Read cookie headers without guesswork
Paste request Cookie headers or response Set-Cookie headers to inspect each name, value, attribute, duplicate, and parsing warning in one table.
Cookie and Set-Cookie formats
A request Cookie header contains name-value pairs. A Set-Cookie header contains one cookie followed by attributes such as Domain, Path, Expires, Max-Age, Secure, HttpOnly, and SameSite. Auto-detect recognizes the header prefix and common attribute names.
Local processing
Parsing happens in your browser. The text is not uploaded, stored as a browser cookie, or sent to an external service.