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Decimal to ASCII Converter

Enter decimal ASCII code numbers separated by spaces or commas and instantly see the corresponding ASCII characters.

Last updated: May 29, 2026

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

The ASCII (American Standard Code for Information Interchange) standard assigns a unique decimal number to every character. For example, decimal 65 is "A", decimal 97 is "a", decimal 48 is "0", and decimal 32 is a space.

This tool converts a list of decimal ASCII codes back into their character representations. It is useful for developers reading raw protocol data, students studying character encoding, or anyone who encounters decimal-encoded text in data files, log outputs, or network captures.

Standard ASCII covers codes 0–127. Extended ASCII (128–255) includes additional characters from the Latin-1 supplement. This converter handles the full range.

How to Use Decimal to ASCII Converter

1

Enter decimal ASCII codes in the input field, separated by spaces or commas

2

The tool converts them to ASCII characters instantly

3

Click "Copy" to copy the result to your clipboard

4

Click "Download" to save it as a .txt file

5

Click "Load Sample" to see an example conversion

Common Use Cases

  • Reading character-encoded data from log files or protocol traces that use decimal ASCII codes.
  • Translating decimal-encoded text from embedded systems or serial communications.
  • Learning ASCII encoding in computer science or programming courses.
  • Converting decimal codes from ASCII tables during manual encoding/decoding exercises.
  • Reversing decimal-encoded text in CTF (Capture the Flag) challenges or security exercises.
  • Debugging character encoding issues in data pipelines by verifying decimal-to-char mappings.

Example Input and Output

A sequence of decimal ASCII codes representing "WebTools" is converted to the readable text.

Decimal ASCII codes
87 101 98 84 111 111 108 115
ASCII characters
WebTools

Privacy

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

Extended ASCII (128–255)

Codes 128–255 are not part of the original 7-bit ASCII standard. They are interpreted as Latin-1 (ISO-8859-1) characters in most browsers. Results for these codes may look different on different platforms.

Frequently Asked Questions

What is the decimal code for common characters?

Space = 32, ! = 33, 0–9 = 48–57, A–Z = 65–90, a–z = 97–122, DEL = 127. The full ASCII table covers decimals 0–127 for standard characters.

How is this different from byte to ASCII?

They are essentially the same — a byte is an 8-bit value (0–255) and ASCII codes are decimal numbers. The terms are interchangeable for the 0–127 range. This tool focuses on the decimal notation used in ASCII tables, while byte-to-ASCII typically emphasises raw binary byte data.

Can I enter decimal codes without separators?

No. Because decimal codes vary from 1 to 3 digits (e.g. 65 for "A" or 127 for DEL), the tool needs spaces or commas to tell where one code ends and the next begins.

What are control characters in ASCII?

ASCII codes 0–31 and 127 are control characters — they do not produce printable glyphs. Examples: 0 = NUL (null), 9 = TAB, 10 = LF (newline), 13 = CR (carriage return), 27 = ESC, 127 = DEL. They are included in the output as invisible characters.

Is my data kept private?

Yes. All conversion runs in your browser — nothing is sent to a server.

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