Number Base Converter
This free number base converter tool takes a value in binary, octal, decimal or hex and instantly shows it in all four bases at once. Type a number, pick its base, and copy any result — everything runs on your device, with no uploads.
11111111377255ffHow to use Number Base Converter
- 1 Type or paste your number into the Value box.
- 2 Choose the base of what you entered — Binary, Octal, Decimal or Hex — from the Input base menu.
- 3 Read the converted results, shown at the same time in binary, octal, decimal and hexadecimal.
- 4 Click the copy button next to any result to grab it — nothing ever leaves your browser.
Frequently asked questions
Is my input sent anywhere?
No. The conversion is pure JavaScript that runs locally in your browser, so the numbers you enter never leave your device.
Which bases can I convert between?
You can enter a value in binary (base 2), octal (base 8), decimal (base 10) or hexadecimal (base 16), and every conversion is shown for all four bases at once.
Why does it say my number is invalid?
It means the value contains characters that do not belong to the base you selected — for example letters other than A–F in hex, or digits above 1 in binary. Fix the value or switch the input base to match.
Does the converter work offline?
Yes. PDFPowerHub is a PWA, so once the page has loaded it keeps converting even with no internet connection.