HSTS Preload Checker

Validate HSTS headers and preload list eligibility

Validate HSTS headers and preload list eligibility

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Privacy: HSTS Preload Checker runs completely in your browser. Your input never leaves your device.

HSTS Preload Checker FAQ

Is HSTS Preload Checker free to use?

Yes, this tool is completely free. There are no fees, subscriptions, or limits — open the page and use it as much as you like.

Does HSTS Preload Checker upload my data?

No. HSTS Preload Checker runs entirely in your browser on your own device. Your text and numbers never leave your computer.

Does HSTS Preload Checker work on mobile?

Yes. The tool is fully responsive and works on Android, iPhone, tablets, laptops, and desktop computers.