Number Base Converter — Binary, Hex, Octal Online

What is Number Base Converter?

At the lowest level, every piece of data in a computer is stored as binary (base 2). For humans, however, binary strings are hard to read, which is why we use other systems like Hexadecimal (base 16) and Octal (base 8) to represent data more compactly. Our number base converter online tool allows you to instantly switch between these four primary systems: Binary, Octal, Decimal, and Hex. Hexadecimal is particularly valuable in computing because one hex digit (0-F) maps exactly to 4 binary bits (a nibble), making it easy to represent byte-level data like memory addresses or color codes. Octal, while less common today, is still the standard for representing Unix file permissions (like 755 or 644). Standard Decimal (base 10) is what we use in our daily lives, and this tool bridges the gap between human-readable numbers and machine-readable data. As you type into any field, the other three representations update instantly. This is an essential utility for CS students learning about number systems, firmware developers working with bitmasks, and web developers debugging CSS hex colors or environment configurations.

How to Use Number Base Converter

1. Enter a number in any base field.
2. All equivalent representations update instantly.

Developer Tips

In JavaScript, you can convert numbers between bases easily using the `toString(base)` and `parseInt(string, base)` methods. For example, `(255).toString(16)` results in "ff", while `parseInt("ff", 16)` returns 255.

Frequently Asked Questions