In-browser tool
Number Base Converter
Convert between binary, octal, decimal and hexadecimal — enter a value like 0xff, 0b1010 or 255 and see every base at once.
How it works
01
Type or paste your input
02
Get the result instantly
03
Copy the result
Frequently asked questions
How do I convert hex to decimal?
Type the value with a 0x prefix (e.g. 0xff) and the decimal, octal and binary equivalents appear instantly. It handles very large numbers via BigInt, all in your browser.
Is my file uploaded to a server?
No. This tool runs entirely in your browser. You can open your browser's network tab and verify no request carries your file.