Text to hex
Plain text
Hi
Hex
48 69
Hex Text Converter
Convert plain text to spaced UTF-8 hex bytes—or decode hex dumps, 0x-prefixed strings, and continuous hex back to readable text.
Hex Text Converter
Encode UTF-8 bytes as hex or decode hex strings back to text.
Plain text or hex string
Hex or decoded text
Input: 0 chars
Output: 0 chars
Bytes: 0
Hex pairs: 0
Invalid groups: 0
Status: ready
Your text stays in your browser — nothing is uploaded.
How to Use
- Choose Text to Hex or Hex to Text, then pick UTF-8 or ASCII encoding mode.
- Set spacing, uppercase/lowercase output, and optional 0x prefix.
- Paste plain text or hex like
48 65 6C 6C 6For continuous48656c6c6f. - Use Swap ↔ to verify round-trip conversion, then copy or download the result.
Example
Text
Hello
Hex bytes (UTF-8)
48 65 6C 6C 6F
Before and After Examples
Hex to text
Hex
41
Plain text
A
Continuous hex decode
Hex
48656c6c6f
Plain text
Hello
0x prefix decode
Hex
0x48 0x69
Plain text
Hi
Unicode example
Plain text
café
Hex (UTF-8)
63 61 66 C3 A9
Invalid hex warning
Input
48 G9
Result
Error — G is not a hex digit
Hex Reference
Each UTF-8 byte appears as two hexadecimal digits. ASCII characters use one byte each.
Uppercase A–C
A → 41
B → 42
C → 43
Lowercase a–b
a → 61
b → 62
Digits & space
0 → 30
1 → 31
Space → 20
Hex Examples
Hi
48 69
Hello
48 65 6C 6C 6F
A
41
Space
20
123
31 32 33
café
63 61 66 C3 A9
What This Tool Does
Hex Text Converter encodes each UTF-8 byte as two hexadecimal digits and decodes spaced, continuous, or 0x-prefixed hex back into readable text. Live validation flags non-hex characters, odd-length strings, and invalid byte groups.
ASCII vs UTF-8 in Hex
ASCII bytes
Basic English letters, digits, and symbols use one byte each—A is 41, space is 20.
UTF-8 compatibility
UTF-8 uses the same single-byte hex values for ASCII characters.
Accented letters
Non-ASCII characters use multiple bytes. The letter é in UTF-8 is C3 A9, not one byte.
Emoji expansion
Emoji often produce four or more hex byte pairs because their Unicode code points need multiple UTF-8 bytes.
How Text Becomes Hex
Character
Each character is encoded as one or more bytes using UTF-8 rules.
Byte
One byte is shown as two hex digits—values from 00 to FF.
UTF-8
Non-English characters may expand to multiple byte pairs in the output.
Spaces
A space character encodes as 20—just like any other byte.
Emoji
Emoji usually produce multiple hex byte pairs because UTF-8 stores them as several bytes.
Common Uses
Computer science lessons
Debugging byte data
CTF puzzles
API payload inspection
Color code learning
Firmware/log dumps
UTF-8 learning
Classroom activities
Popular Workflows
Notes & Limitations
All conversion runs locally in your browser. ASCII mode skips characters above code point 127. This tool converts text bytes—it does not parse color pickers or image files.
Frequently Asked Questions
Are spaces required between hex bytes?
No. Spaced output like 48 69 is easier to read, but continuous strings like 48656c6c6f also decode correctly.
Can I decode continuous hex?
Yes. Paste a continuous hex string with no spaces—the tool splits it into byte pairs automatically.
What is 0x hex format?
0x is a common prefix marking hexadecimal values, as in 0x48 0x69. Enable the 0x prefix option to encode or decode this format.
Uppercase or lowercase hex?
Both decode correctly. Use the case toggle to choose uppercase (6C) or lowercase (6c) output when encoding.
What is ASCII?
ASCII maps English letters, digits, and common symbols to numbers 0–127, each stored in one byte.
What is UTF-8?
UTF-8 encodes Unicode characters as one or more bytes. ASCII characters still use one byte; emoji and accented letters use more.
Why does é become C3 A9?
The letter é has a Unicode code point beyond ASCII. UTF-8 represents it as two bytes: C3 and A9.
Why do emoji create many bytes?
Emoji code points are large numbers. UTF-8 stores them as multiple bytes, so one emoji may produce four or more hex pairs.
What happens with invalid hex?
Characters outside 0–9 and A–F trigger a friendly error. Odd-length hex strings show a warning when validation is enabled.
Can I decode hex back to text?
Yes. Select Hex to Text, paste your hex, and the decoded UTF-8 string appears instantly. Use Swap ↔ to reverse direction.
Is my text uploaded?
No. All encoding and decoding runs locally in your browser—nothing is sent to a server.
Can I download the result?
Yes. Click Download .txt to save the output panel contents as a plain-text file.