Number Base Converter
Convert integers between bases 2–36 (binary, octal, decimal, hex, custom).
How to Use
- Type a number into any row.
- All rows update live.
- Use custom base for bases up to 36.
Show Work
Notes
About the Number Base Converter
The Number Base Converter is a simple, free helper for everyday maths and number work that runs entirely on your own device. Convert integers between bases 2–36 (binary, octal, decimal, hex, custom).
How it works
Type a value, then pick what you want to change it into. The answer appears straight away. It all happens on your own device, so it is fast and nothing you type is sent away. Just check that you picked the right “from” and “to” so you get the answer you wanted.
Want the deeper story? The Knowledge Base explains the ideas behind the tools in more detail.
Frequently Asked Questions
Negatives?
Leading `-` is preserved across bases.
Bases higher than 10?
Use 0-9 then A-Z (case-insensitive).
How do I use the Number Base Converter?
Just type or paste your value. The answer shows up right away — there is no button to press. Change anything and it updates by itself.
Does it cost anything or need an account?
No. The tool is completely free, there is no account to create, and it keeps working offline after the page first loads.
Is anything I type uploaded?
No. The tool works entirely on your device, so the values you enter never leave your browser.
Common Use Cases
Programming
Decode hex/binary literals.
Study
Learn positional systems.
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