diff --git a/backend/app/api/media.py b/backend/app/api/media.py
index 6222318..1eb54e1 100644
--- a/backend/app/api/media.py
+++ b/backend/app/api/media.py
@@ -12,12 +12,13 @@ async def upload_media(
     file: UploadFile = File(...),
     context: str = Query(default="note", pattern="^(product|note|attachment)$"),
 ):
-    if file.content_type in ALLOWED_IMAGE_TYPES:
+    content_type = (file.content_type or "").lower()
+    if content_type in ALLOWED_IMAGE_TYPES:
         result = await save_image(file, context=context)
-    elif file.content_type in ALLOWED_AUDIO_TYPES:
+    elif content_type in ALLOWED_AUDIO_TYPES:
         result = await save_audio(file)
     else:
-        raise HTTPException(status_code=400, detail=f"Type de fichier non supporté : {file.content_type}")
+        raise HTTPException(status_code=400, detail=f"Type de fichier non supporté : {content_type}")
 
     return MediaUploadResponse(**result)
 
diff --git a/backend/app/services/media.py b/backend/app/services/media.py
index 35fa5b7..4872e7b 100644
--- a/backend/app/services/media.py
+++ b/backend/app/services/media.py
@@ -9,9 +9,14 @@ from app.core.config import settings
 
 UPLOAD_DIR: Path = settings.upload_path
 
-ALLOWED_IMAGE_TYPES = {"image/jpeg", "image/png", "image/webp", "image/svg+xml"}
+ALLOWED_IMAGE_TYPES = {
+    "image/jpeg", "image/jpg", "image/png", "image/webp", "image/svg+xml",
+    "image/heic", "image/heif",
+}
 ALLOWED_AUDIO_TYPES = {"audio/webm", "audio/mp4"}
 
+MAX_ORIG_SIZE = (500, 500)
+
 THUMBNAIL_SIZES = {
     "product": (150, 150),
     "note": (300, 300),
@@ -20,17 +25,18 @@ THUMBNAIL_SIZES = {
 
 
 async def save_image(file: UploadFile, context: str = "note") -> dict:
-    if file.content_type not in ALLOWED_IMAGE_TYPES:
-        raise HTTPException(status_code=400, detail=f"Format non supporté : {file.content_type}")
+    content_type = (file.content_type or "").lower()
+    if content_type not in ALLOWED_IMAGE_TYPES:
+        raise HTTPException(status_code=400, detail=f"Format non supporté : {content_type}")
 
     file_id = str(uuid.uuid4())
     content = await file.read()
 
     orig_dir = UPLOAD_DIR / "images" / "originals"
     orig_dir.mkdir(parents=True, exist_ok=True)
-    orig_path = orig_dir / f"{file_id}.webp"
 
-    if file.content_type == "image/svg+xml":
+    if content_type == "image/svg+xml":
+        orig_path = orig_dir / f"{file_id}.svg"
         orig_path.write_bytes(content)
         return {
             "file_id": file_id,
@@ -39,16 +45,20 @@ async def save_image(file: UploadFile, context: str = "note") -> dict:
             "file_type": "image",
         }
 
+    orig_path = orig_dir / f"{file_id}.webp"
     img = Image.open(io.BytesIO(content)).convert("RGB")
+
+    # Redimensionne l'original à 500×500 max en conservant l'aspect ratio
+    img.thumbnail(MAX_ORIG_SIZE, Image.LANCZOS)
     img.save(orig_path, "WEBP", quality=85)
 
     thumb_dir = UPLOAD_DIR / "images" / "thumbnails"
     thumb_dir.mkdir(parents=True, exist_ok=True)
     thumb_path = thumb_dir / f"{file_id}_thumb.webp"
 
-    size = THUMBNAIL_SIZES.get(context, (300, 300))
-    img_thumb = Image.open(io.BytesIO(content)).convert("RGB")
-    img_thumb.thumbnail(size, Image.LANCZOS)
+    thumb_size = THUMBNAIL_SIZES.get(context, (300, 300))
+    img_thumb = img.copy()
+    img_thumb.thumbnail(thumb_size, Image.LANCZOS)
     img_thumb.save(thumb_path, "WEBP", quality=80)
 
     return {
diff --git a/frontend/nginx.conf b/frontend/nginx.conf
index 3bffdda..93f5204 100644
--- a/frontend/nginx.conf
+++ b/frontend/nginx.conf
@@ -4,6 +4,8 @@ server {
     root /usr/share/nginx/html;
     index index.html;
 
+    client_max_body_size 15m;
+
     gzip on;
     gzip_types text/plain text/css application/json application/javascript text/xml application/xml image/svg+xml;