Hex Encode/Decode-- Hexadecimal Converter

Encode text to hexadecimal or decode hex back to readable text instantly.

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Hex Output

Why Use Our Hex Encoder/Decoder?

Encode & Decode

Two-way conversion between text and hexadecimal in one tool.

Uppercase Hex

Clean, uppercase hex output for consistency and readability.

Input Validation

Validates hex input for even length and valid characters.

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All processing happens in your browser. Data never leaves.

One-Click Copy

Copy hex or decoded text to clipboard instantly.

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Complete Hexadecimal Encoding Guide

Hexadecimal encoding converts data into a base-16 number system representation using digits 0-9 and letters A-F. Each byte of data (8 bits) is represented by exactly two hex digits, making it a compact and human-readable way to represent binary data. For text encoding, each character's code point value is converted to its hex equivalent.

For example, the letter 'H' has ASCII code 72, which in hexadecimal is 48. The word "Hello" becomes "48656C6C6F". This one-to-one mapping between bytes and hex pairs makes hexadecimal ideal for inspecting raw data, debugging, and working with low-level system representations.

Hexadecimal is fundamental to computing because it maps perfectly to binary: each hex digit represents exactly 4 bits (a nibble), and each hex pair represents exactly 1 byte. This makes mental conversion between hex and binary straightforward - something decimal doesn't offer. A byte ranging from 0 to 255 in decimal maps to 00 to FF in hex.

Our free tool converts text to uppercase hex and decodes hex strings back to text. All processing happens locally in your browser with no server communication.

The encoding process takes each character, retrieves its numeric code point value, then converts that number to hexadecimal. Each hex digit represents 4 bits, and since most characters in common encodings use 8-bit (1-byte) values, the result is typically 2 hex digits per character.

Character	Decimal	Hex	Binary
H	72	48	01001000
e	101	65	01100101
l	108	6C	01101100
!	33	21	00100001

Decoding reverses the process: each pair of hex digits is parsed as a base-16 number, converted to a decimal code point value, and then to the corresponding character. Whitespace in hex input is stripped before parsing.

Binary Data Inspection

Hex editors display file contents as hex for debugging. Examine file headers, magic bytes, and binary protocols in a readable format.

Network Debugging

Wireshark and tcpdump show packet data in hex. Understanding hex is essential for network protocol analysis and debugging.

CSS Color Codes

CSS colors use hex notation (#RRGGBB). Understanding hex helps you read and compose colors: #FF0000 is red, #00FF00 is green, #0000FF is blue.

Memory Addresses

Memory addresses in debuggers and system tools are displayed in hex (e.g., 0x7FFF5FBFF000). Hex provides compact representation of large address values.

Cryptographic Hashes

Hash values (MD5, SHA-256) are typically displayed as hex strings. A SHA-256 hash produces 64 hex characters representing 32 bytes.

MAC Addresses

Network interface MAC addresses use hex notation (e.g., 00:1A:2B:3C:4D:5E). Each pair represents one byte of the 6-byte hardware address.

Different encoding schemes serve different purposes. Understanding the tradeoffs helps you choose the right one:

Encoding	Characters Used	Size Overhead	Best For
Hexadecimal	0-9, A-F (16)	100% (2x)	Debugging, inspection, addresses
Base64	A-Z, a-z, 0-9, +, / (64)	33% (4/3x)	Data transmission, embedding
Binary	0, 1 (2)	700% (8x)	Bit-level analysis, education

Hex is the best choice when you need to inspect individual bytes and understand data at the byte level. Base64 is more space-efficient for transmitting larger amounts of binary data. Binary representation is useful for understanding bit patterns but is impractical for large data.

What is hexadecimal encoding?

Hexadecimal (hex) encoding converts each character in text to its two-digit hex representation based on the character's code point. For example, 'A' (ASCII 65) becomes '41', and 'Hello' becomes '48656C6C6F'.

What is hexadecimal decoding?

Hex decoding reverses the process, converting pairs of hex digits back to their corresponding characters. For example, '48656C6C6F' decodes back to 'Hello'.

Why is hexadecimal used in computing?

Hexadecimal provides a compact, human-readable representation of binary data. Each hex digit represents exactly 4 bits, making it ideal for representing bytes (2 hex digits = 1 byte). It's used for memory addresses, color codes, MAC addresses, and binary data inspection.

Is hex encoding the same as Base64 encoding?

No. Hex encoding uses 16 characters (0-9, A-F) and produces 2 characters per byte (100% overhead). Base64 uses 64 characters and produces 4 characters per 3 bytes (33% overhead). Base64 is more space-efficient for large data.

What characters are valid in hex?

Hexadecimal uses exactly 16 characters: the digits 0-9 and the letters A-F (or a-f, case insensitive). Each hex digit represents a value from 0 to 15 in decimal.

Can I encode Unicode text to hex?

Our tool encodes each character's code point value as hex. For ASCII characters, this produces 2-digit hex pairs. For characters with higher code points, the hex representation may be longer.

Is my data secure during conversion?

Yes, all processing happens locally in your browser using JavaScript. Your text never leaves your device, is never transmitted to any server, and is never stored.

What about spaces in hex strings?

Our decoder strips whitespace from hex input before decoding, so you can paste hex with or without spaces between byte pairs. Both '48 65 6C' and '48656C' decode to 'Hel'.

How is hex used in web development?

Hex is used for CSS color codes (#FF5733), URL percent-encoding (%20), character code references, debugging network packets, and inspecting binary file contents.

What happens with odd-length hex strings?

Valid hex strings must have an even number of characters since each byte requires exactly two hex digits. Our decoder validates this and shows an error for odd-length inputs.

Hex Encode/Decode Tool

Why Use Our Hex Encoder/Decoder?

Other Encoding Tools

Complete Hexadecimal Encoding Guide