Certificate Decoder

Paste or upload a PEM-encoded certificate to decode and inspect all its fields.

Certificate

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.