This tool converts plain text into Base64, the encoding scheme that represents any data using only 64 safe ASCII characters. Type or paste into the left editor and the encoded string builds itself in the right editor with every keystroke. The encoder is fully UTF-8 aware, so emoji, accented letters, and non-Latin scripts such as Japanese, Arabic, or Cyrillic all encode correctly instead of triggering the character-range errors that simpler encoders produce.
Base64 shows up wherever text has to travel through systems that only tolerate a narrow character set. Developers use it to embed small payloads inside JSON fields, to build the user:password string for an HTTP Basic Authentication header, to construct data URIs that inline content directly into HTML or CSS, and to store configuration values that would otherwise break on quotes, newlines, or special symbols.
The encoding runs entirely in your browser using JavaScript, so the text you type never leaves your device. Nothing is transmitted, logged, or stored on any server, and once the page has loaded the tool keeps working even if you disconnect from the internet. Closing the tab erases everything.
No. Base64 is an encoding, not encryption: it changes how data is represented, not who can read it. Anyone can reverse it instantly with a decoder, so never rely on Base64 to protect passwords, API keys, or any other secret.
Base64 represents every 3 bytes of input as 4 output characters, which adds roughly one third to the size. If the input length is not a multiple of three, the output is also padded with one or two equals signs at the end.
Yes. The tool first converts your text to UTF-8 bytes and then encodes those bytes, so multi-byte characters like emoji or Chinese script round-trip correctly. Simpler encoders built directly on the browser's btoa function fail on these characters.