Security Headers Checker guide
Audit HSTS, CSP, X-Frame-Options, COOP, COEP and 5 more security headers — graded A+ to F with fix recommendations. 100% live HTTP probe, no API key required.
How to use it
Three steps to a result
Open the tool
Sign in free and open Security Headers Checker.
Fill in the inputs
Website URL.
Review and use the output
Copy, export or save the result, and check the data label to see how it was produced.
Details
What to expect
Live dataWhere the data comes from
Fetched in real time from an authoritative API (Google, DataForSEO, etc.). The numbers are real.
Free tierUnlimited
This tool runs on free APIs (Google / open data): unlimited usage on every plan.
What you need to provide
- Website URLExample: https://yoursite.com
Ready to try Security Headers Checker?
Free to start. No credit card.