Enter one or more cookies to analyze their security
Cookie Security Best Practices
Secure Flag
Secure: Only send over HTTPS connections
HttpOnly Flag
HttpOnly: Prevent JavaScript access (XSS protection)
SameSite Attribute
SameSite: Control cross-site request sending
Cookie Prefixes
__Host- and __Secure- prefixes enforce security requirements
How to Use the Cookie Analyzer
- 1
Copy your cookie data
Open your browser DevTools (F12), navigate to the Application tab, and find the Cookies section. Copy the cookie string or the full Set-Cookie response header you want to analyze. - 2
Paste into the analyzer
Paste the cookie string or Set-Cookie header into the input field. You can analyze a single cookie or multiple cookies separated by newlines. - 3
Review the security report
Click Analyze Cookies to generate a detailed security report. Each cookie receives a security score based on its attributes: Secure, HttpOnly, SameSite, expiration, path scope, and prefix usage. - 4
Fix flagged issues
Follow the recommendations to add missing security attributes. Prioritize adding the Secure and HttpOnly flags first, then set an appropriate SameSite policy. Re-analyze after making changes to confirm a clean score.
Common Use Cases
Pre-deployment security audit
GDPR and privacy compliance
Penetration testing and bug bounty
Developer education and training
Why Analyze Cookies?
The Cookie Analyzer is a free online tool that inspects HTTP cookie strings and Set-Cookie headers for security vulnerabilities. It checks every cookie attribute that matters: the Secure flag, HttpOnly protection, SameSite policy, expiration settings, path scope, and cookie prefix compliance. Each cookie receives a security score with specific, actionable recommendations to fix any issues found. All analysis runs entirely in your browser — no cookie data is ever sent to a server.
Properly configured cookies are the foundation of web session security. A missing HttpOnly flag can let an XSS attack steal session tokens. A missing SameSite attribute can leave forms open to CSRF attacks. The Secure flag prevents cookies from leaking over plain HTTP. If you manage web applications, auditing cookies should be part of every release cycle. Pair this tool with the Security Headers Analyzer to check your full HTTP response security, or use the SSL Certificate Checker to verify that the HTTPS connection your Secure cookies depend on is properly configured.
For broader web security audits, combine cookie analysis with a Privacy Policy Checker review to ensure your cookie usage aligns with your published privacy practices. Developers working with JWT-based authentication should also run tokens through the JWT Security Validator to catch signing and expiration issues that cookies alone cannot reveal.
How It Compares
Many cookie analysis approaches exist, from browser DevTools inspection to paid security scanners. Browser DevTools show raw cookie data but do not flag security issues or provide remediation guidance. Paid application security tools like Burp Suite and OWASP ZAP include cookie analysis as part of larger scanning suites, but they require installation, configuration, and often a license fee. The FindUtils Cookie Analyzer fills the gap: it provides instant, focused cookie security analysis with clear recommendations, entirely free and entirely in-browser.
Compared to manual review, an automated analyzer catches issues humans routinely miss, such as SameSite=None without the Secure flag, overly broad path settings, or cookie prefix violations. It is especially valuable during rapid development cycles where cookies are added or modified frequently and a quick validation pass can prevent security regressions from reaching production.