Number Base Converter
Convert numbers between binary, octal, decimal and hexadecimal.
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Convert numbers between binary (base 2), octal (base 8), decimal (base 10) and hexadecimal (base 16). Pick your input base, enter a value, and get all the other bases at once. It is essential for programming, low-level debugging and computer-science study. Everything runs in your browser.
Frequently asked questions
How do I convert between number bases?
Enter a value, choose its input base, and the tool shows the binary, octal, decimal and hexadecimal equivalents.
What is hexadecimal used for?
Hex is a compact way to write binary, common in colours (#ff8800), memory addresses and byte values.
Can it convert hex to decimal?
Yes — set the input base to hexadecimal and enter the value to get its decimal (and other) forms.
Is my input uploaded?
No, the conversion happens in your browser.