Browser-onlyLiveDeveloper Tools
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal.
Privacy note. Runs in your browser. Numbers you enter are only used to compute the conversions shown on this page.
Decimal
255Hexadecimal
FFOctal
377Binary
11111111Recommended next steps
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Frequently asked questions
Binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). Pick the base of your input; the other three are computed instantly.
Yes. Conversion uses arbitrary-precision integers (BigInt), so values far beyond the usual 64-bit range stay exact with no rounding.
Yes. A leading 0x (hex), 0o (octal) or 0b (binary) prefix that matches the selected input base is accepted and ignored.
Last updated 2026-06-20.