Base64 Encode/Decode

Base64 is an encoding scheme that converts binary data into a sequence of ASCII-safe characters. Every three bytes of input are represented as four characters from the Base64 alphabet — uppercase and lowercase letters, digits, and the symbols `+` and `/`. The output is about 33% larger than the original data, but can be transmitted safely through any system that handles plain text without risking corruption.

To use the tool, choose your mode. In **Encode** mode, paste or type the text you want to encode and the Base64 output appears instantly. In **Decode** mode, paste a valid Base64 string to recover the original text. A copy button lets you transfer the result to your clipboard in one click.

The most common use cases involve web development and APIs: embedding images directly in CSS or HTML as Data URLs, transmitting authentication tokens in HTTP headers, storing basic credentials in the format `Authorization: Basic ...`, encoding JSON payloads before including them in query strings, and debugging API responses that return fields in Base64.

All conversion happens entirely in the browser using JavaScript's native `btoa` and `atob` functions. No data is sent to any server and no account or installation is required.