Last Updated: April 13, 2026
Number Base Converter
Free number base converter. Convert between binary, decimal, octal, and hexadecimal instantly.
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Frequently Asked Questions
Why is binary important?
Computers operate in binary (0s and 1s). Every instruction, number, and character is ultimately stored in binary.
What is hexadecimal used for?
Hex is a compact way to represent binary. 1 hex digit = 4 binary digits. Used in colors (#FF0000), memory addresses, and programming.
How to convert decimal to binary?
Divide by 2 repeatedly, read remainders bottom to top. 13 β 1101.