Security Headers Auditor
Grade HTTP response headers against security best practices.
Response headers
Paste raw HTTP response headers (one per line).
Audit results
Analyzed locally — headers never leave your browser.
Paste response headers to see a graded security audit.
About the Security Headers Auditor
Paste raw HTTP response headers and get a graded checklist covering HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy, with concrete fixes for anything missing or weak.
Examples
Missing HSTS
X-Frame-Options: DENYOutput
Strict-Transport-Security: fail — missingKeyboard shortcuts
- Copy the main outputCtrl / ⌘ + Shift + C
- Download the resultCtrl / ⌘ + S
- Share this toolCtrl / ⌘ + Shift + S
- Reset the inputsAlt + R
- Open the tool search paletteCtrl / ⌘ + K
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Check if X-Frame-Options and CSP frame-ancestors block framing.
Frequently asked questions
Read more
- Content Security Policy from scratch
CSP is one of the most effective defenses against XSS, and one of the easiest to get wrong. Here's how to build a policy that actually works.
Comments
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Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser