Digital Conversion
Translate readable text into its UTF-8 byte sequence, or turn valid binary bytes back into text. The converter handles more than ASCII, including accented letters, CJK characters, and emoji.
Each group is one 8-bit UTF-8 byte. Paste either space-separated bytes or one uninterrupted bit stream; malformed byte groups and invalid UTF-8 are rejected.
Binary is a notation for bits, while UTF-8 is the rule that maps Unicode text to bytes. This converter applies the browser TextEncoder to produce UTF-8, then shows each byte from most significant bit to least significant bit. A plain ASCII A is decimal 65, hexadecimal 41, and binary 01000001. Spaces in the output separate bytes for reading; they are not bits in the underlying data.
Non-ASCII characters often occupy several bytes. The letter é is UTF-8 C3 A9, displayed here as 11000011 10101001. A Chinese character or emoji commonly needs three or four bytes. Counting groups therefore counts bytes, not letters, grapheme clusters, or visible symbols. A combining mark can make even one apparent letter span multiple Unicode code points.
For decoding, the input must use only 0 and 1 plus whitespace. A single uninterrupted stream is split every eight bits; if you insert whitespace, every token must already be exactly eight bits. A seven-bit fragment, a digit 2, or an incomplete final byte is rejected rather than silently padded. The decoder also rejects invalid UTF-8 sequences instead of replacing them with the replacement character.
Round-trip text by encoding it, swapping direction, and decoding the resulting byte groups. UTF-8 preserves Unicode scalar values, but TextEncoder replaces an isolated JavaScript surrogate with U+FFFD because that isolated code unit is not valid Unicode text. The tool is for text bytes, not arbitrary binary files, integers in two’s complement, or a full text-encoding detector.
| Example | Result | Why it matters |
|---|---|---|
| A | 01000001 | One ASCII-range character uses one UTF-8 byte. |
| é | 11000011 10101001 | One visible letter occupies two UTF-8 bytes. |
| 01000001 01000010 | AB | Whitespace separates complete bytes; a continuous 16-bit stream also works. |
| 11111111 | Invalid UTF-8 | A well-formed eight-bit group is not necessarily valid encoded text. |
Compare a documented UTF-8 text payload with the byte values in a log or network trace.
Show why Unicode characters may take multiple bytes even though ASCII characters fit in one byte.
Spot an incomplete byte group before copying a binary representation into another tool.
This converter cannot infer whether unknown bytes were originally Latin-1, Windows-1252, or another encoding. It deliberately accepts only valid UTF-8 text.
UTF-8 encodes many emoji as four bytes, so the display has four eight-bit groups. One displayed symbol is not the same as one byte.
Yes. The complete stream must contain a multiple of eight bits, and each eight-bit slice is interpreted as a byte.
The bytes may not form a valid UTF-8 sequence. For example, FF is not a legal UTF-8 leading byte.
The conversion code runs in the browser. Avoid pasting sensitive material into any page unless your own security policy permits it.
Last reviewed: October 26, 2026. This tool runs in your browser. Verify important data against its source format and encoding.
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