Number Base Converter

How to use this number base converter

  1. Type a number into any of the four fields.
  2. The other three bases update automatically as you type.
  3. Copy the result you need — useful for programming, color codes, or networking.

Why do computers use hexadecimal and binary?

Binary (base 2) directly reflects how computers store data as on/off bits. Hexadecimal (base 16) is a compact, human-friendly way to represent binary data, since each hex digit maps exactly to 4 bits — that's why you see it in color codes, memory addresses, and MAC addresses.

What is octal used for today?

Octal is less common now, but still appears in Unix/Linux file permission codes (like chmod 755) and some older programming contexts.

Is there a limit to how large a number I can convert?

This tool uses standard JavaScript number precision, which is reliable up to about 9 quadrillion (2^53). Beyond that, results may lose precision.