Base64 encoder and decoder

Encode and decode Base64, including the URL-safe alphabet used in JWTs. Handles multi-byte UTF-8 correctly, which the usual one-line browser implementations do not.

EncodeDecode

URL-safe alphabet (no padding)

Text to encode

Runs entirely in your browser. Nothing is uploaded, stored or logged — worth knowing, since the usual reason to reach for this is a Kubernetes secret.