Binary to Decimal Converter
Convert binary to decimal 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 Binary to Decimal 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 binary converts to decimal
Each binary digit is a power of two, doubling from right to left: 1, 2, 4, 8, 16… Add up the places holding a 1. For example, 1011 = 8 + 0 + 2 + 1 = 11, and 11111111 = 255 — the largest value of one byte.
Reading binary like a programmer
Eight bits make a byte (0–255), and file permissions, subnet masks and flag registers are all just bits read as numbers. For long binary strings, convert via hex: group the bits in fours and read each group as one hex digit — 1111 0011 is F3 is 243.
Frequently asked questions
How do I convert binary to decimal?
Type your binary value into its row; the decimal 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.