Number Base Converter

Convert between binary, octal, decimal, hex

Input Number

From Base

Binary (2)

Octal (8)

Decimal (10)

Hexadecimal (16)

About Number Base Converter

Number base conversion is fundamental in computer science. Binary (base-2), octal (base-8), decimal (base-10), and hexadecimal (base-16) are commonly used in programming and digital systems.

How to Use This Tool

Enter a Number

Type the number you want to convert. Make sure it is valid for the selected input base.

Select the Input Base

Choose which number system your input is in: Binary (base 2), Octal (base 8), Decimal (base 10), or Hexadecimal (base 16).

View All Conversions

The number is instantly converted to all four bases. The source base card is highlighted for easy reference.

Example

Input

255 (Decimal)

Output

Binary: 11111111 | Octal: 377 | Hex: FF

Pro Tips

Binary uses only 0 and 1, Octal uses 0-7, Decimal uses 0-9, Hex uses 0-9 and A-F.
Hexadecimal is widely used in web colors (e.g., #FF5733) and memory addresses.
Conversions happen in real-time as you type — no need to click a button.