Number Base Converter
Convert between binary, octal, decimal and hex live.
01Number Base Converter
All processing happens locallyWhat this tool does
Number Base Converter is a live multi-base number converter, the calculation runs entirely in your browser and nothing is uploaded.
Different bases appear everywhere in development: colours are hex, permission bits are binary, memory addresses are read in hex. A reliable converter saves mental arithmetic.
How to use it
- Paste or type your content into the input field at the top, or press the sample button to load demo data.
- Adjust the options below the input, such as output format, separators, letter case or precision.
- Press the main button to run the conversion. Results appear instantly in the output panel without a page reload.
- When the result looks right, use the copy button in the corner, or download it as a local file.
Tips and notes
Clean up stray spaces and line breaks before pasting for more accurate results.
FAQ
Stay within about 15 significant decimal digits; beyond that floating point precision is lost, so split very large integers.
Negatives keep a minus sign rather than two's complement, which matches mathematical conversion.
Yes, tick the option to output with a 0x prefix so it can be pasted straight into code.
Yes. The tool is completely free with no usage limits, and you never need an account or a sign-in.
No. All processing runs locally in your browser, so the input never reaches a server and is never logged or stored.
Yes. The layout is mobile-first, so inputs and buttons stay comfortable on phones and tablets in both orientations.
Yes. A copy button in the output panel puts the result on your clipboard, and you can also download it as a text file.