Number Base Converter

About Number Base Converter

A number base converter saves you from working it out by hand when a value turns up in the wrong base: a hex color or error code, a binary flag field, file permissions such as 755 in octal, or an ID written in base 36. Enter a number in the base you have and see it in binary, octal, decimal and hexadecimal at once, plus any base you choose from 2 to 36.

There's no size limit on whole numbers. They're handled as big integers, so a 32-digit hex hash or a long database ID converts exactly, where a spreadsheet would round it after 15 digits. Negative numbers can be shown in two's complement at 8, 16, 32 or 64 bits, the way a CPU stores them, so -1 at 8 bits is 11111111, or FF in hex. It all runs in your browser.

How to use Number Base Converter

1. 1
   Enter a number

   Type it in the base you have, such as hex FF or binary 1010.

2. 2
   Read every base

   Binary, octal, decimal and hexadecimal appear together.

3. 3
   Add a custom base

   Pick any base from 2 to 36 for an extra result.

4. 4
   Read negatives as two's complement

   A negative number is shown at every width it fits (8, 16, 32 or 64 bits).

Why use Cubfile for this

• All the common bases

  Binary, octal, decimal and hex at once, plus any base from 2 to 36.

• No size limit

  Big integers are converted exactly, with no rounding.

• Two's complement

  Negative numbers at 8, 16, 32 or 64 bits, as stored in memory.

• Works offline

  Runs in your browser and needs no connection once the page is open.