Convert Text to Hexadecimal Convert ASCII text to hexadecimal representation.

What Is ASCII to Hex?

This tool converts each character of plain text to its hexadecimal byte value. For example, 'A' becomes 41, 'Hello' becomes 48 65 6C 6C 6F. Hex is the standard way to represent byte values in programming and debugging. Each character in the 0–127 range maps to one byte. Characters outside that range are encoded as UTF-8 byte sequences. Output can be formatted with or without spaces and 0x prefix. All processing is client-side.

Why Use ASCII to Hex?

• Instantly convert any text to hexadecimal byte values
• Configurable output format with spaces and 0x prefix
• 100% client-side — data never leaves your browser
• Free online tool with real-time conversion

Common Use Cases

Programming

Get hex values for byte arrays and protocols.

Debugging

Inspect hex representation of strings.

Network Protocols

Convert text to hex for packet inspection.

Data Encoding

Represent text as hex for binary formats.

Technical Guide

Each character converts via charCodeAt(), formatted as 2-digit hex using toString(16).padStart(2, '0'). Multi-byte characters use TextEncoder for UTF-8 bytes first. Output formats include space-separated, 0x-prefixed, and continuous.

Tips & Best Practices

• 1
  ASCII characters produce exactly 2 hex digits
• 2
  Non-ASCII characters produce multiple hex bytes (UTF-8)
• 3
  Use space-separated format for readability
• 4
  0x prefix format is common in programming languages

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Convert binary numbers to decimal (base-10) representation.

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Frequently Asked Questions

Q Is this tool free?

Yes, completely free with no signup required.

Q Is my data secure?

Yes. All processing is 100% client-side.

Q Does it support Unicode?

Yes, non-ASCII characters are converted to UTF-8 hex bytes.

Q What browsers are supported?

All modern browsers including Chrome, Firefox, Safari, and Edge.

Q Can I choose the output format?

Yes, select space-separated, 0x-prefixed, or continuous hex.

About This Tool

ASCII to Hex is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.