Decimal to Binary Converter
This decimal to binary converter expresses any base-10 integer as a string of ones and zeros. It uses arbitrary-precision arithmetic so even very large numbers convert exactly.
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What this tool does
Representing a base-10 integer in base-2 by repeated division. This decimal to binary converter is free, works on desktop and mobile, and requires no sign-up.
Also useful for: 1 to 10 binary numbers, 10 to binary, 100 decimal to binary, 100 to binary, 10000 to binary, 11 to binary, 110 to binary, 128 to binary.
Features
- Exact conversion for large integers
- Live output
- Clean binary string
- Copy to clipboard
How to use it
- Enter a decimal number
- Read its binary form
- Copy the bit string
Examples
Answer to everything
42101010 Common uses
- Learning binary representation
- Preparing bit masks
- Checking flag values
Good to know
- Integer input only
Frequently asked questions
Does it pad to a byte?
No, output is the minimal binary representation without leading zeros.
Any maximum value?
No practical maximum thanks to BigInt.