Free Online Number Base Converter — Decimal, Hex, Octal, Binary
Convert numbers between decimal, hexadecimal, octal, and binary with HubKit's number base converter. Essential for programming, debugging, working with memory addresses, bitwise operations, color codes, and understanding how computers represent data at the hardware level.
How to Use
Enter a number in any base — decimal, hexadecimal (0x prefix), octal (0o prefix), or binary (0b prefix). The tool instantly shows the equivalent value in all four bases.
Features
- Convert between decimal, hex, octal, and binary
- Real-time conversion as you type
- Support for large numbers
- Copy any converted value with one click
Frequently Asked Questions
What are common uses for hexadecimal numbers?
Hexadecimal (base 16) is used for color codes (#FF5733), memory addresses, MAC addresses, Unicode code points, and byte-level data representation. Each hex digit represents exactly 4 bits.
Why do computers use binary?
Computers use binary (base 2) because digital circuits have two states: on (1) and off (0). All data — text, images, code — is ultimately stored and processed as binary numbers.
What is octal used for?
Octal (base 8) is used in Unix/Linux file permissions (chmod 755), some programming languages, and legacy systems. Each octal digit represents exactly 3 bits.