How do I enter a negative number?

Type a minus sign followed by the decimal value in the decimal field. The converter will calculate the two's complement binary representation for the selected bit width (8, 16, 32, or 64 bits).

What is two's complement?

Two's complement is the standard way computers represent signed (negative and positive) integers in binary. To negate a number, flip all bits then add 1. For example, in 8-bit two's complement, -1 is represented as 11111111.

How do I enter a hexadecimal number?

Type hex digits (0-9 and A-F, case-insensitive) directly into the Hex field. You can optionally prefix with 0x, but it is not required. The other fields update immediately.

What does the bit width selector do?

The bit width (8, 16, 32, 64) controls how many bits are used for the binary display and two's complement wrapping. For example, the decimal value 255 fits in 8 bits, but -1 requires the full bit width to show 0xFFFFFFFF in 32-bit mode.

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Binary / Hex / Octal / Decimal Converter

Convert numbers between binary, hexadecimal, octal, and decimal bases instantly.

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このツールについて

The Binary / Hex / Octal / Decimal Converter lets you enter a number in any base and instantly see its representation in all four bases simultaneously. Type in the binary, hex, octal, or decimal field and the other three update in real time. Choose a bit width (8, 16, 32, or 64 bits) to see the two's complement representation for negative numbers. The tool also supports floating-point numbers in decimal input, showing the IEEE 754 binary representation. Each output field is selectable for easy copying. A bit-field visualization shows the individual bits of the 8/16/32-bit representation, color-coded by significance, making it ideal for embedded systems programmers and computer science students.

使い方

1 Select the bit width (8, 16, 32, or 64 bits) from the selector.
2 Type a number into any of the four input fields (Binary, Octal, Decimal, or Hex).
3 The other three fields update instantly with the converted values.
4 For negative numbers, type a minus sign before the decimal value.
5 Click any field to select all text for easy copying.
6 Toggle the bit visualizer to see individual bits highlighted by value.

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