Integer Base Converter
Instantly convert numbers between decimal, hexadecimal, octal, and binary. Supports huge numbers and BigInt precision.
How to Use
Our free online Integer Base Converter allows you to seamlessly translate numbers between the four most common computing bases: Decimal, Hexadecimal, Octal, and Binary.
- Enter your number into any of the four input fields. You can start with a decimal, hex, octal, or binary number.
- Watch it convert instantly. As you type, the other three fields will automatically update with the converted values.
- Copy the result using the copy icon next to any field. The copied value will be stripped of formatting spaces/commas so it is ready to paste directly into your code.
About This Tool
Number bases represent the number of unique digits (including zero) used to represent numbers in a numeral system.
- Decimal (Base 10): The standard system used by humans, containing 10 digits (0-9).
- Binary (Base 2): The fundamental language of computers, containing only 2 digits (0 and 1).
- Hexadecimal (Base 16): Widely used in programming and memory addressing, containing 16 digits (0-9 and A-F).
- Octal (Base 8): Often used in Unix file permissions, containing 8 digits (0-7).
Why Use This Tool
Most built-in operating system calculators or basic web tools struggle with very large numbers. In standard JavaScript, numbers lose precision beyond 15 digits (known as Number.MAX_SAFE_INTEGER).
Our converter is built using modern BigInt technology, meaning it can accurately convert massive numbers (hundreds of digits long) without rounding errors or scientific notation truncation. Furthermore, everything is calculated instantly in your browser without requiring a server request.