What is Certificate Decoder?
Paste PEM text or choose a CRT, CER, or DER file to see the certificate's subject, issuer, validity period (and days left), SAN domain list, public key algorithm, and SHA-256 fingerprint in a table.
How to use
- 1
Paste PEM text or choose a certificate file.
- 2
Review the certificate details.
- 3
Check that the expiry date and domains are right.
Use cases
Checking SSL expiry
See how long a server certificate has left.
Verifying domains
Check the list of domains (SANs) covered by a certificate.
FAQ
Is my certificate uploaded?+
No. The certificate is parsed in your browser and never sent anywhere.