Binary Octal Decimal Converter
Convert between binary, octal, decimal, and hexadecimal number systems instantly.
About Binary Octal Decimal Converter
Our free online Binary Octal Decimal Converter is a powerful tool that converts between binary, octal, decimal, and hexadecimal number systems. It also supports converting text strings to their binary representation and back.
Different number bases are used in various computing contexts. Binary (base-2) is the fundamental language of computers. Octal (base-8) and hexadecimal (base-16) provide compact representations of binary data. Decimal (base-10) is the number system we use in everyday life.
This tool processes your input entirely in the browser using JavaScript, ensuring your data never leaves your device. Convert between number bases instantly for programming, education, or data analysis tasks.
The auto-convert feature updates the output in real-time as you type, making it convenient for quick conversions. You can convert between any combination of text, binary, octal, decimal, and hexadecimal formats.
Features
Fast Conversion
Convert between number bases instantly with no registration or limits. Completely free to use.
Auto-Convert
Automatically update the output as you type for real-time number base conversion.
Text Support
Convert text strings to binary representation and decode binary back to readable text.
Multi-Base Support
Convert between binary, octal, decimal, and hexadecimal in any combination.
One-Click Copy
Copy the converted result to clipboard with a single click.
Privacy First
All processing happens in your browser. Your data never leaves your device.
How to Use
Select Input Type
Choose the type of your input data: Text, Binary, Octal, Decimal, or Hexadecimal.
Select Output Type
Choose the desired output format: Binary, Octal, Decimal, or Hexadecimal.
Enter Your Input
Type or paste the number or text you want to convert into the input editor on the left.
Convert and Copy
Click Convert or enable auto-convert for real-time conversion, then copy the result.
Frequently Asked Questions
What is binary?
Binary is a base-2 number system that uses only two digits: 0 and 1. It is the fundamental language of computers, as electronic circuits operate in two states (on/off). Each digit in a binary number is called a bit, and 8 bits make one byte.
How do I convert decimal to binary?
To convert decimal to binary, repeatedly divide the number by 2 and record the remainder. The binary representation is the sequence of remainders read from bottom to top. For example, 42 in decimal equals 101010 in binary.
What is the difference between octal and hexadecimal?
Octal is a base-8 system using digits 0-7, while hexadecimal is a base-16 system using digits 0-9 and letters A-F. Hexadecimal is more commonly used in computing because it maps neatly to bytes (2 hex digits = 1 byte), while octal maps less conveniently (3 bits per digit).
Can this converter handle negative numbers?
This tool supports positive numbers in all base conversions. For negative numbers in binary, you would typically use two's complement representation, which requires knowing the bit width (e.g., 8-bit, 16-bit, 32-bit). This converter focuses on standard positive number conversions.
How does text-to-binary conversion work?
Each character in the text is converted to its ASCII decimal code, then to its 8-bit binary representation. For example, "A" becomes ASCII 65, which is 01000001 in binary. Spaces between 8-bit groups represent separate characters.
Does it work offline?
Yes, once the page is loaded, all conversion happens entirely in your browser using JavaScript. No server communication is needed, so you can use it even without an internet connection after the initial page load.