SSL Certificate Checker for Website Security
Check SSL certificate expiry, issuer, subject names, SAN coverage, trust status, and common HTTPS certificate problems for any public domain.
Check an SSL certificate
Why SSL certificate checks matter
SSL certificates protect visitors, support trust signals, enable secure forms and checkout pages, and are expected by modern browsers. An expired, mismatched, or incomplete certificate can create browser warnings, blocked payments, failed API calls, and lost leads. This SSL Certificate Checker helps confirm whether a public domain has a valid HTTPS certificate and when it expires.
Common SSL checker use cases
Use this tool after launching a website, moving hosting, changing Cloudflare SSL mode, adding a subdomain, renewing a certificate, or troubleshooting browser security warnings. It can help identify expiry dates, issuer details, domain coverage, and whether the certificate appears trusted for the domain being checked.
This SSL certificate checker helps confirm whether a website certificate is valid, trusted, and close to expiry. Use it when browsers show security warnings, after hosting changes, or before launching a new website.
What to check next
After checking SSL, run the Redirect Checker to confirm HTTP requests upgrade cleanly to HTTPS and the HTTP Headers Inspector to review HSTS and other security headers. For a complete website review, also check domain records, page size, and speed because secure connections, redirects, delivery settings, and hosting often work together.
Common questions
Helpful answers about this tool
What does the SSL Certificate Checker show?
It checks whether a website certificate is trusted, when it expires, and which website names it covers.
What should I do if the certificate is expired?
Contact the website host or certificate provider and renew or replace it before visitors continue using the website.