Decimal to Binary Converter
Convert decimal numbers to binary, with hex and octal alongside.
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Hex
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Octal
Fractional parts are converted with up to 24 binary places. Binary is position-2 notation: 1011 = 1·8 + 0·4 + 1·2 + 1·1 = 11.
How to use the Decimal to Binary tool
- Enter your decimal to binary in the fields above.
- Adjust any slider or type an exact number — the answer updates as you go.
- Copy the result and close the tab. Nothing you entered was sent anywhere.
About the Decimal to Binary tool
Type a decimal number and the binary form appears instantly, with optional 4-bit or byte grouping and 0x hex and 0o octal values as a bonus.
Binary is position-2 notation, so each digit doubles its weight from right to left — 1011 is 8+0+2+1 = 11.
Everything runs locally in your browser: no data is uploaded, no account is needed, and it works offline once the page has loaded.
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