Cookie inspector & Set-Cookie builder
Paste a Cookie request header or Set-Cookie response header to inspect it — or build a new Set-Cookie line with the usual attributes.
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Mode
Paste header
Parsed cookies
Detected:
No cookies found — check the format.
| Name | Value |
|---|---|
| Name | Value | Path | Domain | Max-Age | Expires | Secure | HttpOnly | SameSite | Partitioned |
|---|---|---|---|---|---|---|---|---|---|
Cookie fields
Lifetime
Flags
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Output
Set-Cookie
Everything runs in the browser — cookie values never leave this page.
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About this tool
Browsers store small name=value pairs called cookies. The server sends them with Set-Cookie on a response; the browser echoes them back in a Cookie header on later requests.
Attributes like Path, Domain, Max-Age, Secure, and SameSite control where the cookie is sent and how long it lives. Getting them wrong is a common source of “login works locally but not in prod” bugs.
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