SSL certificate checker
Enter a domain to see its SSL certificate: when it expires, who issued it, which names it covers and whether browsers trust it.
Free, no signup
What it checks
- Expiry and days left
- The exact expiry date, so you know when to renew.
- Trust problems
- Expired, self-signed, wrong domain or an incomplete chain: the errors browsers turn into a warning page.
- Names and issuer
- Every domain the certificate covers, who issued it and its key type.
Questions and answers
Enter the domain above. We connect to it on port 443 like a browser does and show the expiry date and the days left.
The usual causes are a certificate for a different name (with or without www), a self-signed certificate or a missing intermediate certificate on the server. The checker names the problem.
Yes, every 90 days. They renew automatically, but a renewal fails silently when DNS, firewall or server settings change.
Yes. Add the site to UptimeGuardian for free and we email you 30, 7 and 1 day before it expires.
Get reminded before your certificates expire
Free for 10 monitors. No credit card required.
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