What this free tool checks
Certificate problems can trigger browser warnings and prevent normal HTTPS access. Check expiry and hostname validity before they become outages.
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Free SSL Certificate Checker
Inspect the live HTTPS certificate presented by a website. Review validity, expiry, issuer, hostname matching, TLS protocol and certificate details in a clear report.
Read the live certificate before it becomes an outage
Review certificate validity, hostname matching, expiry, issuer and negotiated TLS details together. Expiry warnings deserve attention before browsers begin rejecting the connection.
Common mistakes to avoid
A valid certificate does not mean the application is fully secure, and a short remaining lifetime is not automatically a problem when reliable automatic renewal is configured.
What to do after using this tool
Fix hostname or trust errors immediately, verify renewal automation when expiry is approaching and retest after certificate changes.
Frequently Asked Questions
What does the SSL Certificate Checker verify?
It opens a live TLS connection and reports certificate dates, issuer, subject, hostname matching, protocol, cipher and verification status where available.
How early should I renew an SSL certificate?
Do not wait for the final day. Automated certificates often renew in advance; if the remaining period becomes unexpectedly short, verify that automatic renewal is working.
Does a valid SSL certificate mean a website is completely secure?
No. A valid certificate protects and authenticates the TLS connection, but application security, updates, access control and other protections still matter.