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ASCII Text to Hexadecimal Converter

Convert ASCII and UTF-8 text to hexadecimal byte codes, one byte per character, with the decimal value shown beside each for reference.

How to use it

  • Type text to convert to hex bytes.

Examples

Hi48 69

Every character in a string has an underlying numeric code (ASCII for standard English text, UTF-8 more broadly). This tool converts each character's code to its 2-digit hexadecimal form — the format used in hex dumps, byte editors and low-level data inspection.

'H' is ASCII 72, and 72 in hex is 48. 'i' is ASCII 105, which is 69 in hex.

Where this comes up

  • Preparing a hex string for a URL, API payload or firmware upload that expects hex-encoded text
  • Debugging serial or network data by comparing readable text against its hex byte representation
  • Computer science coursework linking character encoding to hexadecimal notation
Runs entirely in your browser. Nothing you type is uploaded, logged or shared.

Last updated 18 August 2026