The best free number base converter changes a value between binary, octal, decimal and hexadecimal instantly in the browser. It is free with no account, does the math locally, and updates the result as you type.
Programmers and students regularly move numbers between binary, octal, decimal and hexadecimal, and doing it by hand is error prone. The best converter takes a value in any of these bases and shows the equivalent in the others at once, which saves you the manual arithmetic and the mistakes that come with it.
Because the conversion runs in your browser the result appears as you type, with no submit button and no server round trip. There is no account, no cost, and the page keeps working offline once it has loaded. That makes it a reliable helper for coursework, low level debugging, or reading a hex value from a config or an error message.
It converts between binary, octal, decimal and hexadecimal.
The math runs in your browser, so it works instantly and offline once loaded.
Yes. There is no account or cost.