CSR Decoder

Decode your CSR with our free CSR Decoder tool and view all its information, allowing you to easily verify all details are correct and troubleshoot issues with certificate issuance. Enter your complete CSR into the field below, and our CSR reader will do the rest.

New and More Secure!

Our new CSR Decoder will perform the decoding in your browser without submitting any information to our servers, making it more secure than ever.

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Frequently Asked Questions

: A CSR stands for Certificate Signing Request. It is a block of encoded text containing information about the entity requesting a certificate from a Certificate Authority (CA). The CSR includes the organisation's name, common name (domain name), locality, and country. It also contains the public key that will be included in the certificate.
When you apply for an SSL/TLS certificate from a CA, you generate a CSR on your server. The CA then uses the CSR to create your digital certificate, which encrypts communications between clients and your server over the internet. The process ensures that the public key can be trusted by users and devices communicating with the server, and the CA has verified it as a trusted third party.
: The main reason to decode a CSR is to convert all the encoded information into plaintext, allowing you to view and verify whether the details are correct before submitting it to your chosen CA.
Beyond allowing you to confirm details like organisation name, domain name, etc, a CSR test provides information on your key algorithm, key size, and the encryption standard to be used. This is critical to ensuring that your CSR meets current security standards, so the CA does not reject it (for example, if the key size is too small or you are using a deprecated algorithm like SHA-1 or MD5).
: Not at all! Your CSR only contains the public key and other basic information like your domain name and organisation name, so performing a CSR check with our tool does not risk exposing any sensitive information. For your added peace of mind, our CSR viewer/decoder does not save any information to our servers.