Hexadecimal (base 16) uses digits 0–9 and letters A–F to represent values 0–15 per digit. It's used in programming for compact binary representation — one hex digit represents 4 binary bits.

Binary (base 2) uses only 0 and 1. It's the fundamental number system of digital computers. Every number, character, and piece of data in a computer is ultimately stored as binary.

What is octal used for?

Octal (base 8) is used in Unix/Linux file permissions (chmod values like 755 or 644) and in some older computer systems. Each octal digit represents 3 binary bits.

Why is hex useful for colours?

CSS hex colour codes (#FF5500) use hexadecimal because each colour channel (R, G, B) can be represented as exactly 2 hex digits (00–FF), mapping to 0–255 in decimal — the 8-bit range of each colour channel.

Base 36 uses digits 0–9 and letters A–Z. It's used for URL shorteners and compact ID generation because it maximises the information density of alphanumeric strings.

Converters

Free

Number Base Converter

Convert numbers between Binary (base 2), Octal (base 8), Decimal (base 10), and Hexadecimal (base 16).

Input Number

From Base

What is Number Base Converter?

The Number Base Converter converts numbers between different numeral systems — binary (base 2), octal (base 8), decimal (base 10), hexadecimal (base 16), and any custom base from 2 to 36. Enter a value in any base and instantly see its equivalent in all other bases.

Numeral system conversion is fundamental in computer science, digital electronics, and low-level programming. Hexadecimal is used in memory addresses, colour codes, and debugging; binary is the foundation of digital computing; octal appears in Unix file permissions.

Why Use Number Base Converter?

Programmers, computer science students, and electronics engineers routinely need to convert between number bases. Rather than performing manual positional arithmetic (which is slow and error-prone), this tool provides instant accurate conversions across all common number bases.

Key Features of Number Base Converter

✓Converts between binary, octal, decimal, and hexadecimal
✓Supports custom base conversion (base 2–36)
✓Shows all bases simultaneously for comparison
✓Handles large numbers accurately
✓Explains the conversion steps

How to Use Number Base Converter

1
Enter your number
Type the number you want to convert in the input field.
2
Select the input base
Choose the base of your input number (binary, decimal, hex, etc.).
3
See all conversions
View the equivalent value in binary, octal, decimal, and hexadecimal instantly.
4
Copy any value
Click 'Copy' next to any converted value to copy it to your clipboard.
5
Use in your work
Use the converted values in your programming, debugging, or calculations.