Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal. Supports large numbers with BigInt.
What are Number Base Systems?
A number base (or radix) defines how many unique digits are used to represent numbers. Decimal (base 10) uses digits 0-9 and is the everyday system. Binary (base 2) uses 0 and 1 and is the native language of computers. Octal (base 8) uses 0-7 and appears in Unix file permissions. Hexadecimal (base 16) uses 0-9 and A-F, providing a compact way to represent binary data โ one hex digit maps to exactly 4 binary bits.
How to Convert Between Number Bases
Select the input base (binary, octal, decimal, or hexadecimal) from the dropdown menu.
Enter your number. The tool instantly shows the equivalent value in all four base systems simultaneously.
Copy any converted value with one click. Large numbers are supported through JavaScript BigInt.