Check CSR
Paste a Certificate Signing Request to validate it and inspect all fields — domain, organisation, key type, key size and Subject Alternative Names.
Frequently Asked Questions
What is a CSR?
A Certificate Signing Request (CSR) is a block of encoded text submitted to a Certificate Authority. It contains your public key and domain information. The CA uses it to issue the certificate.
What should I check in a CSR?
Check that the Common Name (CN) exactly matches the domain you want to secure. Verify the key size is at least 2048 bits for RSA. Make sure the organisation and country fields are correct before submitting to a CA.
What is a SAN entry?
Subject Alternative Names (SANs) allow a single certificate to cover multiple domains. Modern CSRs should include SAN entries rather than relying only on the CN. Most CAs now require at least one SAN matching the CN.