$ base
Number Base Converter
Convert numbers between binary, octal, decimal and hexadecimal, with two\x27s complement and bit breakdown for any width.
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Reading the details
Grouped binary shows nibbles (4 bits) so you can map each group to one hex digit. Two\x27s complement is how CPUs store negative integers: a negative decimal is shown as the unsigned pattern it occupies at the chosen bit width. Prefixes 0x, 0b and 0o are accepted in the input fields. Values use BigInt, so 64-bit numbers are exact.