SSL Certificate Checker

Paste PEM or upload a certificate file to check validity, issuer, subject, and SANs

PEM certificate (paste or upload)

SSL / Certificate Checker

Paste a PEM-encoded certificate or upload a .pem or .crt file to see validity (Valid / Expired / Not yet valid), issuer, subject, validity dates, and subject alternative names (SANs). Processing runs in your browser only.

Use cases

Expiry check – See if a cert is valid, expired, or not yet valid
Issuer and subject – Inspect who issued the cert and for which CN/SANs
Chain – If you have multiple certs, the first is shown here; use the PEM Decoder for full chain decoding.