Free tool
SSL certificate checker
See in seconds whether your site shows as secure to your visitors, and when its certificate expires.
What we check
- Whether the certificate comes from an authority browsers trust, or is self-signed.
- Whether it covers your site's exact name, including www or subdomains.
- When it expires and how many days are left: an expired certificate shows “Not secure” to every visitor.
- Whether the chain is complete: a gap makes some phones reject your site.
We read the certificate the way a browser does, and keep nothing you type.