🔢 Number Base Converter

Convert between Binary, Decimal, Octal, and Hex instantly.

Binary (Base 2)

Octal (Base 8)

Decimal (Base 10)

Hexadecimal (Base 16)

Enter a number in any field to convert instantly.

Free Online Number Base Converter

ToolBox Number Base Converter helps developers, students, and engineers convert values between binary, decimal, octal, and hexadecimal formats instantly.

All conversions run fully inside your browser — no uploads, no tracking, completely private.