CSR Decoder

Use our instant CSR Decoder to decode your Certificate Signing Request and display the contents in a human-readable format.

Enter CSR

About CSR Decoder Tool

If you have ever received a Certificate Signing Request (CSR) from a client and wanted to know what it contained, then our CSR Decoder tool is for you. It will help you decode the contents of your CSR and display the contents in a human-readable format.

To decode your CSR, simply enter the encoded CSR into the above form and click the "Decode" button and our tool will decode the CSR and will show the result in a formatted table.

What is a CSR?

A CSR is an encoded message submitted by an applicant to a CA to get an SSL certificate. In other words, it is a request from an applicant to a CA to get a digital certificate. It's generally created on the host at which the certificate will be set up and contains information which will be held in the certificate like the business name, common name (domain name), locality, and state. Additionally, it includes the public key which will be contained in the certification.

A CSR carries the following information in encrypted form as

Common Name
Organization Name
Organization Unit
City
State
Country
Email Address

The common form of a CSR File is .PEM Format

What is Private Key ?

A private key is generally created in precisely the same time when you create the CSR. It should be saved safely on the server you generated it on. During the handshake process, the private key and its public counterpart are used for authentication. A user’s web browser will use the public key to decrypt the digital signature left by the private key. If it’s readable, the signature is authenticated and secure connection can be negotiated. If you lose your private key, you will be unable to install your SSL certificate and will need to generate a new key pair.

Here is an example of what a CSR looks like: