CSR Decoder — Verify Your CSR Contents
Paste your CSR to verify the common name, organization, key size and SANs. Decoded in your browser, never uploaded.
The CSR Decoder reveals what's inside a Certificate Signing Request: common name (CN), organization details, key size, signature algorithm and any SANs. Catch mistakes before submitting your CSR to a certificate authority. Everything runs in your browser.
Frequently Asked Questions
Why check my CSR before submitting it?
Typos in the CN, missing or wrong SANs or a weak key size lead to a mis-issued certificate; checking prevents that.
What key size should I use?
Use at least 2048-bit RSA (or 256-bit EC). 1024-bit is no longer considered secure.
Do I need to create a CSR for a free certificate?
No. Our free SSL wizard generates the CSR for you automatically; you only verify your domain.