Binary to Hex Converter

Each hexadecimal digit maps to exactly 4 binary digits, called a nibble. For example 1111 is f and 1010 is a, so every group of four bits becomes one hex digit and one byte of eight bits becomes two hex digits.

Hex is far shorter and easier to scan than binary while staying an exact base-two multiple. Programmers use it for memory addresses, byte values, color codes and bit masks because four bits pack neatly into a single character.

No. All whitespace is removed before the number is read, so 1111 1111 and 11111111 both give ff. Grouping bits into fours or eights only makes them easier for you to read.

That is fine. The converter reads the whole value rather than fixed nibbles, so padding is optional. Leading zeros are ignored, which means 11111111 and 0011111111 both give ff.

Yes. It parses the string with BigInt, so values far beyond the safe range of a normal JavaScript number stay exact. There is no fixed digit limit; the practical ceiling is your device memory.

Only the digits 0 and 1, plus spaces for grouping. Anything else, such as a 2, a letter, or an 0x prefix, is rejected with an "Invalid binary number" message.

The output is lowercase by default (ff), and the checkbox switches it to uppercase (FF). The value is identical; the case is only a style choice that some codebases or specifications prefer.

The output stays empty. Input that is only whitespace also produces no result. Type at least one 0 or 1 to get a hex value back.

No. The conversion runs entirely in your browser, so your binary number never leaves your device.