Converting binary to hexadecimal is one of the most common tasks in low-level programming, because hex is a far more compact and readable way to write the same bit pattern. This converter turns any base-2 string into base-16 directly, grouping the bits into nibbles exactly as you would by hand.
How it works
Hexadecimal is base 16, and 16 equals 2 to the fourth power. That relationship means each hexadecimal digit corresponds to precisely four binary digits, a group called a nibble. To convert, you split the binary string into nibbles starting from the right, then translate each nibble into its single hex digit using this fixed map: 0000 is 0, 1010 is A, 1111 is F, and so on.
No conversion to decimal is required at any point. The tool left-pads the binary string with zeros until its length is a multiple of four, slices it into nibbles, looks up each one, and concatenates the results.
Example
Take the binary string 10101111. Split into nibbles: 1010 and 1111. The first maps to A (decimal 10) and the second to F (decimal 15). Concatenated, the result is AF, conventionally written 0xAF, which equals 175 in decimal.
Tips and notes
You can paste long bit strings with spaces or underscores for readability, such as 1010_1111; the separators are stripped before conversion. The per-nibble breakdown is useful for learning the mapping by sight. All processing happens locally in your browser, so nothing you enter is transmitted anywhere.