diff --git a/src/pages/Index.tsx b/src/pages/Index.tsx
index c5819bf..43f17bd 100644
--- a/src/pages/Index.tsx
+++ b/src/pages/Index.tsx
@@ -7,6 +7,28 @@ import { toast } from 'sonner';
 import { getSupportedExtension, convertToGLB, ACCEPTED_EXTENSIONS } from '@/lib/convertToGLB';
 import { convertIFCtoGLB } from '@/lib/convertIFC';
 
+/**
+ * Normaliza URLs comuns para apontar ao binário direto.
+ * - Dropbox: força dl=1
+ * - OneDrive (1drv.ms / onedrive.live.com): força download=1
+ */
+function normalizeCloudUrl(input: string): string {
+  try {
+    const u = new URL(input);
+    if (/(^|\.)dropbox\.com$/.test(u.hostname)) {
+      u.searchParams.set('dl', '1');
+      return u.toString();
+    }
+    if (/(^|\.)1drv\.ms$|onedrive\.live\.com$/.test(u.hostname)) {
+      u.searchParams.set('download', '1');
+      return u.toString();
+    }
+    return input;
+  } catch {
+    return input;
+  }
+}
+
 const Index = () => {
   const navigate = useNavigate();
   const fileInputRef = useRef<HTMLInputElement>(null);