Number Base Converter
Convert numbers between Binary, Octal, Decimal, and Hexadecimal instantly.
100% Client-Side • Privacy ProtectedFeatures
- Convert between Binary (base 2), Octal (base 8), Decimal (base 10), and Hexadecimal (base 16)
- Real-time conversion — type in any field and see all other bases update instantly
- BigInt support for arbitrarily large numbers
- Optional step-by-step conversion explanation
- Input validation with clear error messages
- One-click copy for any result
How to Use the Number Base Converter
- 1Type a number in any of the four input fields (Binary, Octal, Decimal, or Hex)
- 2The other three fields will update automatically with the converted values
- 3Click the copy button next to any result to copy it to your clipboard
- 4Toggle "Show Conversion Steps" to see how the conversion is performed
Frequently Asked Questions
How large of a number can I convert?
This tool uses JavaScript BigInt, so there is no practical limit on number size. You can convert numbers with hundreds or thousands of digits.
Does it support negative numbers?
Yes, you can enter negative decimal numbers (e.g., -42). The tool will show the negative representation in all bases.
What characters are valid for each base?
Binary: 0-1. Octal: 0-7. Decimal: 0-9 (and optional leading minus). Hexadecimal: 0-9 and A-F (case-insensitive).
Is my data processed on a server?
No. All conversions happen entirely in your browser using JavaScript. No data is sent anywhere.