Free SSL Certificate Checker Online
Verify SSL certificate details, expiration, and validity for any domain
Complete SSL Analysis
Verify certificate validity and configuration at a glance
See the certificate issuer, subject, serial number, and signature algorithm used for the SSL certificate.
Check the exact issue and expiration dates to ensure your certificate is current and plan renewals.
Get an instant pass or fail assessment of the certificate validity including chain verification.
About This Tool
This tool inspects the SSL/TLS certificate a website presents, reporting who it was issued to, who issued it, and when it expires. That certificate is what enables the padlock and HTTPS: it proves the site's identity and encrypts traffic between the browser and the server.
The most common real-world problem it catches is an expired or soon-to-expire certificate, which makes browsers show a security warning and can take a site offline for cautious visitors. The checker also flags mismatched domains and incomplete certificate chains, both of which break trust even when the certificate itself is valid.
How to Use It
- Enter the domain to inspect.
- Review the certificate's issuer, subject, and validity dates.
- Act on any warning about expiry, domain mismatch, or an incomplete chain.
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