Base64 is a binary-to-text encoding scheme that converts binary data into a set of 64 printable ASCII characters. It is widely used in web development, email attachments (MIME), data URIs, and API authentication tokens. When you encode data in Base64, every three bytes of input are represented as four characters of output, making it roughly 33 percent larger than the original but completely safe for text-based transport channels that do not handle raw binary.

Our free online Base64 encoder and decoder supports full Unicode (UTF-8) text, so you can safely encode strings containing special characters, emojis, or non-Latin scripts. Simply paste your text, click Encode or Decode, and copy the result. No data is sent to any server — everything runs entirely in your browser for maximum privacy and speed.