demo · v138

Uint8Array.{from,to}{Base64,Hex}

Native conversion between byte arrays and base64/hex strings. Type text, paste a hex string, paste base64 — round-trip whichever way you came in.

checking support…
base64 alphabet
Edit any field — the others update.

the code

const bytes = new TextEncoder().encode("Hello!");
const b64   = bytes.toBase64();                // "SGVsbG8h"
const hex   = bytes.toHex();                   // "48656c6c6f21"
const back  = Uint8Array.fromBase64(b64);      // Uint8Array(6) [...]
const text  = new TextDecoder().decode(back);  // "Hello!"
bytes.toBase64({ alphabet: "base64url" });     // URL-safe variant

see also