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/secheaders — HTTP Header Security Checker
Paste a site's HTTP response headers (from curl -I or your browser's network tab) and get a security grade with specific fixes. Checks the headers that harden a site against clickjacking, MIME sniffing, protocol downgrade and cross-site scripting. Nothing is sent anywhere — it's all parsed in your browser.
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Security score
Related tools
Ping DNS WHOIS Traceroute HTTP Headers Port Check
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How this works

Stores only this report's id in your browser (localStorage) so a small note can pop up here once it ships. No account, nothing sent to us, no tracking. Clearing this site's data forgets it.
Changelog

What changed, and when. Newest first.

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