SSL Certificate Checker - Verify TLS Validity & Expiry

Use SSL Certificate Checker in 4 Steps

Enter domain

Type the domain name you want to check the SSL certificate for.

Check SSL

Click check to query the server and retrieve the certificate chain.

Verify validity

Check if the certificate is valid, trusted, and not expired.

View details

See the issuer, subject, valid from/to dates, and SANs.

What is an SSL Certificate?

An SSL (Secure Sockets Layer) certificate is a digital certificate that authenticates a website's identity and enables an encrypted connection. It ensures that all data passed between the web server and browsers remain private and integral.

Why is SSL Important?

SSL is crucial for protecting sensitive information such as credit card numbers, usernames, passwords, and other personal data. It also builds trust with your visitors and is a ranking factor for search engines like Google.

Common SSL Issues

Expired Certificate: SSL certificates have a finite lifespan (usually 1 year or less). If not renewed, browsers will show a security warning.
Name Mismatch: The domain name on the certificate must match the domain name in the URL. If they differ, browsers will flag it as insecure.
Untrusted Issuer: The certificate must be issued by a trusted Certificate Authority (CA). Self-signed certificates will trigger warnings.
Incomplete Chain: The server must provide the full certificate chain, including intermediate certificates, for browsers to trust it.

Frequently Asked Questions

How often should SSL certificates be checked?

At minimum weekly for public services, and after every certificate renewal or DNS/load balancer change.

What causes SSL chain errors?

Missing intermediates, wrong certificate bundle ordering, or outdated trust store assumptions are common causes.

Does TLS version affect SEO or trust?

Yes. Modern TLS and valid certificates improve user trust, reduce security warnings, and support technical quality signals.