Number Base Converter
Convert numbers between binary, octal, decimal and hexadecimal.
Convert a value from one number base to another — binary, octal, decimal or hexadecimal. Enter a number, choose the base it is in and the base you want, and the answer appears instantly.
Frequently asked questions
Can it convert hexadecimal to binary?
Yes — pick Hexadecimal as "From" and Binary as "To". Any pair of the four bases works.
What if I type an invalid number?
If the value is not valid for the chosen base (for example 2 in binary), the tool tells you instead of showing a wrong answer.