JavaScript base64/base64url encoder/decoder Source Code

Encode and decode text to/from base64 and base64url, as per RFC-4648. Text is first converted from JavaScript UCS-2 string encoding to UTF-8. This source code is in the public domain. You may use, share, modify it freely, without any conditions or restrictions.

Download source code:

• base64.js

See it in action, try it online now:

• base64 encoder
• base64url encoder
• base64/base64url decoder

See also JavaScript source code for CRC-32, Luhn.

Source Code