WebToolsPlanet
Converter Tools

String to Hex

Type or paste a string and convert it into hexadecimal UTF-8 bytes instantly. Use separators that fit code samples, payloads, or documentation.

Last updated: May 30, 2026

Client-Side Processing
Input Data Stays on Device
Instant Local Execution
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What is String to Hex?

String to hex conversion shows the byte-level hexadecimal representation of text. The input string is encoded as UTF-8 bytes, then each byte is written as two hex digits from 00 to FF. For ordinary ASCII text, each character becomes one byte. For Unicode text, accented letters and emoji may use multiple bytes.

Developers use string-to-hex conversion when documenting binary payloads, preparing protocol examples, debugging encoded data, checking UTF-8 byte sequences, and creating test fixtures where raw bytes are easier to read in hexadecimal than in binary.

How to Use String to Hex

1

Type or paste the string you want to encode

2

Choose a separator: space, comma, or newline

3

Review the generated hexadecimal byte values

4

Copy the hex output or download it as a text file

5

Use Hex to String or Hex to UTF8 to decode the bytes back

Common Use Cases

  • Encoding short text payloads as hex byte lists for protocol documentation.
  • Checking the UTF-8 byte sequence for accented characters, symbols, or emoji.
  • Creating test fixtures for parsers that consume hexadecimal byte input.
  • Preparing CTF or puzzle strings where a message is hidden in hex.
  • Verifying that a hex decoder recovers the original string exactly.

Example Input and Output

The string WebTools is encoded as one two-digit hex value per UTF-8 byte.

Input string
WebTools
Hex bytes
57 65 62 54 6F 6F 6C 73

Privacy

String-to-hex encoding is fully client-side. Your text is not sent to a server.

Two digits per byte

Hexadecimal is base 16, so every byte from 0 to 255 is represented by exactly two digits from 00 to FF.

Frequently Asked Questions

Does this encode text as ASCII or UTF-8?

The tool uses UTF-8. ASCII characters produce the same byte values as ASCII, while Unicode characters may produce multiple bytes.

Why does an emoji produce several hex bytes?

UTF-8 uses multiple bytes for characters outside the basic ASCII range. Emoji commonly use four bytes.

Can I choose separators between bytes?

Yes. Use spaces, commas, or newlines depending on whether you need readable text, list-style output, or one byte per line.

How do I decode the output?

Paste the generated bytes into the Hex to String or Hex to UTF8 tool to recover the original text.

Is my string uploaded?

No. Encoding happens locally in your browser and the input stays on your device.

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