ASCII Code to Character

Turn a list of ASCII / Unicode code points back into readable text

Input

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Output

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What is ASCII Code to Character

Last reviewed: April 18, 2026

ASCII (American Standard Code for Information Interchange) is a 7-bit character encoding that defines 128 characters, forming the historical basis for most modern encodings.

ASCII to Character is the reverse of Character to ASCII. You paste a space- or comma-separated list of decimal code points and the tool rebuilds the original Unicode string using String.fromCodePoint.

It is useful for reconstructing messages from debug logs, low-level sniffers, and CTF challenges that deliver payloads as lists of numeric codes.

Why use it

Rebuild strings captured as numeric sequences.
Solve CTF puzzles that publish challenge text as character codes.
Check that a test fixture encodes the expected characters.
Convert spreadsheet columns of char codes back to text.
Teach the inverse mapping between characters and code points.

Features

Accepts space or comma separated code points
Full Unicode range (0–0x10FFFF) supported
Emits a human-readable string
Runs offline once loaded, great for private ASCII Code to Character
Helpful for CTF decoding workflows

How to use ASCII Code to Character

Paste the list. Drop a space- or comma-separated list of decimal code points.
Click Run. Each code point becomes a character in the output.
Copy the text. Use the reconstructed string in your notes or test.

Example (before/after)

Decimal codes

72, 101, 108, 108, 111

Text

Hello

Common errors

Out-of-range codes

Valid Unicode code points are 0–0x10FFFF.

Fix: Remove or fix values above 1114111.

Mixed separators

Values can be space- or comma-separated, but not mixed with other punctuation.

Fix: Normalise the list to spaces or commas only.

Hex values

This tool expects decimal.

Fix: Convert hex codes to decimal first (Hex to Decimal) or use Hex to Text.

FAQ

Does this handle emoji?

Yes — the tool uses String.fromCodePoint and supports the full Unicode range.

What separators are allowed?

Spaces, commas, or tabs. Mix and match freely within the same list.

Does it handle hex values?

No — feed it decimal. Use Hex to Text for hex input.

What if a value is invalid?

The tool returns an error message with the offending token.

Is there a length limit?

No hard limit, but very long lists may be slow in older browsers.

Related tools

Pair this with Character to ASCII and with hex/binary converters for complete round-trips. You can also browse the full Encoders & Decoders category for more options.

Character to ASCII Code

Convert each character in a string to its ASCII / Unicode code point

ASCII to Decimal

Convert ASCII / Unicode text to a list of decimal character codes

Decimal to ASCII

Convert a list of decimal character codes to ASCII / Unicode text

Byte to ASCII

Convert space or comma separated byte values (0–255) to ASCII text

Hex to Text

Convert hexadecimal to text

Text to Hex

Convert text to hexadecimal

ASCII to Byte

Convert ASCII text into a list of byte values (0–255)

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