ASN.1 Encoder/Decoder
Convert ASN.1 DER between Base64/PEM and hex. Runs entirely in your browser.
Input
Output
Conversions happen locally. No data leaves your browser.
Base64 & hex
Convert DER between Base64/PEM and hex byte strings.
Normalize PEM
Strips headers/footers and whitespace for cleaner outputs.
Copy or download
Copy results or download them for later use.