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Binary Converter

Convert decimal to binary and hex, or binary to decimal. Free, accurate, instant, no sign-up.

๐Ÿ“– Read the complete Binary Converter guide โ†’

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Result

Formula

Decimalโ†’Binary: repeated division by 2 | Binaryโ†’Decimal: sum of 2^pos ร— digit

Example

42 decimal โ†’ 101010 binary โ†’ 0x2A hex

Frequently Asked Questions

What is binary used for?

All computer data is stored in binary โ€” 1s and 0s representing on/off states.

What is hexadecimal?

Base-16 number system using 0-9 and A-F. Used in colour codes and memory addresses.

What is the largest 8-bit binary number?

11111111 = 255 decimal = 0xFF hex.

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