Number Base Converter
Instantly convert any number between Binary (base 2), Octal (base 8), Decimal (base 10), and Hexadecimal (base 16). Type your number, select the source base, and see all conversions update in real time.
Your files stay private
All processing happens directly in your browser using WebAssembly. Your files are never uploaded to any server and never leave your device.
Conversions
Binary (Base 2)
0B11111111Octal (Base 8)
0O377Decimal (Base 10)
255Hexadecimal (Base 16)
0XFFHow to Use Number Base Converter
- 1
Select the input base (Binary, Octal, Decimal, or Hex)
- 2
Type your number
- 3
See all other base conversions instantly
- 4
Copy any result with one click
Frequently Asked Questions
What is hexadecimal used for?
Hexadecimal (base 16) is widely used in programming for memory addresses, color codes (e.g., #FF5733), and binary data representation.
What numbers are valid in binary?
Binary only accepts 0 and 1. Any other digit will be rejected with an error message.
Features
- Binary, Octal, Decimal, Hex support
- Real-time conversion as you type
- Input validation per base
- Copy any format with one click
- Color-coded to highlight current base
Supported Formats
Input
Output
Binary / Hex / DecimalPrivacy First
All conversions happen in your browser. Nothing is uploaded to our servers. Your files remain completely private.