Supercheck

Free tool

HTTPS checker

Check that HTTPS works, that HTTP redirects to it, and how strong the HSTS header is.

This check runs in Supercheck.

The free checker isn't available on this site. The method below shows what it looks at.

Try it in Supercheck

How we check

  • We request https://your-domain/ and http://your-domain/, each with up to 3 redirects.
  • HTTP passes when it ends on HTTPS on the same domain.
  • We parse Strict-Transport-Security and ask hstspreload.org for the preload status.

What this check can't tell you

  • Expiry date and issuer are not visible from this check. A Supercheck website monitor with SSL checks tracks expiry.
  • A certificate shows as valid when an HTTPS connection succeeds; we can't read the chain or TLS version.
  • One check from one Cloudflare data center, usually the one nearest you. It can't tell you whether the site is down for everyone.

Questions

Why don't you show the certificate expiry date?
The checker runs on Cloudflare Workers, which can't read the server's certificate. We say so rather than guess.
Do you store the URL I check?
Results sit in a 10-minute cache. Logs keep the host and the first path segment, never the full URL or query string, and never your IP address.
Can I stop my site from being checked?
Yes. The SupercheckBot page explains how to ask for an opt-out; we add your domain to a block list.