Check CSR

Why check a CSR before submitting it

Certificate Authorities will reject a malformed CSR, and a well-formed one with the wrong details (a typo in the domain, an expired key format, the wrong organization name) still wastes a submission cycle. Running a quick validity check first confirms the CSR actually parses correctly and shows exactly what identifying information it carries, so you can catch mistakes before they cost you a reissue.

What a CSR actually contains

A Certificate Signing Request bundles your public key together with identifying information about the domain and organization requesting the certificate - the Common Name (your domain), plus organization, location, and contact details. The Certificate Authority uses these details, after verifying domain ownership, to issue a certificate that matches exactly what the CSR requested.

What the key type and bit length tell you

Most modern CSRs use RSA keys at 2048 bits or stronger, or increasingly, elliptic-curve (EC) keys - weaker or outdated key types and lengths may be rejected outright by some Certificate Authorities, or flagged as insufficient for current security standards, so confirming this field matches what your CA expects before submitting saves a round trip.

Where a CSR actually comes from

A CSR is generated on the server (or via your hosting control panel) together with a matching private key that never leaves that server - the CSR itself is safe to paste into a tool like this or send to a Certificate Authority, since it contains only the public key and your identifying details, not anything secret.

Domande frequenti

What does "Invalid CSR" mean exactly?

It means the pasted text couldn't be parsed as a well-formed CSR - usually because part of the PEM block (including the BEGIN/END lines) is missing, or the text was altered when copying.

Does a valid CSR guarantee a Certificate Authority will accept it?

It confirms the CSR itself is well-formed, but a CA can still reject it for other reasons - domain ownership verification failing, for example.

Is it safe to paste my CSR into a tool like this?

Yes - a CSR contains only your public key and identifying details, not your private key or any secret information, so sharing it for validation purposes carries no security risk.

What key type and length should my CSR use?

RSA at 2048 bits or stronger, or an elliptic-curve (EC) key, are the current standard. Weaker or outdated key types may be rejected by some Certificate Authorities.

Where do I generate a CSR in the first place?

Most hosting control panels and web servers (like OpenSSL, cPanel, or IIS) have a built-in CSR generation step that also creates the matching private key - check your specific server or hosting provider's documentation for the exact command or menu.