---
title: "Cookie Analyzer"
description: "Analyze browser cookies for security attributes including Secure, HttpOnly, SameSite, and expiration. Identify security issues and get recommendations."
url: https://findutils.com/security/cookie-analyzer/
category: security
---

# Cookie Analyzer

Analyze browser cookies for security attributes including Secure, HttpOnly, SameSite, and expiration. Identify security issues and get recommendations.

**Use this tool:** [Cookie Analyzer](https://findutils.com/security/cookie-analyzer/)

## Programmatic access

- REST id `cookie-analyzer`: POST https://api.findutils.com/api/tools/cookie-analyzer/execute (reference: https://findutils.com/api/cookie-analyzer/)
- MCP tool `cookie_analyzer` on https://mcp.findutils.com (reference: https://findutils.com/mcp/cookie-analyzer/)

## Why Analyze Cookies?

Cookies without proper security attributes can be stolen via XSS, CSRF, or man-in-the-middle attacks. Understanding cookie security helps protect user sessions.

## Cookie Security Tips

- Always set the Secure flag on cookies in production to prevent transmission over unencrypted HTTP connections.
- Use HttpOnly on session and authentication cookies to block access from JavaScript and reduce XSS attack impact.
- Set SameSite=Strict for sensitive cookies and SameSite=Lax as a minimum default for all other cookies.
- Prefer the __Host- prefix for session cookies to enforce HTTPS, exact path, and single-origin scope simultaneously.
- Set reasonable Max-Age or Expires values instead of relying on session cookies, so stale tokens are automatically purged by the browser.

## Frequently Asked Questions

### What does the Secure flag do?

The Secure flag ensures cookies are only sent over HTTPS connections, preventing interception on unsecured networks.

### What is HttpOnly?

HttpOnly prevents JavaScript from accessing the cookie, protecting against XSS attacks that try to steal session cookies.

### What is SameSite?

SameSite controls when cookies are sent with cross-site requests. 'Strict' or 'Lax' helps prevent CSRF attacks.

### What are cookie prefixes?

__Secure- and __Host- prefixes enforce security requirements. __Host- is the most restrictive, requiring Secure, exact path, and no Domain attribute.

### How do I check if my cookies are secure?

Paste your Set-Cookie header or cookie string into a cookie analyzer tool. It will check for the Secure flag, HttpOnly attribute, SameSite policy, proper expiration, and cookie prefix usage. Each missing attribute represents a potential vulnerability.

### What is the difference between session cookies and persistent cookies?

Session cookies have no Expires or Max-Age attribute and are deleted when the browser closes. Persistent cookies include an expiration date and remain on disk until they expire. Both types need Secure, HttpOnly, and SameSite attributes for proper security.

### Why does SameSite=None require the Secure flag?

Browsers reject SameSite=None cookies that lack the Secure flag. Since SameSite=None allows cookies on cross-site requests, requiring HTTPS ensures the cookie cannot be intercepted in transit during those cross-origin flows.

### Do cookies affect GDPR compliance?

Yes. Under GDPR and ePrivacy regulations, websites must obtain user consent before setting non-essential cookies. Auditing your cookies helps identify tracking and analytics cookies that require a consent banner. Use a cookie analyzer alongside a privacy policy review to stay compliant.

### What is the __Host- cookie prefix?

The __Host- prefix is the strictest cookie security mechanism. Cookies with this prefix must have the Secure flag, must set Path=/, and cannot include a Domain attribute. This prevents subdomain attacks and ensures the cookie is locked to a single origin.

### Can I analyze cookies from any website?

You can analyze any cookie string or Set-Cookie header you have access to. Open your browser. DevTools, go to the Application or Storage tab, copy the cookie values, and paste them into the analyzer. The analysis runs entirely in your browser with no data sent to any server.

## Related Tools

- [Security Headers Analyzer](https://findutils.com/network/security-headers-analyzer/)
- [URL Safety Checker](https://findutils.com/security/url-safety-checker/)
- [Data Sanitizer](https://findutils.com/security/data-sanitizer/)
- [SSL Certificate Checker](https://findutils.com/network/ssl-certificate-checker/)
- [Privacy Policy Checker](https://findutils.com/security/privacy-policy-checker/)
- [JWT Security Validator](https://findutils.com/security/jwt-security-validator/)
- [DNS Security Scanner](https://findutils.com/network/dns-security-scanner/)
- [Email Security Checker](https://findutils.com/security/email-security-checker/)