Your files stay on your device

Set-Cookie Analyzer

Set-Cookie breakdown: attributes, expiry dates, prefix rules, warnings.
ClearSet-Cookie headers

Domain/Path, Secure, HttpOnly, SameSite, Max-Age/Expires with absolute dates, size, _Secure-/_Host- prefix rules: all against pasted headers, no requests.
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Paste, drop, or type to begin. Everything stays on this device.

Next door in Web

- HTTP Header Parser (/web/headers)
- JWT decoder (/web/jwt)
All web tools (/web)

Canonical HTML: https://nutter.tools/web/cookie
Markdown version: https://nutter.tools/web/cookie/index.md
Plain-text version: https://nutter.tools/web/cookie/index.txt
Agent index: https://nutter.tools/llms.txt