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ASCII to Text Converter

Convert ASCII codes — decimal, hex, or octal — to their readable text representation in one click.

Last updated: May 29, 2026

Client-Side Processing
Input Data Stays on Device
Instant Local Execution
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What is ASCII to Text Converter?

ASCII (American Standard Code for Information Interchange) assigns a numeric code to every character. This tool performs the reverse: given a list of ASCII codes, it produces the corresponding text string.

It supports three common input formats: - **Decimal** (e.g., 72 101 108 108 111) — the standard decimal ASCII table - **Hexadecimal** (e.g., 48 65 6C 6C 6F) — used in hex editors and protocol dumps - **Octal** (e.g., 110 145 154 154 157) — used in older Unix tools and C string literals

This converter is useful for students studying encoding, developers debugging protocols, security researchers reading encoded payloads, and engineers working with embedded or serial communication systems.

How to Use ASCII to Text Converter

1

Choose your input format: Decimal, Hex, or Octal

2

Paste or type your ASCII codes into the input field, separated by spaces or commas

3

The ASCII characters are converted instantly in the output panel

4

Click "Copy" to copy the text or "Download" to save as a .txt file

5

Click "Load Sample" to see a working example

Common Use Cases

  • Converting decimal ASCII code sequences from documentation or textbooks to readable text.
  • Reading hex-encoded ASCII payloads from HTTP headers or network packets.
  • Translating octal ASCII escapes from C-style string literals in source code or logs.
  • Educational exercises where students decode ASCII messages as part of a lesson.
  • CTF (Capture the Flag) security challenges that involve encoding text as ASCII codes.
  • Debugging embedded firmware that outputs character codes as numeric values over serial.

Example Input and Output

A series of decimal ASCII codes is converted to the text "Hello!" using the decimal format.

ASCII codes (decimal)
72 101 108 108 111 33
Text output
Hello!

Privacy

All ASCII-to-text conversion runs in your browser. No data is uploaded.

Octal in C strings

In C, octal escape sequences are written as \nnn (e.g., \110 \145 \154 \154 \157 for "Hello"). Paste just the numeric parts (without backslashes) into this tool and choose Octal mode.

Frequently Asked Questions

What input formats are supported?

Decimal (standard), hexadecimal (base-16), and octal (base-8). For hex input, you can write 48 or 0x48. For octal, 110 or 0o110. Separate values with spaces or commas.

What is the difference between ASCII to Text and Byte to ASCII?

"ASCII to Text" emphasises the conversion of ASCII code numbers to the text string they represent. "Byte to ASCII" uses the same underlying conversion but frames it as raw byte processing. The math is identical for values 0–127.

What happens with codes 128–255?

Codes 128–255 are in the extended ASCII range (Latin-1 supplement). They are converted using String.fromCharCode() which follows the Unicode Latin-1 block. The displayed characters may differ across fonts and systems.

Can I convert hex ASCII codes without the 0x prefix?

Yes. When you select the Hex input format, the tool parses each value as hexadecimal whether or not it has a "0x" prefix.

Is my data processed in the browser?

Yes. All conversion happens locally in your browser. No data is sent to any server.

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