Binary to Decimal Converter
Convert binary numbers to decimal instantly, with no size limit.
Converts live as you type, entirely in your browser using arbitrary-precision math — no size limit and nothing is sent anywhere.
Need the opposite? Use Decimal to Binary Converter
What is Binary to Decimal Converter?
Paste a binary number (made only of 0s and 1s) and get its decimal equivalent instantly. Uses arbitrary-precision math under the hood, so there's no limit on how large a number you can convert. Binary-to-decimal conversion comes up whenever you're reading raw register values, network packet flags, or low-level embedded output and need the human-readable number behind the 0s and 1s. Because this uses BigInt rather than a fixed-width integer type, it stays accurate even on binary strings far longer than a normal 32- or 64-bit number, and it runs entirely in your browser — nothing you paste is sent anywhere.
FAQ
Any string made only of the digits 0 and 1. Anything else (letters, spaces, other digits) is flagged as invalid.
No — the conversion uses JavaScript's BigInt, so arbitrarily long binary numbers convert without losing precision.
Enter the number as a plain unsigned binary string; this tool converts the magnitude, not a signed (two's-complement) representation. If you're working with signed values, apply your platform's sign convention to the result yourself.
Yes, use the Decimal to Binary Converter.