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Free SSL Checker
Check any website's SSL certificate in seconds — see who issued it, when it expires, how many days are left, and which domains it covers. No sign-up needed.
How to use the SSL checker
- Paste the website's URL (or just the domain name) into the box above.
- Click Check SSL — we'll fetch the site's live certificate details.
- Review the issuer, expiry date, days remaining and covered domains, and renew the certificate before it runs out.
About SSL certificates
SSL certificates enable HTTPS, the encrypted version of HTTP. They create a secure, private connection between a visitor's browser and your web server, so everything sent between the two — passwords, payment details, form entries — is scrambled and unreadable to anyone eavesdropping on the network.
Expiry matters because a lapsed certificate is worse than none at all: browsers block or loudly warn visitors away from sites with expired certificates, which can instantly kill traffic, sales and trust. Certificates typically last 90 days (free Let's Encrypt) to about a year, so checking them regularly — or before a big launch — is cheap insurance.
Frequently asked questions
What is SSL and why does my site need it?
SSL (Secure Sockets Layer — today actually its successor TLS) encrypts the connection between a visitor's browser and your website, so logins, payments and personal details can't be intercepted. Without a valid certificate browsers show a "Not secure" warning, which scares visitors away and can hurt your Google rankings, since HTTPS is a ranking signal.
My certificate expired — what do I do?
Renew it with your hosting provider or certificate authority right away, then reinstall the new certificate on your server and re-check it here to confirm the new expiry date. If you use Let's Encrypt or your host's free SSL, renewals are usually automatic — check that the auto-renew job is running. To avoid surprises, set a reminder a week before each expiry.
Can I check a free Let's Encrypt certificate here?
Yes. This checker works with any valid SSL/TLS certificate, including free ones from Let's Encrypt, ZeroSSL, and the free certificates bundled with hosting plans. Enter the domain and you'll see the issuer, expiry date, days remaining and the domains covered.
The checker says "certificate mismatch" — what does that mean?
A certificate mismatch means the domain you checked is not listed on the certificate the server is serving — for example the certificate covers www.example.com but you checked example.com. Visitors would see a browser security warning. Fix it by getting a certificate that includes all your domains (or a wildcard certificate) and reinstalling it.