Does the input need spaces between hex pairs?

No. You can enter hex with or without spaces, commas, or 0x prefixes. "48656c6c6f", "48 65 6c 6c 6f", and "0x48, 0x65, 0x6c" all decode correctly.

What counts as an invalid hex pair?

Any two-character group that contains a character outside 0-9 and A-F (case-insensitive) is invalid. A single leftover character after pairing is also flagged.

Are non-printable characters decoded?

Yes — but they are shown as a placeholder (·) and the pair is highlighted in amber to indicate a non-printable byte.

Is there a size limit?

The converter works entirely in your browser with no server round-trip. Very large inputs (hundreds of KB) may slow down the display slightly, but there is no hard limit.

Hex to ASCII Converter

Paste hex values and instantly decode them to readable ASCII text, with non-printable bytes clearly marked.

Hex Input

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ASCII Output

Enter hex values on the left to decode

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Summary

Converts hexadecimal byte sequences back to readable ASCII text. Accepts hex input with or without spaces, commas, or 0x prefixes — for example "48 65 6C 6C 6F" or "48656c6c6f" both decode to "Hello". Non-printable bytes are highlighted in amber, while malformed hex input is rejected with an error.

How it works

Paste your hex into the input box — spaces, commas, colons, and 0x prefixes are all accepted.
The tool strips delimiters and groups the characters into two-digit pairs, one byte each.
Each pair is converted from base-16 to its decimal ASCII code (0–127).
The code maps to its ASCII character; printable bytes (32–126) show as text, non-printable bytes are flagged and shown as a placeholder.

Use cases

Decode hex-encoded strings from logs, network captures, or debugger output.
Verify hex output produced by encoding tools.
Quickly translate ASCII art or text stored as raw hex bytes.
Learn the relationship between ASCII character codes and their hex representations.

Frequently Asked Questions

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