Certificate Tool Decoded on the server using built-in .NET X.509 APIs

X.509 Certificate Decoder

Decode an X.509 certificate (PEM or DER) and inspect subject, issuer, validity, extensions, and thumbprints.

Certificate (PEM)

Paste a PEM-encoded certificate, or upload a .crt / .cer / .pem / .der file.

Or upload a file (.pem .crt .cer .key .csr)

Result