decoder.tools

Octal & Decimal to ASCII Decoder

Convert decimal or octal character codes into text. 72 101 108 108 111 becomes Hello.

Data, Radix & StringFree
INPUT
OUTPUT

The result appears here as you type.

Decoding runs in your browser. What you paste is not sent to a server.

A decimal or octal to ASCII converter reads each number as a character code and outputs the matching character. In decimal, 65 is A. In octal, 101 is A.

Example

Input
72 101 108 108 111
Output
Hello

The same word in octal, with Base: Octal selected: 110 145 154 154 157.

Character codes in decimal and octal

Every character has a number. ASCII covers 0 to 127 and Unicode extends the same numbering to over a million code points. Decimal is how most people write those numbers, and it's what you get from JavaScript's charCodeAt, Python's ord() and Excel's CODE().

Octal (base 8) is older but still around. You will see it in C and shell escape sequences such as \101 for A, in od output, in Unix file permissions and in some CTF puzzles. Values above 255 work as Unicode code points, so 8364 in decimal (or 20254 in octal) is €.

The numbers can be separated by spaces, commas, new lines or any other non-digit character.

Useful ranges

DecimalOctalCharacters
3240space
48–5760–710–9
65–90101–132A–Z
97–122141–172a–z
1012line feed

How to use the converter

  1. Choose Decimal or Octal in the Base menu.
  2. Paste the numbers, separated by spaces, commas or new lines.
  3. Read the text. An error means a value isn't valid in the chosen base, for example an 8 or 9 in octal.

Convert character codes in code

Python
print("".join(chr(int(n)) for n in "72 101 108 108 111".split()))     # Hello
print("".join(chr(int(n, 8)) for n in "110 145 154 154 157".split()))  # Hello
JavaScript
console.log(String.fromCodePoint(72, 101, 108, 108, 111)); // Hello

At a glance

Bases supportedDecimal (10) and octal (8)
Range0 to 1,114,111 (all Unicode code points)
SeparatorsAny non-digit character
For hex codesUse the Hex to text converter

Frequently asked questions

What is the ASCII code for A?

65 in decimal, 101 in octal, 41 in hex and 01000001 in binary. Lowercase a is 97 in decimal.

How can I tell decimal from octal?

Octal never contains the digits 8 or 9. Text in octal also tends to have three-digit values from 101 upward, since A is 101 and a is 141. If you see an 8 or 9, it's decimal.

Can it decode emoji?

Yes, if you give it the full code point. 128640 in decimal is 🚀. Splitting an emoji into UTF-8 bytes (240 159 154 128) won't work here, because each number is read as a separate code point.

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