Number Base Converter
Convert numbers between binary, octal, decimal, hex and any base.
Number Base Converter
Developer tool running locally in browser
What does Number Base Converter do?
Convert integers between any bases from 2 to 36 with exact arithmetic, so very large values never lose precision. Binary, octal, decimal and hexadecimal are shown together, and any custom base is a field away.
How to Use Number Base Converter
- 1Enter a numberIn whichever base you have.
- 2Select that baseOr use one of the labelled fields.
- 3Read every other baseThey all update together.
Key Features
- Binary, octal, decimal and hexadecimal shown simultaneously
- Any custom base from 2 to 36
- BigInt arithmetic, so hundred-digit numbers convert exactly
- Optional digit grouping for readability
- Bit length and byte size reported for the value
Frequently Asked Questions
How do I convert binary to decimal?
Multiply each digit by 2 raised to its position from the right and add them up. 1011 is 8 + 0 + 2 + 1 = 11.
Why is hexadecimal used so much in computing?
Because one hex digit is exactly four bits, so a byte is always two hex digits. That makes hex a compact, exact shorthand for binary — which decimal never is.
What is base 36?
Digits 0–9 followed by letters a–z, giving the most compact representation using only alphanumeric characters. It is used for short IDs and URL slugs.
Can it convert negative numbers?
Yes, using a minus sign. Two’s complement representation is a different concept — it depends on a fixed bit width, which this converter does not assume.
Input is processed in your browser and never transmitted. That said, treat any web page as untrusted for live production secrets — rotate anything you paste anywhere.
Related Tools
Binary to Decimal Converter
Convert binary numbers to decimal with the working shown.
Decimal to Binary Converter
Convert decimal numbers to binary with the division steps.
Hex to Decimal Converter
Convert hexadecimal numbers to decimal.
Decimal to Hex Converter
Convert decimal numbers to hexadecimal.