Free tools
SSL checker
Check a website's certificate: validity, expiry, issuer, chain trust, host name match, and the TLS protocol and cipher it negotiates.
- Expires
- Issuer
- Chain trusted
- Host name match
- Protocol and cipher
- Subject
- Names on the certificate
- Chain sent by the server
Checked . One handshake shows the best protocol we share with the server, not every protocol and cipher it accepts. The full TLS scan with a grade is part of the 7-day trial, the Free plan and the paid plans.
What the SSL checker looks at
We open a TLS connection to the host on port 443 and read the certificate it sends, also when it is expired or not trusted. A second connection with full verification decides whether the chain is trusted. You see when the certificate expires, who issued it, whether it names the host you entered, and the TLS version and cipher of the connection.
A certificate that is about to expire takes a site offline for every visitor at once. UptimeVanguard reads your certificates every day and alerts you weeks before they expire.
Get alerted before your visitors notice
Daily certificate checks with expiry alerts, a full TLS grade, and uptime checks from a region you pick out of ten.
Free plan: 3 sites checked every 5 minutes, with every check type and every alert channel. No card needed. Paid plans check every 60 seconds, and every 30 seconds for up to 10 HTTP or ping checks per team.