Text to Hex
Convert text to hexadecimal using real UTF-8 — emoji and accented or CJK characters are byte-correct. Live, with case, separator and 0x options plus an xxd-style hex dump.
About this ToolHow it works, benefits & use casesTap to collapse
Convert any text into its hexadecimal byte representation using real UTF-8 encoding, so emoji, accented letters, and CJK characters produce byte-correct hex rather than truncated values. You control the output format precisely: choose lowercase or uppercase hex digits, pick a separator (none, space, colon, comma, or one byte per line), and optionally prefix every byte with "0x". A live UTF-8 byte count updates as you type, and an xxd-style hex dump panel shows the offset, hex columns, and an ASCII gutter so you can read the raw bytes alongside the formatted output. Because the encoding is true UTF-8 — built on TextEncoder — a four-byte emoji yields four hex bytes, exactly matching what a server or file would store. One click swaps you to the Hex → Text decoder to round-trip the result, and the whole conversion is captured in a shareable URL. Everything runs locally in your browser with no upload.
How to Use
- 1Open Output format and pick a separator (none, space, colon, comma, or newline) and lowercase or uppercase digits.
- 2Optionally tick "0x prefix" to prepend 0x to each byte.
- 3Type or paste your text into the input — the hex output and a UTF-8 byte count update live.
- 4Click "Convert to Hex" to confirm, and check the xxd-style hex dump below to inspect the bytes.
- 5Copy or download the hex, share the link, or click "Swap to Hex → Text" to reverse it.
Key Benefits
- True UTF-8 encoding — emoji, accents, and CJK become byte-correct hex
- Choose none, space, colon, comma, or newline separators
- Lowercase or uppercase hex digit output
- Optional 0x prefix on every byte
- Live UTF-8 byte count as you type
- Built-in xxd-style hex dump with offsets and an ASCII gutter
- One-click swap to the Hex → Text decoder and a shareable URL
Common Use Cases
- Producing a byte-accurate hex representation of a UTF-8 string for tests
- Generating colon- or space-separated hex for documentation or wire formats
- Checking how many bytes a string occupies in UTF-8
- Creating a 0x-prefixed byte list to paste into source code
- Inspecting the exact bytes of multi-byte characters while debugging
Output format
Prepend 0x to every byte (e.g. 0x48 0x65)
0 UTF-8 bytes · live
Enter text above to see its hexadecimal form.
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Yes. It encodes text as UTF-8 using TextEncoder, so a character that takes several bytes — such as an emoji (4 bytes) or a CJK character (3 bytes) — produces the correct number of hex bytes. This matches how the string is actually stored on disk or sent over the network, unlike a naive converter that emits one value per character.
You can join the hex bytes with nothing ("48656c"), spaces ("48 65 6c"), colons ("48:65:6c"), commas ("48,65,6c"), or newlines (one byte per line). Pick whichever matches the format you are pasting into — colons for MAC-style notation, spaces for readable dumps, none for compact strings.