Decode CSR
csr = -----BEGIN CERTIFICATE REQUEST-----\nMIIC...\n-----END CERTIFICATE REQUEST-----
Result: Subject: CN=example.com
CSR Decoder
Paste a PEM or DER CSR to view its subject, public key, signature algorithm, and any requested extensions (like SANs).
Enter your values and press Calculate — the result appears here.
Worked examples
Frequently asked questions
What is a CSR?
A Certificate Signing Request (CSR) contains the public key and identity information you send to a Certificate Authority to request a certificate.
Is a CSR secure to share?
Yes. A CSR contains only the public key and identity information. It is designed to be shared openly with CAs.
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