Decimal to Binary Converter
Free online decimal to binary converter with steps — instant, accurate decimal to binary conversion in your browser.
Supports arbitrarily large non-negative integers (BigInt under the hood).
Runs entirely in your browser — nothing you enter is uploaded or stored.
About decimal to binary conversion
Number bases are different ways of writing the same value: binary (base 2) uses 0–1, octal (base 8) 0–7, decimal (base 10) 0–9 and hexadecimal (base 16) 0–9 plus A–F. This converter parses your input as an arbitrary-precision integer and re-renders it in the target base — instantly and privately, in your browser.
Quick reference
1010binary =12octal =10decimal =Ahex- Hexadecimal digits:
A=10, B=11, C=12, D=13, E=14, F=15 - Each octal digit maps to 3 binary digits; each hex digit maps to 4
Frequently asked questions
How do I convert decimal to binary manually?
Repeatedly divide the decimal number by 2, writing down each remainder — then read the remainders from bottom to top. This tool does it instantly for any size of number.
What is decimal 500 in binary?
500 in decimal equals 111110100 in binary.
Is this converter free and private?
Yes — free, no sign-up, and the conversion runs locally in your browser using arbitrary-precision integers. Nothing is uploaded.