Your Number Base Converter
Convert numbers between binary, octal, decimal, hexadecimal and any base from 2 to 36. Handles very large numbers exactly.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
255 (decimal) = 11111111 (binary) = 377 (octal) = FF (hex) FF (hex) = 255 (decimal) 1010 (binary) = 10 (decimal)Open the Number Base Converter
Illustration. Open the tool for the real thing.
See it in action
Sample input: Number = 255; Custom target base (2–36) = 32
What is the Number Base Converter?
Computers work in binary (base 2), programmers read memory in hexadecimal (base 16), Unix permissions use octal (base 8) and people count in decimal (base 10). A number base converter translates a value between these systems — and any other base from 2 up to 36.
Enter a number, choose the base it is written in, and see it in binary, octal, decimal, hexadecimal and base 36 at once, plus a custom base of your choice. It uses exact big-integer arithmetic, so even very long numbers convert without rounding errors, and it also shows the bit length.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Binary, octal, decimal, hex and base 36 side by side.
Pick a custom target base.
Exact arithmetic for very long values.
See how many bits the number needs.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
How it compares
A plain look at this tool next to the usual alternative.
| This utility | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
How do I convert binary to decimal?
Multiply each digit by its power of two and add the results.
What is hexadecimal used for?
A compact way to write binary — each hex digit equals four bits.
What bases are supported?
Every base from 2 to 36.
Does it support negative numbers?
Yes, a leading minus sign is kept.
How big can the number be?
Very large; exact arithmetic is used.
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Try the Number Base Converter now
Binary, octal, decimal, hex & any base 2–36. Free to use.
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