Number Base Converter

Hexadecimal needs sixteen distinct symbols to represent its digits, so it borrows 0 through 9 for the first ten values and then uses the letters A through F for ten through fifteen. A memory address or an error code showing up as something like 0x4F2A isn't arbitrary, it's a compact, direct representation of the underlying binary value, just far shorter and easier to type or read than the binary equivalent would be.

Web colors are the other place this comes up constantly outside of low-level debugging. A hex color code like #FF5733 is really three separate hexadecimal pairs, one each for red, green, and blue, each pair representing a decimal value from 0 to 255. Converting a pair back to decimal is exactly what you need when you're manipulating a color's RGB values directly in code rather than through a color picker.

Select your input's base and paste the value in, and the tool calculates the equivalent across binary, octal, and decimal simultaneously, ready to copy straight into whatever you're working on.

The tool comfortably handles standard large integers within normal browser memory limits. Numbers that exceed a standard 64-bit integer range are rare in everyday use but can require specialized tools to avoid rounding errors if you run into them. Conversion happens entirely locally, so a memory address or color value tied to proprietary code never gets sent anywhere.