Skip to main content

​
ASCII to Hex

Convert ASCII text to hexadecimal byte representation. Encodes input as UTF-8 and outputs space-separated hex values.

​
Overview

The ASCII to Hex tool encodes text to hex bytes:
  • Input: Any text (ASCII, UTF-8, Unicode)
  • Output: Space-separated lowercase hex bytes
Encoding uses UTF-8, so multi-byte characters (emoji, accented letters) produce multiple hex values.

​
Use Cases

Protocol construction

Build hex payloads for network protocols or embedded systems

Data embedding

Encode strings as hex literals for C, assembly, or configuration files

Debugging

Inspect byte-level representation of text data

Cryptographic input

Prepare text for hex-based hashing or encryption tools

​
Input Format

Paste any text. Unicode and multi-byte characters are supported.
Example
Hello World

​
Output

Space-separated lowercase hexadecimal bytes with byte count metadata.
Input:
Hello
Output:
48 65 6c 6c 6f
Meta:
5 bytes (UTF-8)
Input:
☕
Output:
e2 98 95
Meta:
3 bytes (UTF-8)
The coffee emoji (U+2615) encodes to 3 bytes in UTF-8.

​
Implementation Details

The tool uses TextEncoder to convert the input string to UTF-8 bytes, then formats each byte as a two-digit lowercase hex string. Source: lib/tools/engine.ts:962-966
Key logic
const bytes = new TextEncoder().encode(input);
return Array.from(bytes).map((b) => b.toString(16).padStart(2, '0')).join(' ');
The output is always lowercase hex. For uppercase, manually convert the output or use a text case tool.

​
Character Encoding

Single-byte characters map directly to hex:
  • A → 41
  • 0 → 30
  • \n → 0a
Characters like é, ñ encode to 2 bytes in UTF-8:
  • é → c3 a9
Multi-byte characters (emoji, CJK, etc.) encode to 2-4 bytes:
  • 🔥 (U+1F525) → f0 9f 94 a5
For decoding hex back to ASCII, use the Hex to ASCII tool.

​
Keyboard Shortcuts

  • Cmd/Ctrl+Enter — Convert ASCII to hex
  • Cmd/Ctrl+Shift+C — Copy output
  • Cmd/Ctrl+Shift+S — Download output

Hex to ASCII

Reverse operation: convert hex bytes to ASCII text

Base64 String Encode/Decode

Encode/decode Base64 strings

String Inspector

Analyze byte length, encoding, and character frequency

Build docs developers (and LLMs) love

Get started for freeTalk to us