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Binary to Hex

Convert binary numbers to hexadecimal — enter, convert, and copy instantly.

Input Binary
Output Hex
Hex output will appear here...
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About Binary to Hex Converter

Binary to Hex Converter translates base-2 numbers — strings of 0s and 1s — into base-16 hexadecimal notation using digits 0 through 9 and letters a through f. The relationship between the two bases is exact: every group of four binary digits maps to exactly one hex digit, making hex the most compact and lossless way to represent raw binary data. That compactness is why hexadecimal appears everywhere in computing: memory addresses in debuggers, RGB color codes in CSS, MAC addresses in networking, and byte sequences in file headers all rely on hex rather than the unwieldy raw binary they represent.

This tool is purpose-built for the hex output format specifically — not decimal integers, not ASCII text. When you are reading a disassembler listing, writing a hardware register value, or checking a checksum against a datasheet, you need hex, not a decimal number. Enter one binary value per line for batch conversion; the tool processes each line independently and returns a matching list of hex values so the positional relationship is preserved. BigInt arithmetic handles values longer than 53 bits without losing precision, so 64-bit addresses and wide bus widths are covered.

All conversion runs entirely inside your browser. No binary data is uploaded, logged, or transmitted anywhere — a useful guarantee when converting values from proprietary firmware, internal memory maps, or security-sensitive hardware registers. The tool is free, requires no account, and imposes no input size limits beyond your browser's own memory.

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Key Features

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Four-bits-per-digit mapping

Each hex digit exactly represents four binary digits, so the output length is always ceil(input_length / 4) — predictable and lossless with no rounding.

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Multi-line batch mode

Enter multiple binary numbers on separate lines and receive the same number of hex values back, preserving position for easy comparison in spreadsheets or scripts.

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BigInt precision for wide values

Numbers wider than 53 bits — 64-bit CPU registers, AXI bus addresses, LFSR polynomials — are converted using BigInt so no bits are silently lost.

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Lowercase hex output

Output uses lowercase a-f by convention, matching the format expected by most hex editors, debuggers, and CSS color specifications.

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Strict input validation

Any character other than 0 or 1 immediately surfaces a clear error instead of silently producing a wrong result, catching stray spaces or copy-paste artifacts before they cause bugs.

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Runs entirely in your browser

No server round-trips. Firmware byte sequences, hardware register values, and network frame data never leave your machine.

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How to Use

01

Enter Binary Number

Type or paste your binary number into the input area. You can enter multiple numbers on separate lines for batch conversion.

02

Convert

Click "Convert" to calculate the hexadecimal equivalent of your binary input. Each line is converted independently.

03

Copy Result

Copy the hex result to your clipboard with one click using the copy button in the toolbar.

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Example

Four binary byte values are converted to their hex equivalents. Each input line produces one output line; the four-bit grouping is visible in the f0 result (1111 = f, 0000 = 0).

Binary input
11110000
1010
11111111
100000000
Hex output
f0
a
ff
100
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Common Use Cases

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    Reading memory dumps and debugger output

    Debuggers and memory viewers display addresses and byte values in hex. Converting the raw binary values you see in a register window or bus trace directly to hex lets you cross-reference them against datasheets and linker map files without any intermediate decimal step.

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    Constructing CSS and SVG color values

    RGB color channels are often specified as 8-bit binary values in hardware or design specs. Converting each 8-bit binary channel to two hex digits gives you the #rrggbb format CSS expects — for example, 11111111 00000000 00000000 becomes #ff0000.

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    Writing firmware register values

    Microcontroller and FPGA datasheets define control registers as bit fields. Converting your planned binary bit pattern to hex before writing it to code avoids magic decimal numbers and makes the value self-documenting for reviewers who can compare it to the datasheet layout.

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    Verifying network frame fields

    Ethernet frames, IP headers, and protocol fields are described in binary but transmitted and logged in hex. Converting captured binary field values to hex lets you match them against Wireshark output or RFC byte diagrams quickly.

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    Encoding binary data for hex literals in source code

    Languages like C, Rust, and Python accept hex literals (0xFF) in byte arrays and bitmasks. Converting a binary representation to hex is the last step before embedding a constant into source code with a clear, compact notation.

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Frequently Asked Questions

What is binary to hex conversion? expand_more
Binary to hex conversion translates a base-2 number (using only digits 0 and 1) into a base-16 number (using digits 0-9 and letters a-f). Every four binary digits correspond to exactly one hex digit — for example, binary 1111 equals hex f, and binary 11110000 equals hex f0.
How does binary to hex conversion work? expand_more
The simplest method is to group the binary digits into sets of four starting from the right, then convert each group to its hex equivalent. For example, 11111111 splits into 1111 1111, which converts to ff. If the leftmost group has fewer than four digits, pad it with leading zeros.
Can this tool handle very large binary numbers? expand_more
Yes. For binary numbers longer than 53 bits (which exceed the precision of standard JavaScript numbers), the tool automatically uses BigInt to perform the conversion with full accuracy. There is no practical limit on the size of binary input.
Is my data secure? expand_more
Absolutely. All conversion happens entirely in your browser using client-side JavaScript. No data is sent to any server, so your binary input and hex output remain completely private.
How is Binary to Hex different from Binary to Decimal? expand_more
Binary to Decimal converts a binary number to a base-10 integer (e.g., 11110000 becomes 240). Binary to Hex converts the same number to base-16 (11110000 becomes f0). Use decimal when you need a human-readable count or arithmetic result; use hex when the output must match a format like a memory address, color code, or register value that is conventionally expressed in base-16.
How is Binary to Hex different from Binary to Text? expand_more
Binary to Text interprets groups of eight binary digits as ASCII character codes and returns a readable string (e.g., 01001000 01101001 becomes "Hi"). Binary to Hex simply converts the numeric value to base-16 notation without any character interpretation. Use this tool when you have numeric binary values; use Binary to Text when you have encoded character data.
Why does the output use lowercase letters? expand_more
The tool outputs lowercase hex digits (a-f) because that is the convention used by most hex editors, debuggers like GDB, CSS color values, and Unix tools such as xxd. If you need uppercase, copy the output and use a text transform; the numeric value is identical either way.
Can I convert multiple binary numbers at once? expand_more
Yes. Enter each binary number on its own line and click Convert. The tool processes every line independently and returns the same number of lines of hex output, preserving the original order so you can compare input and output positions side by side.