Security Headers Checker
Grade a site's HTTP security headers — HSTS, CSP, clickjacking protection, cookie flags — with a fix for every gap.
Server-processed
- Public data only
- No logs, nothing stored
- Free forever
This tool processes data online
It fetches the response headers of the website you enter — the same headers any browser already receives when visiting it. No page body is downloaded.
- No logs, nothing stored. What you submit is processed in memory and discarded — never saved, never used for marketing, never shared.
- Public data only. The tool fetches what anyone can already see in a browser — no logins, no private pages, no bypassing paywalls.
- Fair use. Ten checks per minute per visitor — each one is a real network request on our side.