CORS Config Generator

CORS Config Generator — runs 100% in your browser. No data is uploaded; nothing leaves your device.

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Allowed origin

Methods

Allowed headers

Allow credentialsMax-Age

Raw headers

Access-Control-Allow-Origin: https://app.example.com
Access-Control-Allow-Methods: GET, POST, OPTIONS
Access-Control-Allow-Headers: Content-Type, Authorization
Access-Control-Allow-Credentials: true
Access-Control-Max-Age: 86400

Express middleware

app.use((req, res, next) => {
  res.header("Access-Control-Allow-Origin", "https://app.example.com");
  res.header("Access-Control-Allow-Methods", "GET, POST, OPTIONS");
  res.header("Access-Control-Allow-Headers", "Content-Type, Authorization");
  res.header("Access-Control-Allow-Credentials", "true");
  if (req.method === "OPTIONS") return res.sendStatus(204);
  next();
});

nginx

add_header Access-Control-Allow-Origin "https://app.example.com" always;
add_header Access-Control-Allow-Methods "GET, POST, OPTIONS" always;
add_header Access-Control-Allow-Headers "Content-Type, Authorization" always;
add_header Access-Control-Allow-Credentials "true" always;

Build CORS headers and ready-to-paste server snippets. Generated entirely in your browser.

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Reach for CORS Config Generator whenever you need to generate a security header for your site. Web developers and security engineers use it to harden a site before launch, fix failing securityheaders.com or Mozilla Observatory scans, and meet client or compliance security requirements.

How to embed CORS Config Generator on your website

Add this free tool to your own site, blog or intranet — it's 100% free to embed. Paste this snippet where you want the tool to appear; it loads a clean, self-contained version with no ads or navigation.

<iframe src="https://tooljolt.com/embed/cors-config-generator" title="CORS Config Generator" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px" loading="lazy"></iframe>

About CORS Config Generator

CORS Config Generator is a free online web-security header tool that lets you cORS Config Generator. It runs entirely in your browser — no sign-up, no uploads and nothing ever sent to a server — so it is fast, private and safe to use with sensitive data. Whether you are a developer, security professional, student or just curious, CORS Config Generator gives you an instant, reliable result with zero setup.

How to use CORS Config Generator

1Pick the options you want in CORS Config Generator.
2Copy the generated header (or meta tag).
3Add it to your server, CDN or framework config.
4Re-test with a security-headers scanner to confirm.

Why use CORS Config Generator?

✓100% free with no sign-up, accounts, watermarks or usage limits
✓Runs entirely in your browser — your input never leaves your device, ideal for confidential security data
✓Hardens your site against XSS, clickjacking and data leaks
✓Improves scores on Mozilla Observatory and securityheaders.com
✓Works on any device with a modern web browser, online or offline

Frequently asked questions

Where do I add the output from CORS Config Generator?+

Send it as an HTTP response header from your server or CDN (Nginx, Apache, Cloudflare, Vercel, etc.). Many headers can also be set via a meta tag, but the HTTP header is the most reliable.

Will this improve my security score?+

Yes. Correct security headers are checked by tools like Mozilla Observatory and securityheaders.com and defend against XSS, clickjacking and data leaks — a quick win for safety and for the trust signals search engines value.

Is CORS Config Generator free to use?+

Yes. CORS Config Generator is 100% free with no sign-up, no account, no usage limits and no watermarks. Use it as often as you like.

Does CORS Config Generator upload my data to a server?+

No. CORS Config Generator runs entirely in your browser using JavaScript — nothing you type or upload ever leaves your device. That makes it safe to use with sensitive or confidential security data.