🔐 CSR Decoder
Paste a Certificate Signing Request (PEM format) to instantly decode all fields — subject, key info, SANs, fingerprints. Nothing leaves your browser.
About CSR Decoder
A Certificate Signing Request (CSR) is the file you submit when applying for an SSL/TLS certificate for your website or server. It contains encoded information about your organization and domain, but in raw PEM form it's completely unreadable. This tool decodes any CSR and displays all fields clearly — Common Name, organization, country, Subject Alternative Names (SANs), public key details, and fingerprints.
Invaluable when you need to verify a CSR before submitting it to a Certificate Authority, or when inspecting what a received CSR contains. Everything stays entirely in your browser — no data is sent to any server, which is exactly what you want when handling sensitive certificate files.