A free online number base converter. Convert between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16) in real-time. Supports large numbers using BigInt. Perfect for programming, electronics, and computer science work.
Type or paste a number in any base field.
All other bases update instantly in real-time.
Binary is grouped by 4 bits for readability.
Copy any result with the copy button.
Binary is a base-2 number system that uses only two digits: 0 and 1. It is the fundamental language of computers, representing data as sequences of bits.
Each bit represents a power of 2. Multiply each digit by its positional value (1, 2, 4, 8, ...) and sum the results. For example, 1010 = 8+0+2+0 = 10 in decimal.
Free online tool — works in your browser, no sign-up required. Start using it right now.
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