Free SSL checker
Check SSL certificates for any website
Enter a domain and instantly verify its SSL/TLS certificate. See the issuer, expiry date, protocol version, and whether the certificate is valid and trusted.
Try: github.com · google.com · cloudflare.com
How it works
Understanding SSL/TLS certificates
SSL/TLS certificates are the foundation of secure communication on the internet. When you visit a website over HTTPS, your browser and the web server perform a handshake where the server presents its certificate to prove its identity. The certificate also establishes the encryption keys used to protect data in transit.
A valid SSL certificate matters for more than just security. Search engines use HTTPS as a ranking signal, and browsers actively warn users when visiting sites without valid certificates. Expired or misconfigured certificates can lead to lost traffic, reduced trust, and lower search rankings.
FAQ
SSL certificate FAQ
Common questions about SSL/TLS certificates and web security.
Related guides
Learn more from the blog
Step-by-step guides on reading and using these results.
SSL Certificate Checker: How to Check If a Website Has SSL
Check an SSL certificate four ways: a free SSL certificate checker, the browser address bar, openssl and curl, and Certificate Transparency logs. Includes real command output and what each certificate error means.
SSL Certificate Types Explained: DV, OV and EV Compared
SSL certificate types explained: what the CA checks for DV, OV and EV certificates, how to tell them apart with real certificates from wikipedia.org, paypal.com and bankofamerica.com, and when each type makes sense.
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Check SSL certificates for any website
Check any website's SSL/TLS certificate. Verify expiry dates, issuer, protocol version, and certificate chain with our free SSL checker tool.