Security
CSR Decoder
Decode PEM or DER certificate signing requests and inspect their subject, extensions and public key.
Tool
Decode PEM or DER certificate signing requests and inspect their subject, extensions and public key.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this CSR decoder to inspect a certificate signing request before submitting it to a certificate authority. Review the subject, public key, signature algorithm and requested extensions without uploading the CSR.
Examples
- Paste a PEM certificate signing request
- Upload a DER certificate signing request
- Inspect requested subject alternative names
Frequently Asked Questions
What information can be decoded from a CSR?
A CSR may contain the subject name, public key, signature algorithm and requested extensions such as subject alternative names.
Can the decoder verify the CSR signature?
Yes. The tool can verify whether the CSR signature matches the included public key.
Does decoding a CSR issue a certificate?
No. The tool only displays and validates the contents of the certificate request.