Number Base Converter
Convert between binary, octal, decimal, hexadecimal and any base from 2 to 36.
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How to use
- Type a number and choose the base it is written in.
- See it in binary, octal, decimal and hexadecimal instantly.
- Pick any other base from 2 to 36 for an extra result.
How it works
Conversion uses arbitrary-precision integers, so very large numbers convert exactly. For negative numbers the two’s-complement bit patterns used by computers are shown for 8, 16, 32 and 64 bits.
Limitations
- Whole numbers only — fractional parts are not converted.
Privacy
Your text is processed entirely in this browser tab. Nothing is uploaded, logged or saved by this tool.
Local processing protects your data from being uploaded, but it cannot protect against a compromised device or malicious browser extensions.