Base64 Encoder/Decoder
About Base64 Encoder/Decoder
Base64 is a binary-to-text encoding scheme that represents binary data using a set of 64 printable ASCII characters. Originally designed to safely transmit binary data over text-based protocols, Base64 has become an essential tool for developers working with web applications, APIs, and data interchange formats.
This free online Base64 encoder and decoder provides instant conversion between plain text and Base64 format. Whether you need to encode authentication credentials for HTTP headers, embed images directly in HTML or CSS, or decode Base64 data received from an API, this tool handles it effortlessly with full UTF-8 character support.
The encoding process works by taking groups of three bytes (24 bits) and converting them into four Base64 characters. This means encoded data is approximately 33% larger than the original, but the trade-off is worthwhile when you need to embed binary content in text-based systems. Common use cases include encoding images for data URIs, encoding JSON Web Tokens (JWT), and preparing data for URL parameters.
All processing happens locally in your browser using JavaScript. Your data never leaves your device, ensuring complete privacy and security. The tool uses the standard TextEncoder and TextDecoder APIs to properly handle UTF-8 characters, so you can safely encode and decode text in any language.