ASCII to Hex Converter

Type or paste any text and get its hexadecimal byte representation, formatted as neat space-separated byte pairs ready for a hex editor or protocol spec.

What is the ASCII to Hex Converter?

The ASCII to Hex Converter encodes plain text into hexadecimal byte pairs, one pair per character (or per UTF-8 byte for non-ASCII characters). It's the mirror image of a hex dump: instead of reading raw bytes as text, you start with text and see exactly which bytes represent it.

How It Works

Each line of input is encoded to UTF-8 bytes, and every byte is converted to a two-digit uppercase hex pair separated by a space. Because UTF-8 encoding is used rather than a simple character-code lookup, accented letters, symbols and other non-ASCII characters are still represented correctly as the multi-byte sequences a real system would send.

Real-World Use Case

Building or testing an API that expects a hex-encoded payload often means manually converting a plain string like a device ID or command name into bytes — typing it here instantly produces the exact byte sequence to paste into your request.

Frequently Asked Questions

Does spacing or punctuation in my text cause problems?

No. Every character, including spaces and punctuation, is encoded to its own byte or bytes, so the hex output represents your text exactly, spaces included.

How are non-English characters handled?

They're encoded as UTF-8, which represents many characters using two, three or four bytes instead of one, so the hex output will be longer for accented or non-Latin text than for plain ASCII of the same length.

Can I convert multiple lines of text separately?

Yes. Each line you enter is treated as its own message and hex-encoded on its own line in the result, keeping every message distinct.

Need to go back to text from hex? The reverse converter decodes hex byte pairs into readable text. Looking for the reverse? Try the Hex to ASCII Converter →