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  1. Home
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  3. Security headers checker
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Security headers checker

Check pasted response headers or a live URL for the common security headers and read each raw value, presence kept separate from quality.

This tool is in beta

Still being tested. If a result looks wrong, tell us.

Report a problem

Nothing checked yet

Paste response headers, or switch to Live URL to fetch them through the proxy.

Presence is not quality, so this checker never grades: a permissive Content-Security-Policy still shows as present, and a missing X-Frame-Options can be deliberate for a page that is meant to be framed. Read the raw value column, not just the present or missing flag. The live path follows no redirects (the proxy reports 3xx with a Location), and it cannot see headers added by anything between you and the origin, such as a CDN or a service worker.

Input

Mode
Up to 100,000 characters
More settings▾

The parse reads name/value lines and folds continuation lines; a line without a colon is listed as malformed instead of dropped. Everything below is computed in this tab from that text.

More web & auth tools

  • HTTP header parser
  • CSP evaluator & builder
  • Cookie analyzer
All web & auth tools

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