Base64 is a data representation format that translates binary data or unprintable characters into a standard ASCII string. It is widely used to embed images directly into HTML/CSS files (Data URIs), safely transmit data over HTTP, or store complex data in JSON format without breaking the syntax.
Absolutely not. All encoding and decoding operations in this tool are executed 100% on your device using JavaScript running inside your browser. No text data or image files are ever uploaded or saved to any external server.
This happens when the Base64 string was not encoded using a UTF-8 aware mechanism. Our tool leverages a modern engine that seamlessly converts strings to UTF-8 bytes before encoding, ensuring that emojis, Korean, Chinese, and other Unicode characters remain perfectly intact upon decoding.