Free tools · Browser protection
Security headers checker.
The response headers that stop clickjacking, script injection and cookie theft. See which ones your site sends, and which it doesn't.
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The full Safety Check grades encryption, browser protection, sessions, attack filtering, AI agents, software, third parties, email and reputation, and shows exactly which gaps SENTRA closes.
Questions
What you should know.
Why do headers matter if my code is secure?
Headers are the browser's last line of defence. If a script is ever injected, a strict CSP stops it running; without one, nothing does.
Will adding headers break my site?
A CSP can, which is why it should start in report-only mode. The others are safe to add.
How does SENTRA help?
SENTRA AI SHIELD adds the missing headers to every response as it passes through, and Page Shield builds a CSP from your real scripts.