SSL Certificate Check
Check SSL/TLS certificate details, expiration, issuer, and chain validity.
An SSL/TLS certificate check shows the certificate currently associated with a domain — its issuer, common name, validity dates, and how long until it expires. This tool reads certificate data from public Certificate Transparency logs, so you can confirm a site's certificate is valid, see who issued it, and catch expiries before they trigger browser warnings.
Frequently asked questions
What is an SSL/TLS certificate?
A digital credential that proves a site’s identity and enables the encrypted HTTPS connection your browser shows with a padlock.
What happens when a certificate expires?
Browsers show a full-page security warning and block the site until it’s renewed, so expiry monitoring matters.
Who issues certificates?
Certificate Authorities (CAs) such as Let’s Encrypt, DigiCert, and Google Trust Services. The issuer field shows which one signed it.
What is Certificate Transparency?
A public, append-only log of every issued certificate that lets anyone audit mis-issuance. This tool reads those logs.
Why might the certificate differ from my browser’s?
CT logs may include recently issued or alternate certificates; your browser shows whichever one the server currently presents.