Enter a value to begin.
Result
Byte preview:
Unicode and binary behavior
Encoding uses UTF-8 bytes, so emoji, accented text, Chinese, Japanese, Arabic, and surrogate pairs round-trip correctly. Non-UTF-8 decoded bytes are not rendered as text; a bounded hexadecimal preview and local binary download are offered instead.
Inert output and Base64URL
Decoded HTML, scripts, SVG, data URLs, and links remain inert text and are never executed or opened. Base64URL is an explicit mode using - and _ with optional omitted padding; it is not ambiguously auto-detected.
Examples and limits
Try aGVsbG8= to decode hello. All interactive processing remains browser-local.