Number Base Converter
Convert integers between binary, octal, decimal, hex and any base — live, with big-number support.
Free online number base converter
The Ajenza Number Base Converter turns an integer from one numeral system into all the others at once — binary (base 2), octal (base 8), decimal (base 10) and hexadecimal (base 16), plus any custom base from 2 to 36. Type in any box and the rest update instantly. It uses arbitrary-precision integers, so even numbers well beyond 64 bits convert exactly, and it shows the bit length. Everything runs in your browser — nothing is uploaded.
Is it free?
Yes — completely free, with no sign-up, download or watermark.
Does it support negative or fractional numbers?
It converts non-negative integers. Fractions and signs aren't supported.
Is anything uploaded?
No — everything runs in your browser.
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