Zase
Add to Chrome

Number Base Converter

Convert integers between binary, octal, decimal, hex and more.

Get it in Chrome

Also available in the Chrome extension Every Zase tool also lives in the free Developer Toolkit by Zase extension: fully offline, in a window or the side panel, one keyboard shortcut away.

Add to Chrome

About this Number Base Converter

The Number Base Converter converts integers between binary, octal, decimal, hexadecimal and other bases, with BigInt support for values too large for normal number types. It is the quick check for permission bits, color channels, memory addresses and bitwise homework.

How to use the Number Base Converter

  1. Type a value and set the base it is written in.
  2. Read the converted value in every common base at once.
  3. Copy the base you need for your code or notes.

Good to know

  • Hex and binary views side by side make bitmask and flag work much easier to follow.
  • Values beyond the safe integer range stay exact, because the maths uses BigInt.
  • A file permission like 755 is octal; this tool and the chmod Calculator cover the same ground from two sides.

Related tools

JSON Formatter Format, validate, minify, sort, tree view and convert JSON. SQL Formatter Format SQL with clause breaks and keyword casing. JSON to Types Turn a JSON sample into TypeScript, Go or Python types. CSS Formatter & Minifier Format CSS with clean indentation, or minify it for production.