Number Base Converter
Convert a number between binary, octal, decimal and hexadecimal.
Runs entirely in your browser. Handles arbitrarily large integers exactly.
How it works
- 1Type a number and choose which base it's currently in.
- 2See it converted to binary, octal, decimal and hex at once.
About this tool
Type a number and choose which base it’s currently in — binary, octal, decimal or hexadecimal — and see it converted into all four at once. Arbitrarily large integers are handled exactly, with no precision loss.
Does it handle really large numbers correctly?
Yes — conversion uses arbitrary-precision integer math internally, so it stays exact even far beyond what a normal 64-bit number could represent without rounding.
Can I convert negative numbers?
Yes, start the number with a minus sign.
Is my data sent anywhere?
No, everything happens entirely in your browser.