Certificate Signing Request (CSR) Decoder

Yes, absolutely safe. A Certificate Signing Request (CSR) only contains your public key and identity information; it never contains private keys or confidential secrets. Furthermore, RenewalSSL processes the decoding 100% client-side inside your browser memory—no data is transmitted to our servers.

Subject Alternative Names (SANs) are DNS extensions that allow a single SSL certificate to secure multiple domain names or subdomains (such as example.com, mail.example.com, and portal.example.net). If your CSR includes SANs, our decoder will list each protected name in the table above.

No. A CSR is cryptographically signed using the Private Key generated alongside it. Modifying even a single letter in the Base64 PEM text breaks the cryptographic signature, causing Certificate Authorities to immediately reject the file. If you need to make changes, use our CSR Generator to create a fresh key pair and request.

When a CSR is created, it is self-signed by the applicant’s private key. The ‘Cryptographic Signature Verified’ badge confirms that the mathematical signature inside the CSR matches its embedded public key. This guarantees the CSR is intact and has not been truncated or corrupted.

Copy the raw CSR text, browse our catalog of commercial SSL certificates (from Sectigo, DigiCert, or GeoTrust), and paste your CSR during the certificate configuration step. Once the CA completes validation, your certificate will be issued immediately.