Number Base Converter
Convert numbers between binary, octal, decimal and hexadecimal. Big-number safe, with one-click copy.
- Runs in your browser
- No upload on server
- Free, forever
- Enter value
- Pick units
- Copy result
Negative numbers are supported. Big numbers use arbitrary precision — no overflow.
All bases
- Binary (base 2)—
- Octal (base 8)—
- Decimal (base 10)—
- Hex (base 16)—
How this works — and why it's private
- Pick which base you're starting from.
- Type a number — every other base updates instantly.
- Tap Copy next to the format you need.
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No account, no email, no tracking — just a 1–5 number.
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