Is Number Base Converter free to use?

Yes, this tool is completely free with no limitations. No registration or payment required.

Absolutely. All processing happens in your browser. Your data never leaves your device and is not uploaded to any server.

Number Base Converter

Convert between decimal, binary, octal, and hexadecimal number systems.

Decimal (Base 10) 0-9

Binary (Base 2) 0b

Octal (Base 8) 0o

Hexadecimal (Base 16) 0x

Custom Base Conversion

From Base

Input Value

To Base

Frequently Asked Questions

A number base (or radix) determines how many unique digits are used to represent numbers. Decimal uses 10 digits (0-9), binary uses 2 (0,1), octal uses 8 (0-7), and hexadecimal uses 16 (0-9, A-F).

Computers use binary because digital circuits have two states: on (1) and off (0). All data in computers, including numbers, text, and images, is ultimately stored and processed in binary.

Hexadecimal is commonly used in programming for memory addresses, color codes (#FF0000), MAC addresses, and anywhere binary data needs to be displayed compactly. Each hex digit represents exactly 4 binary digits.