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Paste a HTTP response header block and audit against the OWASP Secure Headers Project - Strict-Transport-Security, X-Content-Type-Options, X-Frame-Options / CSP frame-ancestors, Referrer-Policy, Permissions-Policy, COOP/COEP/CORP.
This security header checker runs 100% in your browser. Nothing you paste, drop, or generate ever leaves your device - no analytics on your input, no uploads, no logs.
Browser can't fetch other domains' headers due to CORS. Paste from DevTools instead.
Same browser-only philosophy. Free, no signup, no upload.
Build a Content-Security-Policy header from a guided form - modern best practice.
Decode an SSL/TLS certificate (PEM) - issuer, subject, validity, SAN list.
Search every HTTP status code with description, RFC, and common causes.
Beautify, validate, and minify JSON with sortable keys, exact error positions, and a one-click copy.
Validate JSON syntax with exact line and column for every error.
Strip whitespace from JSON to produce a single compact line.
We design and ship internal tooling, dashboards, and customer-facing utilities. Tell us what you need and we'll scope it.