Number Base Converter
Convert numbers between Binary, Octal, Decimal, and Hexadecimal instantly. Real-time conversion with input validation — free online tool.
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About This Tool
- Real-time conversion between all number bases as you type
- Supports Binary (2), Octal (8), Decimal (10), and Hexadecimal (16)
- Automatic input validation for each base
- Completely free with no registration required
Frequently Asked Questions
A number base (or radix) defines how many digits are used to represent numbers. Decimal uses 10 digits (0-9), binary uses 2 (0-1), octal uses 8 (0-7), and hexadecimal uses 16 (0-9, A-F).
Binary (base 2) is the foundation of computing. Hexadecimal (base 16) is used for memory addresses, colors (#FF0000), and byte values. Octal (base 8) is used in Unix file permissions. Decimal (base 10) is for everyday math.
Hexadecimal is compact — one hex digit represents exactly 4 binary bits. So a byte (8 bits) is always 2 hex digits. This makes hex perfect for representing memory, colors, and binary data in a readable format.
Yes, completely free with no registration. Convert between number bases as many times as you need.