Number Base Converter
Convert numbers between decimal, hex, binary and octal, including very large values. Free and private: runs in your browser.
Paste numbers one per line. Prefixes like 0x, 0b and 0o are detected automatically.
Runs entirely in your browser. Nothing you paste is uploaded or stored.
Use cases
- Answer a quick question without leaving the browser.
- Debug web and API behaviour faster.
- Share a precise result with a teammate.
Frequently asked questions
How do I read hex quickly?
Each hex digit is four bits: F = 1111, so 0xFF = 1111 1111 = 255.
Is the Number Base Converter free?
Yes. It is free with no sign-up, and it runs entirely in your browser, so your input is never uploaded or stored.
Do I need an account?
No. The tool is free, needs no sign-up and runs in your browser.
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