Number base converter
Type a number in any box (binary, octal, decimal, hex, base 36 or a custom base) and all the others update instantly. Huge numbers stay exact.
- ๐ Runs on your device
- โค 0 bytes uploaded
- ๐ด Works offline
- โ Free, no sign-up, no watermark
How to use Number Base Converter
- Type a number in the box for its base.
- Read the other bases as you type.
- Turn on Group digits for readability.
- Copy the value you need.
Is it private?
Yes. Number Base Converter runs entirely in your web browser. What you type is never sent to Nolo or anyone else, and the page cannot send it anywhere: its security policy only allows it to talk to nolotools.com, which has no place to receive data. Nothing is stored either: close the page and it is gone. How Nolo works.
Questions and answers
Is there a size limit?
No practical limit. Numbers are stored as BigInt, so a 300-digit number converts exactly, unlike many converters that round after 16 digits.
Can I type 0x, 0b or 0o prefixes?
Yes. 0x in the hex box, 0b in binary and 0o in octal are accepted, as are spaces, underscores and commas between digits.
How are negative numbers shown?
With a minus sign in every base (-ff). Two's complement is not shown because it depends on a fixed bit width.
Does it convert fractions?
No, whole numbers only.
Is my data sent to a server?
No. Everything runs in your browser and your data never leaves your device. The page is not allowed to talk to any other site, so it is safe to use with real data and secrets.