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CORS Header Generator - Create Safe API CORS Headers

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Free Online CORS Header Generator

Use this free CORS Header Generator to get quick, accurate results without creating an account. The tool is designed for everyday calculations where you want the answer immediately and a clean summary you can copy.

Everything runs in your browser, so the workflow stays fast: enter the values, review the result, and keep working. The interface is intentionally simple so it works well on mobile and desktop.

Use the detailed result rows to verify the calculation and avoid common mistakes before using the output in documents, projects, planning notes, or client conversations.

Key Features

Allowed origin input
Allowed methods input
Allowed headers input
Credentials toggle
Preflight max-age
Wildcard safety warning

When to Use This CORS Header Generator

Quick daily calculations
Preparing clean numbers for notes or documents
Checking values before sharing with a teammate or client
Using a no-login browser-based utility on mobile or desktop

How to Use the CORS Header Generator

  1. 1. Enter the allowed origin.
  2. 2. Set allowed methods and headers.
  3. 3. Choose whether credentials are allowed.
  4. 4. Review any wildcard warning.
  5. 5. Copy the CORS headers into your server config.

CORS Header Generator FAQ

Is this CORS Header Generator free?

Yes. The CORS Header Generator is free to use and does not require login.

Does this tool upload my data?

No. The calculation runs in your browser for a fast and private workflow.

Can I copy the result?

Yes. You can copy the result summary for notes, messages, documents, or later reference.

Does it work on mobile?

Yes. The tool is designed to work on mobile, tablet, and desktop screens.

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