Security
HSTS Preload Checker
Check HSTS configuration and preload eligibility.
Runs in your browser. Free — nothing sensitive leaves the page.
About this tool
Free hsts preload checker tool. Check HSTS configuration and preload eligibility. No signup, nothing uploaded.
Frequently asked questions
Is this safe to use?
Yes. Generation and hashing happen locally in your browser.
Do you store anything?
No. Nothing you enter is transmitted or stored.
Should I trust this for production?
Use it to generate or verify, but follow your own security policy.
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