AWS S3 CORS Generator — Build, Audit, and Export S3 CORS Policies
Configure allowed origins/methods/headers and generate the S3 bucket CORS JSON policy
How to Use AWS S3 CORS Generator — Build, Audit, and Export S3 CORS Policies
How to Use the AWS S3 CORS Generator
Step 1: Set the Bucket Name
Enter your S3 bucket name — it is only used to build the ready-to-run AWS CLI command shown below the JSON output.
Step 2: Configure a CORS Rule
For each rule, enter the allowed origins (comma-separated, e.g. https://example.com), toggle the allowed HTTP methods (GET, PUT, POST, DELETE, HEAD), and optionally set allowed headers, expose headers, and a max-age in seconds.
Step 3: Add More Rules if Needed
Click "Add Rule" to create additional rules — useful when different origins need different methods or headers, such as separating local development from production.
Step 4: Copy the JSON and Apply It
Copy the generated cors.json, save it to a file, then run the AWS CLI command shown (aws s3api put-bucket-cors --bucket your-bucket --cors-configuration file://cors.json) to apply it to your bucket.
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