What is ASCII to hex conversion?

Every ASCII character has a numeric code point (0–127 for standard ASCII). Converting to hex means expressing that code point in base-16. For example, "A" has code point 65, which is 41 in hexadecimal.

Does this handle characters outside standard ASCII?

Extended characters (code points 128–255) are converted using their byte value. Characters above 255 (Unicode) are not supported — they will be flagged in the output.

What does the space delimiter option do?

With the delimiter enabled, each two-digit hex pair is separated by a space (e.g., "48 65 6c 6c 6f"). Without it, the pairs are joined together (e.g., "48656c6c6f").

Is my data sent to a server?

No. All conversion happens locally in your browser using JavaScript. Nothing is transmitted to any server.

How do I reverse this conversion?

Use the companion Hex to ASCII tool to decode hex strings back to readable text.

ASCII to Hex Converter

Type or paste ASCII text and instantly get the hexadecimal representation with options for spacing and case.

ASCII Input

Space between bytes Uppercase (A–F)

Try a sample

Hex Output

Enter ASCII text and click Convert

Copied!

Summary

This tool converts plain ASCII text into its hexadecimal (base-16) representation. Each character is mapped to its ASCII code point, then rendered as a two-digit hex value. You can choose to separate hex pairs with spaces, and toggle between uppercase and lowercase letters. All conversion happens entirely in your browser — no data is sent to any server.

How it works

Type or paste your ASCII text into the input field.
Each character is converted to its ASCII code point (decimal).
The decimal code point is formatted as a two-digit hexadecimal value.
Optionally enable the space delimiter to separate each hex pair.
Toggle uppercase to get A–F instead of a–f in the output.
Use the Copy button to copy the hex result to your clipboard.

Use cases

Encode text strings for use in low-level protocols or binary formats.
Prepare hex payloads for network packet crafting and security testing.
Debug and inspect character encoding in software development.
Convert strings to hex for use in CSS content properties or SQL literals.
Encode messages for CTF (Capture the Flag) challenges.
Verify correct ASCII encoding of config values or tokens.

Frequently Asked Questions

Last updated: 2026-05-23 · Reviewed by Nham Vu