diff --git a/next.config.ts b/next.config.ts
index 10eb7a6..a113923 100644
--- a/next.config.ts
+++ b/next.config.ts
@@ -4,67 +4,44 @@ const nextConfig: NextConfig = {
   experimental: {
     optimizePackageImports: ["lucide-react", "@radix-ui/react-icons"],
     serverActions: {
-      // Job files bucket caps individual files at 30MB; raise overall body
-      // limit to allow batch uploads.
-      bodySizeLimit: "100mb",
+      // Job files bucket caps individual files at 30MB; allow batch uploads
+      // (multipart overhead + ~16 files of 30MB worst case).
+      bodySizeLimit: "500mb",
     },
+    // Next 16 renamed `middlewareClientMaxBodySize` to `proxyClientMaxBodySize`
+    // (middleware.ts → proxy.ts). Default 10MB gates every body that flows
+    // through our auth proxy — without this override multipart uploads exceed
+    // the cap and the parser dies with "Unexpected end of form".
+    proxyClientMaxBodySize: "500mb",
   },
   turbopack: {},
 
-  // Image optimization
   images: {
     remotePatterns: [
-      {
-        protocol: 'https',
-        hostname: 'ui.shadcn.com',
-      },
-      {
-        protocol: 'https',
-        hostname: 'images.unsplash.com',
-      },
+      { protocol: "https", hostname: "ui.shadcn.com" },
+      { protocol: "https", hostname: "images.unsplash.com" },
     ],
-    formats: ['image/webp', 'image/avif'],
+    formats: ["image/webp", "image/avif"],
   },
 
-  // Headers for better security and performance
   async headers() {
     return [
       {
-        source: '/(.*)',
+        source: "/(.*)",
         headers: [
-          {
-            key: 'X-Frame-Options',
-            value: 'DENY',
-          },
-          {
-            key: 'X-Content-Type-Options',
-            value: 'nosniff',
-          },
-          {
-            key: 'Referrer-Policy',
-            value: 'origin-when-cross-origin',
-          },
+          { key: "X-Frame-Options", value: "DENY" },
+          { key: "X-Content-Type-Options", value: "nosniff" },
+          { key: "Referrer-Policy", value: "origin-when-cross-origin" },
         ],
       },
     ];
   },
 
-  // Redirects for better SEO
   async redirects() {
     return [
-      {
-        source: '/home',
-        destination: '/dashboard',
-        permanent: true,
-      },
+      { source: "/home", destination: "/dashboard", permanent: true },
     ];
   },
 };
 
-// Next 16 caps middleware-passed request bodies at 10MB by default. Our auth
-// middleware sees every request including job-file uploads — without this
-// override, multipart uploads larger than 10MB return "Unexpected end of
-// form". The key isn't in NextConfig's TS types yet (Next 16.1).
-(nextConfig as NextConfig & { middlewareClientMaxBodySize?: string }).middlewareClientMaxBodySize = "100mb";
-
 export default nextConfig;
diff --git a/src/app/(dashboard)/jobs/[jobId]/components/job-files-panel.tsx b/src/app/(dashboard)/jobs/[jobId]/components/job-files-panel.tsx
index 01e98d0..933eebe 100644
--- a/src/app/(dashboard)/jobs/[jobId]/components/job-files-panel.tsx
+++ b/src/app/(dashboard)/jobs/[jobId]/components/job-files-panel.tsx
@@ -63,6 +63,9 @@ export function JobFilesPanel({
   );
 }
 
+const MAX_FILE_BYTES = 30 * 1024 * 1024;
+const MAX_BATCH_BYTES = 400 * 1024 * 1024; // leaves headroom under the 500MB proxy cap
+
 function UploadForm({ jobId }: { jobId: string }) {
   const [state, action, pending] = useActionState(
     uploadJobFilesAction,
@@ -82,6 +85,11 @@ function UploadForm({ jobId }: { jobId: string }) {
     }
   }, [state]);
 
+  const totalBytes = selected.reduce((s, f) => s + f.size, 0);
+  const overSize = selected.find((f) => f.size > MAX_FILE_BYTES);
+  const overBatch = totalBytes > MAX_BATCH_BYTES;
+  const blocked = Boolean(overSize) || overBatch;
+
   return (
     <form
       ref={formRef}
@@ -111,11 +119,25 @@ function UploadForm({ jobId }: { jobId: string }) {
         Dosya seç
       </Button>
       <span className="text-muted-foreground text-xs flex-1">
-        {selected.length > 0
-          ? `${selected.length} dosya seçildi (${formatSize(selected.reduce((s, f) => s + f.size, 0))})`
-          : "Tarama (STL/OBJ), görsel veya PDF — max 30MB / dosya"}
+        {selected.length > 0 ? (
+          overSize ? (
+            <span className="text-destructive">
+              {overSize.name} 30MB'tan büyük (her dosya maksimum 30MB).
+            </span>
+          ) : overBatch ? (
+            <span className="text-destructive">
+              Toplam {formatSize(totalBytes)} — 400MB sınırını aşıyor. Daha az dosya seçin.
+            </span>
+          ) : (
+            <>
+              {selected.length} dosya seçildi ({formatSize(totalBytes)})
+            </>
+          )
+        ) : (
+          "Tarama (STL/OBJ), görsel veya PDF — max 30MB / dosya"
+        )}
       </span>
-      <Button type="submit" size="sm" disabled={pending || selected.length === 0}>
+      <Button type="submit" size="sm" disabled={pending || selected.length === 0 || blocked}>
         {pending ? (
           <>
             <Loader2 className="size-4 animate-spin" />