diff --git a/backend/src/utils/fileSecurityUtils.js b/backend/src/utils/fileSecurityUtils.js
index 39e59b70..28155b33 100644
--- a/backend/src/utils/fileSecurityUtils.js
+++ b/backend/src/utils/fileSecurityUtils.js
@@ -79,6 +79,22 @@ const ALLOWED_IMAGE_TYPES = {
     extensions: ['.svg'],
     // SVG files are XML-based text files, so we skip magic number validation
     magicNumbers: null
+  },
+  // HEIC/HEIF (iPhone). ISO-BMFF container: bytes 4-7 are the "ftyp" box marker,
+  // present in every HEIF/HEIC file (single entry — the magic check is `.every`,
+  // so alternatives can't be listed as separate entries). Sharp's libvips
+  // decodes these; extension + MIME are already gated by validateFileType.
+  'image/heic': {
+    extensions: ['.heic'],
+    magicNumbers: [
+      { offset: 4, bytes: [0x66, 0x74, 0x79, 0x70] } // "ftyp"
+    ]
+  },
+  'image/heif': {
+    extensions: ['.heif'],
+    magicNumbers: [
+      { offset: 4, bytes: [0x66, 0x74, 0x79, 0x70] } // "ftyp"
+    ]
   }
 };
 
diff --git a/frontend/src/components/admin/PhotoUpload.tsx b/frontend/src/components/admin/PhotoUpload.tsx
index 7d3f0ea1..b3a7d0a1 100644
--- a/frontend/src/components/admin/PhotoUpload.tsx
+++ b/frontend/src/components/admin/PhotoUpload.tsx
@@ -8,7 +8,7 @@ import { useQuery } from '@tanstack/react-query';
 import { categoriesService } from '../../services/categories.service';
 import { settingsService } from '../../services/settings.service';
 import { useTranslation } from 'react-i18next';
-import { extensionsToMimeTypes, extensionsToAcceptString } from '../../utils/fileTypes';
+import { extensionsToMimeTypes, extensionsToAcceptString, extensionsToLabel } from '../../utils/fileTypes';
 import { useUploadProgress } from '../../hooks/useUploadProgress';
 
 interface PhotoUploadProps {
@@ -118,6 +118,15 @@ export const PhotoUpload: React.FC<PhotoUploadProps> = ({ eventId, onUploadCompl
     [settings?.general_allowed_file_types]
   );
 
+  const formatsLabel = useMemo(
+    () => extensionsToLabel(settings?.general_allowed_file_types),
+    [settings?.general_allowed_file_types]
+  );
+
+  const maxFileSizeMb = Number.isFinite(Number(settings?.general_max_file_size_mb))
+    ? Number(settings?.general_max_file_size_mb)
+    : 50;
+
   const remainingSlots = Math.max(maxFilesPerUpload - selectedFiles.length, 0);
   const [isDragOver, setIsDragOver] = useState(false);
 
@@ -511,7 +520,7 @@ export const PhotoUpload: React.FC<PhotoUploadProps> = ({ eventId, onUploadCompl
           {t('upload.clickToUpload')}
         </p>
         <p className="text-sm text-neutral-500 dark:text-neutral-400">
-          {t('upload.fileRequirements', { limit: maxFilesPerUpload })}
+          {t('upload.fileRequirements', { formats: formatsLabel, limit: maxFilesPerUpload, sizeLimit: maxFileSizeMb })}
         </p>
         <p
           className={clsx(