A malformed CSR can cause your Certificate Authority (CA) to reject the certificate request, delaying the issuance process. Verifying your CSR ensures that it contains the correct data and complies with current CA/B Forum requirements.

The tool analyzes your CSR for:

• Common Name (CN) – whether the main domain is correct,
• Subject Alternative Names (SAN) – whether all additional domains/subdomains are included,
• Algorithm and key length – e.g., RSA 2048/4096 bits or ECDSA,
• Organization (O) and Organizational Unit (OU) – required for OV/EV certificates,
• Compliance with CA/B Forum technical standards.

Typical mistakes include:

• Incorrect domain name (e.g., example.net instead of example.com),
• Missing SAN entries for multi-domain certificates,
• Using an outdated or weak key (RSA 1024 bits),
• Missing organization details for OV/EV validation,
• Unsupported or deprecated encryption algorithms.

Yes. A CSR is not tied to a specific CA. You can use it with any Certificate Authority as long as the data inside it (CN, SAN, and key parameters) are valid and meet the CA’s requirements.

Yes. You can check a CSR at any time – even after your SSL certificate has been issued. The CSR Checker allows you to confirm exactly what information was submitted to the CA during issuance.

If the CSR verification fails, you should generate a new one with corrected data – such as the proper domain name or a longer RSA key. HEXSSL provides a free CSR Generator that lets you quickly create a compliant CSR file.