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Application security tools

Application security / FREE TOOL

Security header review

Turn HTTP response headers into a practical review of browser protections, with notes on what needs closer attention.

Local review / optional AI

01 Your input

Local processing only. Maximum file size: 2 MB.

02 Your results

A closer look starts here.

Add your input and run the check. We will show the observations and explain what needs review.

 

A QUICK WALKTHROUGH

How to use it

  1. 01Copy one response header block from browser developer tools.
  2. 02Review the observed protection settings.
  3. 03Check recommendations against the application and response type.

What this check can tell you

Analyzes pasted headers only. It does not contact a website, validate the full CSP grammar, test browser behavior, or prove a site is secure. Appropriate policies depend on the application.

The initial review processes files in this tab. If you choose the optional AI summary, the displayed findings are sent to Cloudflare AI; your raw file, result tables and decoded token claims are excluded.

OWASP Secure Headers Project
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