Number Base Converter
Convert numbers between binary, octal, decimal and hexadecimal (or any base 2–36).
Runs in your browser — files never leave your device
Binary (base 2)
11111111
Octal (base 8)
377
Decimal (base 10)
255
Hex (base 16)
ff
How it works
Enter a value and its base; the binary, octal, decimal and hex equivalents update live.
Negative numbers are supported.
Frequently asked questions
- Which bases are supported?
- Binary, octal, decimal and hexadecimal, shown side by side.
- Is my input uploaded?
- No — conversion happens in your browser.
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