Free · No signup required
SSL Certificate Checker
Check any website's SSL certificate — issuer, validity dates, and expiry, in seconds.
Try:
Expiry tracking
See exactly when a certificate expires
Issuer & chain
Verify who issued the certificate
Catch errors early
Spot expired or misconfigured SSL before visitors do
Reading an SSL certificate result
Every HTTPS website presents an SSL/TLS certificate during the connection handshake, proving its identity and enabling encryption. This tool fetches that certificate directly from the live site and surfaces the details that matter most for catching problems before visitors do — who issued it, when it expires, and whether it is currently valid.
What the results mean
1
Issuer
The certificate authority (CA) that verified the site and issued the certificate — common issuers include Let's Encrypt, DigiCert, and Sectigo.
2
Valid From / Valid Until
The certificate's active window. Most modern certificates last 90 days (Let's Encrypt) to one year — anything showing as expired means visitors are currently seeing a browser security warning.
3
Days remaining
A quick way to catch a renewal before it lapses. Certificates that expire unexpectedly are one of the most common causes of a sudden "Your connection is not private" warning on an otherwise working site.
Frequently asked questions
More Domain Tools
Everything you need to research and manage a domain, all free
Related guides
