Decimal to Binary Converter
Convert decimal to binary in an instant. Type into any base and the others update live — and because the math uses BigInt, even 64-bit values stay exact. Everything runs in your browser.
- 🔒 100% private — no uploads
- 🆓 Free, no watermark
- 📱 Works on any device
How to convert
- 1
Enter a number
Type into any field — binary, octal, decimal or hexadecimal. Every other base updates at the same moment.
- 2
Read every base at once
There’s no direction to set: all the common bases show side by side, plus a custom-base (2–36) row for anything else.
- 3
Copy what you need
Each row has its own copy button. Values are computed with BigInt, so even 64-bit hexadecimal stays exact.
Why use Decimal to Binary Converter?
100% private
Runs entirely in your browser — nothing you type is uploaded or logged.
All bases at once
Binary, octal, decimal, hexadecimal and any base 2–36, all live and in sync.
Exact, no rounding
BigInt math means huge values (64-bit and beyond) convert without precision loss.
Works on any device
No install, no account — any modern browser on desktop or phone.
How decimal converts to binary
Divide by 2 repeatedly and read the remainders backwards: 13 → 6 r1 → 3 r0 → 1 r1 → 0 r1, giving 1101. Equivalently, subtract the largest power of two that fits, over and over: 13 = 8 + 4 + 1 = 1101.
Powers of two worth memorizing
2⁸ = 256, 2¹⁰ = 1024 (the “kilo” of KiB), 2¹⁶ = 65,536 and 2³² ≈ 4.29 billion — the range of a 32-bit integer. Spotting these in a number (a limit of 65,535, a port number, a 255 cap) usually means binary is hiding underneath.
Frequently asked questions
How do I convert decimal to binary?
Type your decimal value into its row; the binary row — and every other base — updates instantly.
Does it handle large / 64-bit numbers?
Yes. Values are computed with BigInt, so even 64-bit hexadecimal converts exactly, with no rounding.
Does anything get uploaded to a server?
No. The conversion runs entirely in your browser with JavaScript — nothing you type is uploaded, stored or logged, and it keeps working offline once the page has loaded.