Is the converter free?

Yes. The tool is completely free and runs in your browser with no account required.

Which number bases are supported?

The converter supports the four common bases: binary (2), octal (8), decimal (10), and hexadecimal (16).

Yes. Click the copy icon next to any result to copy it to your clipboard instantly.

Yes. Recent conversions are saved locally in your browser via localStorage and can be cleared anytime.

Yes. The tool is responsive and works on phones, tablets, and desktop browsers.

Convert numbers between binary, octal, decimal, and hexadecimal instantly. Free in your browser with copy buttons and conversion history.

Convert numbers between binary, octal, decimal, and hexadecimal.

Number

Tip: use valid digits for the selected base.

Base

No history yet.

Uses digits 0–9.

Uses digits 0 and 1.

Uses digits 0–7.

Uses digits 0–9 and A–F.

What does this number-base converter do?

It converts a value between decimal, binary, octal, and hexadecimal for study and programming. Results update from the value you type.

Type the number in the source base and read the equivalents. Use only symbols legal in that base (A–F in hex). For Base64 text use the encoder tool.

The converter targets common integer values in this UI; it is not a full scientific calculator.

When do you need base conversion?

A networking or architecture homework item.

Reading a HEX color as components.

Interpreting a mask or flag in a technical doc.