Converters
Binary, Hex & Decimal Converter
Convert numbers between binary, octal, decimal and hexadecimal instantly, including very large numbers.
Binary (2)
11111111
Octal (8)
377
Decimal (10)
255
Hexadecimal (16)
FF
Binary, Hex & Decimal Converter
Convert numbers between binary, octal, decimal and hexadecimal instantly, including very large numbers.
The Number Base Converter allows you to convert numbers seamlessly between common numerical systems: Binary (Base 2), Octal (Base 8), Decimal (Base 10), and Hexadecimal (Base 16). This tool is essential for students, programmers, and anyone working with computer systems or digital logic.
To use the converter, enter your number and select its original base (e.g., choose 'Decimal' for a standard number). The tool will automatically calculate and display the equivalent values in the other supported bases simultaneously.
For example, entering '255' in base 10 will show '11111111' in binary, '377' in octal, and 'FF' in hexadecimal. This immediate feedback makes it easy to switch between formats without needing manual calculations.
A common mistake is using invalid digits for a selected base (e.g., trying to use '2' in a binary system). The tool will notify you if your input is invalid for the chosen base. It runs entirely in your browser to provide instant results without any server requests.
Key Features
- Binary, Hex & Decimal Converter: 100% free, no sign-up
- Instant results as you type
- Private: runs in your browser
- Works on phone, tablet and desktop
- Available in English, Spanish, French and Arabic
How it works
The tool converts between bases by treating the input as a number in the source base, converting it into a universal decimal representation, and then formatting that decimal value into the target base's character set.
Worked example
Frequently asked questions
Does it support negative numbers?
This version is optimized for positive integers and computer-standard unsigned representations.
What if the input contains letters?
Letters are only valid for bases like hexadecimal (e.g., A-F). They are ignored or cause an error in lower bases.
Is there a limit to the number size?
The tool uses modern browser math capabilities, supporting very large numbers typical in programming.
Can I copy the results?
Yes, use the copy buttons next to each converted value to quickly grab the result.
Where is the data processed?
Everything happens in your local browser. No data is shared or stored.