Cookie Security Checker
Audit Set-Cookie headers for Secure, HttpOnly, SameSite, and domain scope security attributes.
How to Use Cookie Security Checker
Paste a Set-Cookie header string or test individual cookie flags.
Get an instant security grade (A+ to F).
Review recommendations to prevent XSS session hijacking.
Cookie Security Checker runs 100% client-side in your web browser. Your data, passwords, keys, and files are processed using the Web Crypto API and never transmitted to any server. Zero telemetry, zero storage, zero cloud processing.
Frequently Asked Questions
Why is HttpOnly essential?
HttpOnly prevents malicious JavaScript from accessing sensitive session cookies via document.cookie during an XSS attack.
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