDecodeError, ValueError):
+                        pass
                 return {'en': str(data)}