SSL Certificate Checker
Check any website's SSL/TLS certificate. Verify issuer, expiry, protocol, and chain validity.
SSL certificates are the foundation of encrypted communication on the web. Every HTTPS connection relies on a valid certificate to authenticate the server and protect data in transit. Checking your SSL certificate regularly helps you catch expiring or misconfigured certs before they put your visitors at risk with browser security warnings and lost trust.
What We Check
- ✓Certificate issuer and subject details
- ✓Expiry date and days remaining
- ✓TLS protocol version check
- ✓Certificate chain validation
- ✓Instant results for any domain
Frequently Asked Questions
What does an SSL checker do?
An SSL checker connects to a domain over TLS on port 443, retrieves the certificate, and reports key details such as the issuer, subject, validity dates, protocol version, and whether the certificate chain is trusted. It helps you confirm that a site's encryption is properly configured.
How often should I check my SSL certificate?
You should check your SSL certificate at least once a month, and especially after renewals or server changes. Automated monitoring is ideal, but a manual check with an SSL checker tool can catch issues that automated systems sometimes miss.
What happens if my SSL certificate expires?
When an SSL certificate expires, browsers display a full-page security warning that prevents most visitors from reaching your site. Search engines may also lower your rankings. Renewing before expiry is critical to avoid lost traffic and diminished trust.
Can I use this SSL checker for any domain?
Yes. Enter any publicly accessible domain name and the tool will connect to its server to retrieve the SSL certificate details. It works with standard HTTPS sites, subdomains, and domains using both free and commercial certificates.
What is the difference between SSL and TLS?
SSL (Secure Sockets Layer) is the predecessor to TLS (Transport Layer Security). Modern websites use TLS 1.2 or TLS 1.3, but the term 'SSL certificate' is still widely used. Our SSL checker reports the actual TLS protocol version negotiated during the connection.
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