Number Base Converter

Convert Numbers between Number Bases

The Number Base Converter changes numbers between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). Enter a number and its input base, and you instantly get all four representations. Such conversions are common in computer science, for example with color values, network masks, permissions, or when debugging in the binary range.

How it works

Each number system is based on a specific radix and uses a defined set of digits. Binary uses only digits 0 and 1, octal uses digits 0 through 7, decimal uses digits 0 through 9, and hexadecimal uses digits 0 through 9 plus letters A through F. A concrete example: the decimal number 255 is represented as 11111111 in binary, as 377 in octal, and as FF in hexadecimal. The converter calculates all representations from the input and displays them simultaneously.

What the tool can and cannot do

The converter correctly handles integer values and displays all four number systems. It is well suited for learning and everyday computer science tasks. However, it does not handle decimal fractions, negative values, or fractions. Very large numbers may cause display issues. Hexadecimal values are shown in uppercase letters.

Why local processing in the browser

The conversion runs entirely on your device. Your input never leaves the computer; there is no server receiving or storing data. Once the page is loaded, the converter works offline too. You can convert as often as you like and try different values without anything being logged or transmitted.

Frequently asked questions