SSL Certificate Checker / Utilities
CSR Decoder
Paste a CSR (PKCS#10) to check its subject, names (SANs), key type and size and signature algorithm before you send it to a certificate authority. Decoded in your browser.
Decoded in your browser: nothing you paste is sent to us.
Check a live site
The SSL Certificate Checker reads the certificate your server actually sends, its chain, revocation, CAA and renewal health.
Open the SSL Certificate Checker