@@ -51,7 +51,8 @@ STACK_SVIX_SERVER_URL=# For prod, leave it empty. For local development, use `ht
 STACK_SVIX_API_KEY=# enter the API key for the Svix webhook service here. Use `eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpYXQiOjE2NTUxNDA2MzksImV4cCI6MTk3MDUwMDYzOSwibmJmIjoxNjU1MTQwNjM5LCJpc3MiOiJzdml4LXNlcnZlciIsInN1YiI6Im9yZ18yM3JiOFlkR3FNVDBxSXpwZ0d3ZFhmSGlyTXUifQ.En8w77ZJWbd0qrMlHHupHUB-4cx17RfzFykseg95SUk` for local development
 
 # S3
-STACK_S3_ENDPOINT=# S3 endpoint URL (e.g., 'https://s3.amazonaws.com' for AWS or custom endpoint for S3-compatible services)
+STACK_S3_PUBLIC_ENDPOINT=# publicly accessible endpoint
+STACK_S3_ENDPOINT=# S3 API endpoint URL (e.g., 'https://s3.amazonaws.com' for AWS or custom endpoint for S3-compatible services)
 STACK_S3_REGION=
 STACK_S3_ACCESS_KEY_ID=
 STACK_S3_SECRET_ACCESS_KEY=
 
@@ -5,6 +5,7 @@ import { ImageProcessingError, parseBase64Image } from "./lib/images";
 
 const S3_REGION = getEnvVariable("STACK_S3_REGION", "");
 const S3_ENDPOINT = getEnvVariable("STACK_S3_ENDPOINT", "");
+const S3_PUBLIC_ENDPOINT = getEnvVariable("STACK_S3_PUBLIC_ENDPOINT", S3_ENDPOINT);
 const S3_BUCKET = getEnvVariable("STACK_S3_BUCKET", "");
 const S3_ACCESS_KEY_ID = getEnvVariable("STACK_S3_ACCESS_KEY_ID", "");
 const S3_SECRET_ACCESS_KEY = getEnvVariable("STACK_S3_SECRET_ACCESS_KEY", "");
@@ -26,7 +27,7 @@ const s3Client = HAS_S3 ? new S3Client({
 }) : undefined;
 
 export function getS3PublicUrl(key: string): string {
-  return `${S3_ENDPOINT}/${S3_BUCKET}/${key}`;
+  return `${S3_PUBLIC_ENDPOINT}/${S3_BUCKET}/${key}`;
 }
 
 async function uploadBase64Image({