Read binary by place value
For 11111111, every 8-bit position is on: 128 + 64 + 32 + 16 + 8 + 4 + 2 + 1 = 255. Use the 8-bit chart when you want to check each value at a glance.
Binary Converter
Convert binary and decimal whole numbers with arbitrary precision.
Decimal
How binary number conversion works
Example
11111111 255 - Binary is a base-2 number system that uses only the digits 0 and 1.
- Each position represents a power of two, starting with 2⁰ at the right edge.
- EncodeLab uses arbitrary-precision integers, so large whole numbers are not rounded.
Binary numbers are not text bytes
This converter works with whole numbers. To encode words or emoji, use Text to Binary, which writes UTF-8 text bytes rather than one numeric value.
Common binary number examples
Binary 101010 equals decimal 42, binary 11111111 equals 255, and binary 100000000 equals 256. Leading zeroes do not change a number, but they do matter when you are displaying a fixed-width byte.
Related tools
Binary Translator Translate text and binary instantly. Everything stays in your browser. Text to Binary Converter Convert words, symbols, and emoji into UTF-8 binary bytes. Binary to Text Converter Decode valid 8-bit binary bytes into readable UTF-8 text. Hex to Decimal Converter Convert hex and decimal whole numbers with arbitrary precision. Hex Converter Translate text and hexadecimal UTF-8 bytes in either direction. ASCII Converter Convert text and decimal character code points in either direction.
Frequently asked questions
What does binary 11111111 equal?
Binary 11111111 equals decimal 255.
Is my input uploaded?
No. EncodeLab performs this conversion locally in your browser. Your input is not sent to an EncodeLab server or stored by us.
Can this converter handle large numbers?
Yes. It uses arbitrary-precision integers instead of floating-point arithmetic.
Does it convert binary fractions?
This version converts whole numbers only and does not currently accept a binary point.