Hex to Binary Converter — Hexadecimal to Base-2 Online

Convert a hex string to its binary (base-2) representation. Each hex character becomes 4 bits; output grouped as 4 bits per hex char or 8 bits per byte. Ignores '0x' prefixes and any separators automatically. 100% local.

Last updated: July 20, 2026

Group size:

Hex

13 chars · 1 lines

Binary

01001010 01001011 01001100 01001101

Need to go the other way? Binary to Hex →

Paste hex to get its binary (base-2) representation. Each hex digit is exactly 4 bits (0 → 0000, F → 1111). Group output as 4 bits per hex char or 8 bits per byte. Ignores '0x' prefixes and any separators.

What is Hex to Binary?

Hex-to-binary is a fixed 4-bit-per-digit mapping — no encoding assumption needed. This makes it a pure, unambiguous transformation, unlike text-to-binary which depends on the character encoding. The tool strips every non-hex character from the input (so '0x' prefixes, spaces, commas, newlines are all fine) then expands each hex digit to its 4-bit representation. Output grouping is your choice: 4 bits per hex char is closer to the mental model when reading hex 'digit by digit'; 8 bits per byte is closer to how the computer sees the bytes and is what most protocols document.

How to convert hex to binary online

1Paste hex — any format with hex digits (0-9, a-f, A-F). Separators and '0x' prefixes are ignored.
2Pick group size: 4 bits per hex char (finer) or 8 bits per byte (protocol-standard).
3Copy the output — spaces separate groups for readability.

Use Cases

Inspect flag bits in a status byte

Hex 0x4A → 0100 1010 makes it obvious which bits are set — much easier than doing math in your head.

Explain bit-level protocols

Show the bit layout of a network header, IP address, or memory-mapped register in a talk or blog post.

Debug a hash output byte-by-byte

See the actual bit pattern of a SHA-256 digest for cryptographic-property demos.

Tips & Best Practices

▸4-bit grouping (each hex char → 4 bits, spaced) is easiest to read when the input is short. 8-bit grouping matches how CPU / memory work — better for long inputs.
▸This tool is exact, not encoding-dependent. Text-to-binary goes through UTF-8 first; hex-to-binary just remaps digits.
▸For big-endian vs little-endian debates, the tool doesn't reorder bytes — it outputs bits in the same order as the input hex.

Frequently Asked Questions

How does hex map to binary?

Each hex digit is exactly 4 bits: 0 = 0000, 1 = 0001, …, F = 1111. So the hex byte 4A becomes 01001010 (8 bits). The tool lets you group the output as 4 bits per hex character or 8 bits per byte for readability.

Does the tool understand '0x' prefixes?

Yes — all non-hex characters (0x prefixes, spaces, commas, newlines) are stripped before conversion. So '0x4a 0x42' and '4a42' produce identical output.

Is this different from decimal-to-binary?

Yes. Decimal-to-binary interprets the input as a single number and outputs the same value in base-2. This tool works byte-by-byte — a common need when inspecting byte-level protocols, hash outputs, or memory dumps.

What happens with an odd number of hex characters?

Each hex character still becomes 4 bits — an odd count simply produces a trailing 4-bit group instead of a full byte. To force even lengths (byte-aligned), prepend a 0.

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