Number base converter

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.
Tip: use valid digits for the selected base.
Quick examples
History

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About bases
Decimal

Uses digits 0–9.

Binary

Uses digits 0 and 1.

Octal

Uses digits 0–7.

Hexadecimal

Uses digits 0–9 and A–F.

How to use the number base converter

  1. Enter the number and select its current base (binary, octal, decimal, or hexadecimal).
  2. Click Convert to see the result in all four bases at once.
  3. Copy any result with one click or review your previous conversions in the history.

Number base converter — frequently asked questions

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

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.