Number Base Converter

Convert numbers between binary, octal, decimal and hexadecimal, with big integers and any base from 2 to 36

Runs locally in your browser. Nothing is uploaded.

Input

Input base

Integer

A minus sign and the 0x, 0b or 0o prefixes are allowed; spaces and underscores are ignored. Integers only, no decimals

Type an integer such as 255 to see it in binary, octal, decimal and hexadecimal

Group binary digits in foursDisplay only; copied values have no spaces

Letter case

For hexadecimal and other bases above 10

Custom target base

1
Choose the input base
Select 2, 8, 10 or 16, or choose Other to pick another base from the list
2
Enter an integer
Paste or type the number. A minus sign, a prefix such as 0x, and spaces or underscores as separators are all fine; results update as you type
3
Copy a result
Binary, octal, decimal, hexadecimal and your custom base are listed together. Select Copy next to the one you need

Integers of any length
Values are computed exactly with BigInt, so numbers beyond 2^64 keep every digit. Handy for hashes and long IDs
Integers only
A decimal point is reported with its position, and scientific notation such as 1e10 isn't supported. Negative numbers convert as a minus sign plus the magnitude, not two's complement
Prefixes and letters
0x, 0b and 0o mark hexadecimal, binary and octal, and are removed when they match the input base. Bases above 10 use a–z for 10–35, in either case