Number Base Converter — Decimal Binary Hex Octal Free Online
ConverterConvert numbers between decimal, binary, hexadecimal and octal instantly. Live conversion as you type. Visual bit representation. Free online number base converter.
About the Number Base Converter — Decimal Binary Hex Octal Free Online
Our free number base converter converts numbers between Decimal (base 10), Binary (base 2), Hexadecimal (base 16) and Octal (base 8) in real time as you type. Change any field and all others update instantly. A visual bit representation shows the 8-bit and 16-bit binary layout. Useful for computer science students, programmers and hardware engineers working with low-level programming and memory addressing.
How to Use the Number Base Converter — Decimal Binary Hex Octal Free Online
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Type a number into any field — Decimal, Binary, Octal or Hexadecimal.
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All other fields update instantly.
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View the 8-bit and 16-bit visual representation below.
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Click Copy next to any field to copy that value.
Frequently Asked Questions
How do I convert decimal to binary?
Enter your decimal number in the Decimal field and read the Binary field result. E.g. decimal 255 = binary 11111111.
What is hexadecimal used for?
Memory addresses, color codes (#CE2626), byte values, HTML/CSS colors. One hex digit represents exactly 4 binary bits.
What is octal used for?
Unix/Linux file permissions (e.g. chmod 755) and legacy computing systems.
What does the bit representation show?
Your number as 8 binary digits. Red cells = 1 bits, grey = 0 bits. 16-bit shows the same across 16 bits.