How do I convert a number between bases?

Select the input base (Decimal, Hex, Binary, or Octal) from the dropdown, enter your number, and all four representations appear instantly. Click 'Copy' next to any row to copy that value.

What number bases are supported?

The converter supports base 10 (Decimal), base 16 (Hexadecimal), base 2 (Binary), and base 8 (Octal) — the four most commonly used number systems in computing and programming.

Is the number base converter free?

Yes, completely free. The conversion runs entirely in your browser — no data is sent to any server, and no signup is required.

Number Base Converter

Convert numbers between decimal, hexadecimal, binary, and octal instantly online. Free number base converter tool. No signup required.

Decimal Input

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How to Use the Number Base Converter

Select the input base using the Dec / Hex / Bin / Oct toggle.
Enter your number in the input field.
All four representations appear instantly below.
Click Copy next to any row to copy that value.
Use Load Example to see a sample conversion (255 in decimal).

Common Number Systems

Decimal (Base 10) — everyday numbers using digits 0–9
Hexadecimal (Base 16) — uses 0–9 and A–F; common in color codes, memory addresses, and bytecode
Binary (Base 2) — uses 0 and 1; the native language of computers
Octal (Base 8) — uses 0–7; used in Unix file permissions