Convert Arbitrary Base to UTF-8

Yes. The decode runs entirely in your browser – nothing is uploaded, cached, or tracked. After the page loads you can disconnect the network and the tool keeps working.

Yes, 100% free with no cap on how much you can decode. No sign-up, no premium tier, no watermark.

Yes. HTML, CSS, and JavaScript are self-contained. Once the page has loaded, you can turn off Wi-Fi and keep decoding – ideal for air-gapped or locked-down environments.

Every integer base from 2 to 36 inclusive. The most common are 2 (binary), 8 (octal), 10 (decimal), and 16 (hexadecimal). Base 36 uses digits 0-9 and letters a-z, giving the widest token space.

Each token must be a byte in the range 0-255. The whole byte sequence is then decoded as UTF-8, which means a multi-byte codepoint (like 中 = e4 b8 ad) needs its three bytes in order – one token per byte.

The ASCII variant treats each token as a code point (so 128512 base 10 → 😀). This tool treats each token as a byte, so emoji come from their multi-byte UTF-8 sequence instead of a single large number. Pick whichever matches your source data.

Any mix of spaces, tabs, commas, or newlines. The tokenizer splits on [s,]+, so CSV pastes, terminal output, and hex-dump copies all work without preprocessing.

Bytes that do not form a valid UTF-8 sequence are replaced with the Unicode replacement character U+FFFD (⸮). The stats line reports how many replacements were inserted, so you can spot a corrupted paste fast.

Yes. UTF-8 covers the full Unicode range, including emoji, CJK characters, Devanagari, Arabic, and historic scripts. As long as your input preserves the correct byte order, the output renders natively.

Use the sibling UTF-8 to Arbitrary Base converter. Both tools share the same separator rules, so the output of one pastes cleanly into the other for a round-trip check.