CORS Header Generator
CORS Header Generator is a free online Web Tools tool that generate correct CORS headers and preflight handling for nginx, Express, Apache, PHP or a Cloudflare Worker instantly in your browser. Paste your data, adjust the options and get the result in real time — no installation, no sign-up, and nothing is ever uploaded to a server.
How to use: CORS Header Generator →
Description
Generate correct CORS headers and preflight handling for nginx, Express, Apache, PHP or a Cloudflare Worker.
- Because everything is computed client-side, CORS Header Generator is safe to use with sensitive data such as API keys, tokens or private logs.
How to use
Using CORS Header Generator takes three steps:
- Paste your data into the input box (or load the example).
- Configure the options to match your target format or scenario.
- Copy, download or inspect the output — it updates live as you type.
Use cases
Common situations where CORS Header Generator helps:
- Generate correct CORS headers and preflight handling for nginx, Express, Apache, PHP or a Cloudflare Worker.
- Because everything is computed client-side, CORS Header Generator is safe to use with sensitive data such as API keys, tokens or private logs.
FAQ
What is CORS Header Generator?
CORS Header Generator generate correct CORS headers and preflight handling for nginx, Express, Apache, PHP or a Cloudflare Worker. It runs entirely in your browser, so your data stays private.
Is CORS Header Generator free to use?
Yes. CORS Header Generator is free, unlimited and works without registration or installation.
Does my data get uploaded?
No. All processing happens locally in your browser; nothing is sent to any server.