Number Base Converter Online Free — Hex, Decimal, Binary, Octal (2026)

Q: How do I convert hex to decimal?

In JavaScript, use parseInt(hexString, 16) to convert hex to decimal. Each hex digit represents 4 bits, making it a compact way to represent binary values.

Q: How do I convert decimal to binary?

Divide the decimal number by 2 repeatedly, reading the remainders from bottom to top. Or use number.toString(2) in JavaScript.

Q: Is this tool private?

Yes — everything runs in your browser. Your numbers never leave your computer.

Convert numbers between hexadecimal, decimal, binary, and octal number systems — all in your browser, free, with nothing uploaded.

Common Number Systems

Binary (Base 2): Uses digits 0 and 1. The language of computers. Each digit is a bit.
Octal (Base 8): Uses digits 0-7. Often used in Unix file permissions and legacy systems.
Decimal (Base 10): The standard human number system. Uses digits 0-9.
Hexadecimal (Base 16): Uses digits 0-9 and letters A-F. Common in programming for colors, memory addresses, and binary shorthand.

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Frequently Asked Questions

How do I convert hex to decimal?
Use parseInt(hexString, 16) in JavaScript. Each hex digit represents 4 bits.

How do I convert decimal to binary?
Divide by 2 repeatedly and read remainders bottom-to-top, or use number.toString(2).

Is this tool private?
Yes — everything runs in your browser. Nothing leaves your computer.

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