Cookie Header Builder
Build Set-Cookie header strings with SameSite, Secure, HttpOnly, and Max-Age options.
What the Cookie Header does
Build Set-Cookie header strings with SameSite, Secure, HttpOnly, and Max-Age options. A session cookie can include HttpOnly, Secure, SameSite=Lax, and a one-week max age Adjust the controls and the preview updates immediately, so you can dial in exactly what you want and copy the result straight into your project — no build step and no account.
One thing to keep in mind: Cookie behavior depends on domain, path, HTTPS, and browser privacy settings.
Private and in your browser
Everything runs locally in your browser. Your input is never uploaded, so the tool stays fast and works offline, and the copy and download buttons always use the current result shown in the output panel.
Frequently Asked Questions
What does the Cookie Header do?
Build Set-Cookie header strings with SameSite, Secure, HttpOnly, and Max-Age options. A session cookie can include HttpOnly, Secure, SameSite=Lax, and a one-week max age.
What should I keep in mind?
Cookie behavior depends on domain, path, HTTPS, and browser privacy settings
Does it upload my input?
No. The Cookie Header runs entirely in your browser — your input is never uploaded, and it keeps working offline once the page has loaded.
Practical utilities for front-end design and implementation work.