CSR Decoder

Paste or upload a PEM-encoded Certificate Signing Request to inspect its subject, public key, SANs, and extensions.

Learn more

Drag & drop a file here, or click to browse

Supports .pem, .cer, .crt, .der, .csr, .p7b, .pfx, .p12

This tool runs entirely in your browser. No data is sent to any server, collected, or stored. Your input never leaves your device.