Binary to Hex Converter

Q: Can I convert many binary numbers at once?

Yes. Put one number per line and every line is converted, with the results lined up against the input. A line that is not a valid binary number is left blank and reported by line number, so one typo does not stop the rest.

Q: Why is binary to hex so easy?

Because 16 is 2^4, one hex digit holds exactly four bits. Split the binary into groups of four from the right and replace each group with its hex digit, 0000 = 0 up to 1111 = F. No division is needed.

Q: What does the 0x prefix mean?

It marks a number as hexadecimal in C, JavaScript, Python and most other languages, so 0x10 is sixteen rather than ten. Tick the prefix option to add it.

Q: Uppercase or lowercase hex?

They are the same value. Uppercase is common in documentation and hardware manuals; lowercase is common in hashes, URLs and CSS colours. Pick whichever the destination uses.

Convert binary to hexadecimal instantly — nibble by nibble — with byte padding, 0x prefixes and bulk conversion.

Binary

Hex

Group digits Add 0x / 0b / 0o prefix Uppercase hex Pad to whole bytes

What It Does

This converter turns binary into hexadecimal. The two bases line up exactly: every group of four bits, counted from the right, is one hex digit, which is why programmers use hex as compact binary. The tool groups and converts for you, pads to whole bytes on request, and can add the 0x prefix most languages expect.

When to Use It

You worked out a bit mask in binary and need it as a hex constant for code.
A datasheet lists register bits and your debugger shows hex.
You are compressing a long binary string into something you can read aloud.
You need to check a hand conversion nibble by nibble.

Worked Examples

11110000

1111 is F and 0000 is 0, so F0. Each nibble maps to one hex digit.

101

Padded on the left to 0101, which is 5. Leading zeros never change the value.

1101 1110 1010 1101 1011 1110 1110 1111

Groups of four become DEADBEEF — the classic debug marker value.

Features

Converts as you type

Bulk conversion one number per line

Exact for numbers of any size

Digit grouping and 0x/0b/0o prefixes

Swap direction in one click

Explains bit width and two's complement

How to Use

1. Type or paste a binary number — or a list, one per line. 2. The hex value appears alongside, line for line. 3. Use the options to group digits or add a prefix, and the swap button to convert the other way.

Common Mistakes

Converting a number through a JavaScript Number. Above 9,007,199,254,740,991 it silently rounds, so the last digits come out wrong. This tool uses BigInt and stays exact at any size.
Forgetting that the same digits mean different values in different bases. 10 is ten in decimal, two in binary, eight in octal and sixteen in hex — always label which base a value is in.
Treating a minus sign as how a computer stores a negative number. Hardware uses two's complement, so a negative value's bit pattern looks nothing like its positive counterpart.

Frequently Asked Questions

Can I convert many binary numbers at once?

Why is binary to hex so easy?

What does the 0x prefix mean?

Uppercase or lowercase hex?

Conversion runs in your browser with exact integer arithmetic. Nothing is uploaded.