Number Base Converter
Free number base converter (binary, octal, decimal, hex and more).
100% runs in your browser — no upload, no trackingHow to use
Enter a number, choose the source and target base, then click Convert.
Example
255 (base 10) → ff (base 16)
FAQ
Is my data uploaded to a server?
No. Every tool runs entirely in your browser. Your input never leaves your device.
Is this tool free?
Yes, all DevToolbox tools are free to use with no account required.
Does it work on mobile?
Yes, the interface is mobile-friendly and responsive.
How accurate is the conversion?
We use standard, well-tested algorithms (Web Crypto, Intl, DOMParser). Results match common reference tools.