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🔢 Free Developer Converter

Number Base Converter Online Free

Convert numbers between binary, decimal, hexadecimal, octal and custom bases. Supports bases from 2 to 36 and runs fully in your browser.

✅ Free to use⚡ Instant conversion🔢 Base 2 to 36📱 Mobile friendly

Convert Number Base

Use digits 0-9 and letters A-Z for bases above 10.
Original number base.
Target number base.
Common Bases Binary = Base 2 uses 0 and 1
Octal = Base 8 uses 0 to 7
Decimal = Base 10 uses 0 to 9
Hexadecimal = Base 16 uses 0 to 9 and A to F

Result

FF 255 in base 10 equals FF in base 16
Binary11111111
Octal377
Decimal255
HexadecimalFF

Popular Conversions

How to Use the Number Base Converter

Convert number systems in three simple steps.

1. Enter number

Paste or type the number you want to convert.

2. Choose bases

Select the source base and the target base from 2 to 36.

3. View result

See the converted result plus binary, octal, decimal and hexadecimal equivalents.

Fast base conversion for developers and students.

This Number Base Converter helps programmers, students, engineers and digital logic learners convert between binary, decimal, hexadecimal, octal and custom bases without installing software.

You can convert base 2 to base 36 values, check common binary, octal, decimal and hex equivalents, and use the tool for programming, computer science, networking and digital electronics.

✅ Convert binary, decimal, hex and octal
✅ Supports custom bases from 2 to 36
✅ Instant browser-based conversion
✅ Great for programming and computer science

What is a number base converter?

A number base converter changes a number from one numeral system to another, such as binary to decimal, decimal to hexadecimal or octal to binary.

It is useful for programming, debugging, digital logic, computer science classes, networking, data representation and learning how number systems work.

When should you use it?

  • Converting binary to decimal
  • Changing decimal to hexadecimal
  • Checking octal, binary and hex values
  • Working with bases from 2 to 36
  • Studying programming and computer science

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Number Base Converter FAQ

Common questions about number base conversion.

What is binary?

Binary is base 2. It uses only two digits: 0 and 1.

What is hexadecimal?

Hexadecimal is base 16. It uses digits 0 to 9 and letters A to F.

Can I convert custom bases?

Yes. This converter supports any base from 2 to 36.

Does this converter use a backend?

No. All number base conversions run directly in your browser with HTML, CSS and JavaScript.

Can I convert binary to decimal?

Yes. Enter a binary number, select base 2 as the source and base 10 as the target.

Can I convert decimal to hexadecimal?

Yes. Enter a decimal number, select base 10 as the source and base 16 as the target.

Which bases are supported?

This tool supports bases from 2 to 36, including binary, octal, decimal and hexadecimal.

Does it work on mobile?

Yes. This number base converter works on desktop, tablet and mobile browsers.