diff --git a/src/lib/s3.ts b/src/lib/s3.ts
index 238de47..92caa39 100644
--- a/src/lib/s3.ts
+++ b/src/lib/s3.ts
@@ -14,6 +14,8 @@ export const s3 = new S3Client({
 const BUCKET = process.env.S3_BUCKET!;
 
 export function getPublicUrl(key: string): string {
+  const cdn = process.env.S3_CDN_URL;
+  if (cdn) return `${cdn}/${key}`;
   return `${process.env.S3_ENDPOINT}/${BUCKET}/${key}`;
 }