Passwords & Auth100% In-BrowserSession Shield
Cookie Security Checker
Audit Set-Cookie headers for Secure, HttpOnly, SameSite, and domain scope security attributes.
Real-time processing·No server uploads·Zero telemetry
cookie-security-checker
LIVE
Set-Cookie Header Value
✓
Secure
HTTPS only
✓
HttpOnly
No JS access
✓
SameSite
Strict
✓
Expiry
Max-Age: 86400s
How to Use Cookie Security Checker
01
Paste a Set-Cookie header string or test individual cookie flags.
02
Get an instant security grade (A+ to F).
03
Review recommendations to prevent XSS session hijacking.
Privacy Guarantee
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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