Convert a String to Bytes online for free

What is String to Bytes?

String to Bytes is a free online tool that converts any text string into its hexadecimal byte representation using UTF-8 encoding. It’s an essential utility for developers working with low-level data processing, network protocols, or debugging encoding issues.

Unlike simple ASCII converters, this tool correctly handles Multi-byte characters (like Chinese, Emojis, and special symbols) by generating the standard UTF-8 byte sequence.

Need to decode hex bytes back to text? Use our Bytes to String Converter.

How to use

1. Enter Text: Type or paste your string into the input box.
2. View Result: The hexadecimal byte sequence appears instantly in the output box.
3. Customize Format: Use the options to match your specific needs:
   • Use Full Bytes: Pads single-digit hex values with a leading zero (e.g., A becomes 0A).
   • Add Delimiter: Separates bytes with spaces for better readability.
   • Uppercase Output: Converts hex digits to uppercase (e.g., ff becomes FF).
   • Byte Prefix: Adds a custom prefix like 0x or \x to each byte (useful for programming arrays).

Examples

Why use String to Bytes?

1. Protocol Analysis

When debugging network packets or binary file formats, you often need to see the exact byte sequence of a string. Example: Verify what bytes are actually sent when you transmit “Login”.

2. Programming Setup

Quickly generate byte arrays for C, Python, or Java. Example: Convert “Error” to 0x45, 0x72, 0x72, 0x6f, 0x72 for a C array.

3. Encoding Debugging

Understand how different characters are stored in memory. Example: See the difference between ASCII characters (1 byte) and Emoji (4 bytes).

4. Python Compatibility

Generate hex strings compatible with Python’s bytes.fromhex() or string literals.

How it works

This tool utilizes the browser’s built-in TextEncoder API to perform standard UTF-8 encoding. This ensures 100% compatibility with modern web standards and programming languages. It takes the code points of your input characters and converts them into the corresponding 8-bit sequences defined by the Unicode standard.

FAQ

Is this compatible with Python?

Yes! If you set the Use Full Bytes option and remove delimiters, the output 48656c6c6f can be used directly in Python:

bytes.fromhex("48656c6c6f") # b'Hello'

Or use the Byte Prefix \x to create a string literal: b'\x48\x65\x6c\x6c\x6f'.

Does it support Chinese or Emojis?

Yes, it fully supports all Unicode characters via UTF-8 encoding. Characters like ‘你’ will be converted to e4 bd a0.

What is the maximum length?

The tool runs entirely in your browser, so the limit depends on your device’s memory. modifying or analyzing large text blocks is fast and secure—no data is sent to any server.