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Number Base Converter
One number per line — decimal, or prefixed 0x (hex), 0b (binary), 0o (octal) — converted to all four bases exactly, any size (big integers included). Negative numbers keep their sign; anything else is reported on its line.
A little guidance. A better result.
How to use Number Base Converter
Decimal, hex, binary, octal — every number converted to all four bases exactly, big integers included.
Prepare your input
Enter numbers using the supported base notation.
Use the workspace
Review decimal, hexadecimal, binary and octal results.
Check your result
Check prefixes and signs before using the converted values.
Know the limits
This converts integers, including large integers; it is not a fractional-number calculator.
Where does my input go?
This browser tool processes your input on your device. Optional analytics is a separate choice; it is not needed to use the tool. Keep your original until you have checked the result.
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