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Number Base Converter

Convert a number between binary, octal, decimal and hexadecimal — see all four at once. Free and private, right in your browser.

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Decimal—
Binary—
Octal—
Hex—

How to use

  1. Type your number in the Value box.
  2. Choose which base it is written in — decimal, binary, octal or hexadecimal.
  3. Read it converted into all four bases at once. It updates as you type.

FAQ

Which bases does it support?

Binary (base 2, digits 0–1), octal (base 8, 0–7), decimal (base 10, 0–9) and hexadecimal (base 16, 0–9 and A–F). Pick the base your value is written in, and it shows the value in all four at once — handy for programming, colour codes and networking.

Can it handle very large numbers?

Yes. It uses big-integer maths, so even very long binary or hex values convert exactly without rounding. It works with whole, non-negative numbers; decimals and negatives are not supported.

Is anything I type sent anywhere?

No. The conversion is plain logic in your browser — nothing is uploaded or saved. It works offline and keeps your input private.