Set-Cookie Header Builder

Build a hardened Set-Cookie header with Secure, HttpOnly and SameSite — runs 100% in your browser. No data is uploaded; nothing leaves your device.

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NameValuePathDomainMax-Age (seconds)SameSite

Secure HttpOnly __Host- prefix (hardened)

Set-Cookie: session=abc123; Path=/; Max-Age=3600; SameSite=Lax; Secure; HttpOnly

Builds a hardened Set-Cookie header with the right Secure / HttpOnly / SameSite flags and flags common misconfigurations. Runs entirely in your browser.

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Reach for Set-Cookie Header Builder whenever you need to build a hardened Set-Cookie header with Secure, HttpOnly and SameSite. 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 Set-Cookie Header Builder 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/set-cookie-builder" title="Set-Cookie Header Builder" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px" loading="lazy"></iframe>

About Set-Cookie Header Builder

Set-Cookie Header Builder is a free online web-security header tool that lets you build a hardened Set-Cookie header with Secure, HttpOnly and SameSite. 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, Set-Cookie Header Builder gives you an instant, reliable result with zero setup.

How to use Set-Cookie Header Builder

1Pick the options you want in Set-Cookie Header Builder.
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 Set-Cookie Header Builder?

✓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 Set-Cookie Header Builder?+

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 Set-Cookie Header Builder free to use?+

Yes. Set-Cookie Header Builder is 100% free with no sign-up, no account, no usage limits and no watermarks. Use it as often as you like.

Does Set-Cookie Header Builder upload my data to a server?+

No. Set-Cookie Header Builder 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.