SSL Tools
Check SSL/TLS certificates for validity, expiry, issuer, and supported protocol version.
3 tools in this category
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Check the Certificate Your Visitors Actually Get
An SSL/TLS certificate is what gives a website the padlock and the https:// address. When it expires, is issued for the wrong name, or the server is missing an intermediate certificate, browsers show a full-page warning and most visitors leave. These tools connect to the live server and show you what a browser receives right now.
Start with the SSL Certificate Checker for the full picture: validity, issuer, the domains the certificate covers and the days remaining. If you only need to know when a certificate runs out - for example across a list of client sites - the SSL Expiry Checker gives you the date on its own. To confirm the server uses modern encryption, the TLS Version Checker shows the negotiated protocol; you want TLS 1.2 or 1.3.
When to Use Them
- After installing or renewing a certificate, to confirm the new one is being served.
- When a visitor reports a "Not secure" warning on one device but not another.
- Before a launch or hosting move, checking both the www and non-www names.
For the HTTPS redirect and HSTS header that go with a certificate, see the Security Tools.