Security Headers Checker· free · first run without an account
Paste a URL and I'll grade its HTTP security posture — HTTPS and HSTS, Content-Security-Policy quality, framing, MIME sniffing, referrer and permissions policies, cookie flags, version leaks — then write the header config for your stack.
Enter to send · Shift+Enter for a new line · Paste or drop files
AI can make mistakes. Check claims before you publish.