UTF-8 Encoder - Convert Text to UTF-8 Bytes (Hex, Binary, Decimal)

Q: What is the difference between UTF-8 bytes and ASCII codes?

For plain English characters they are identical, one byte each, matching the ASCII value. The difference shows up with anything beyond basic ASCII: a character like the euro sign is a single Unicode character but three UTF-8 bytes. This tool shows those bytes; an ASCII converter shows one code per character.

Q: Is this the same as URL encoding?

They are related but not identical. URL (percent) encoding is UTF-8 bytes written as %XX for unsafe characters. You can imitate it here by choosing hex output with a % prefix and no separator.

Text

UTF-8 bytes

Need the reverse? UTF-8 bytes to text

Output format

Separator

Prefix each byte

Hex case

Sample Copy bytes Download Open file Clear

About the UTF-8 Encoder

What is a UTF-8 encoder?

UTF-8 is the encoding that runs the modern web — the agreed way to store every character, from a plain A to the euro sign to an emoji, as a sequence of bytes. A UTF-8 encoder shows you those bytes. Type some text and this tool reveals the exact byte sequence, in hexadecimal, binary or decimal, that a computer would save to disk or send over the network.

The clever part of UTF-8 is that it's variable width: ordinary English letters take a single byte, while accented characters, symbols and emoji use two, three or four. This encoder uses your browser's built-in TextEncoder, so the output is always accurate — and it never sends your text anywhere.

How to Use This Tool

Enter your text. Type in the left box, paste, or open a .txt file.
Pick a format. Hexadecimal, binary or decimal for the byte values.
Style the output. Choose the separator between bytes, add a prefix like 0x or %, and set uppercase or lowercase hex.
Copy or download. The bytes update live — copy them or save them as a file.

How UTF-8 sizes characters

Character	Code point	Bytes	UTF-8 (hex)
`A`	U+0041	1	41
`é`	U+00E9	2	C3 A9
`€`	U+20AC	3	E2 82 AC
`✨`	U+2728	3	E2 9C A8
`😀`	U+1F600	4	F0 9F 98 80

Common Use Cases

Debugging encoding bugs: See why a character shows up as mojibake by inspecting its real bytes.
Networking & protocols: Prepare byte sequences for HTTP, sockets or binary formats.
Escaping strings: Produce \x or %-style byte escapes for code and URLs.
Learning Unicode: Watch how one to four bytes represent different characters.

Need to read bytes back into text? Use the UTF-8 Decoder. Want per-character codes instead of raw bytes? Try the Text to ASCII Converter.

Frequently Asked Questions

What is the difference between UTF-8 bytes and ASCII codes?

For plain English characters they're identical — one byte each, matching the ASCII value. The difference shows up with anything beyond basic ASCII: a character like € is a single Unicode character but three UTF-8 bytes. This tool shows those bytes; an ASCII converter shows one code per character.

Which output formats are available?

Hexadecimal, binary and decimal. You can choose the separator between bytes, add a prefix to each byte, and pick uppercase or lowercase for hex.

Does it handle emoji and non-English text?

Yes. UTF-8 covers the whole Unicode range, so emoji, accented letters and scripts like Arabic, Chinese or Cyrillic all encode correctly into their two-, three- or four-byte sequences.

Is this the same as URL encoding?

They're related but not identical. URL (percent) encoding is UTF-8 bytes written as %XX for unsafe characters. You can imitate it here by choosing hex output with a % prefix and no separator.

Is my text uploaded anywhere?

No. Encoding happens entirely in your browser using the native TextEncoder API, so your text never leaves your device.