Hex String Converter
Fast, accurate, and free online Hex String Converter tool that runs directly in your browser.
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1Enter data
Enter content, paste text or load a file from disk. -
2Click the button
The tool will immediately process your data in the browser. -
3Get the result
Copy the finished text or save the file to your device.
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Other tools you may find usefulHEX String Converter - Text ↔ Hexadecimal
The HEX String Converter enables bidirectional conversion between text and the hexadecimal (hexadecimal) representation. Convert any string to hex bytes or decode hex back to text - a useful tool for developers, hackers and security analysts.
What is hexadecimal representation?
Hexadecimal (hex, base-16) is a base-16 positional system using the numbers 0–9 and the letters A–F. Each hex digit represents 4 bits (nibble), and two hex digits represent one byte (8 bits). For example, the letter 'A' in ASCII is 65 in decimal, 41 in hex (0x41). The hex system is widely used in computer science because it maps naturally to bytes and is more readable than binary.
Uses of HEX Conversion
Analyzing binary data – hex dump allows you to "see" the contents of a binary file. Programs such as xxd, hexdump and HxD display files in hex, which is necessary when analyzing file formats, network protocols or malware. Cryptography and security – Cryptographic keys, hashes (MD5, SHA) and tokens are often represented as hex strings. Low-Level Programming – CPU registers, memory addresses, and opcodes are expressed in hex. Colors in CSS/HTML – web colors are written in hex: #FF5733 = R: 255, G: 87, B: 51. Network Protocols – Wireshark and other network analyzers display packet data in hex.
How to use the converter?
Paste text in the "Text" field - the converter automatically converts each character to its hex value (UTF-8 encoding). Or paste a hex string in the "HEX" field (e.g.48 65 6c 6c 6for48656c6c6f) - the converter will decode it to text. Supported hex input formats: with or without separators (space, comma), with or without 0x prefix, uppercase and lowercase letters (A-F and a-f).
Important character encodings
When converting text→hex, the character encoding is important. ASCII uses 1 byte per character (for characters 0–127). UTF-8 uses 1-4 bytes per character - Polish diacritics (ą, ę, ó, ź) take up 2 bytes in UTF-8. For example, "ą" =C4 85in UTF-8. The converter uses UTF-8 by default, which is the standard for modern applications.
FAQ
How to convert a decimal number to hex?
You can do this in a number systems calculator or manually divide by 16 and write down the remainders. Example: 255 ÷ 16 = 15 remainder 15 (F), 15 ÷ 16 = 0 remainder 15 (F), result: FF. In JavaScript:(255).toString(16)= "ff". In Python:hex(255)= "0xff". The converter on this page supports text (strings), not direct numbers.
What does the 0x prefix before a hex number mean?
The 0x (zero-x) prefix is a programming convention that indicates that the following number is in hexadecimal. It comes from the C language and is used in C, C++, Java, Python, JavaScript and many other languages. Alternatively, the # prefix (in CSS, colors) or the H suffix (in assembler) is used.
How to decode hex dump to text?
Hex dump is a byte representation of data. To decode, take pairs of hex digits (one byte each), convert to decimal values and interpret as ASCII/UTF-8 codes. Our converter does it automatically. In terminal:echo "48656c6c6f" | xxd -r -pin Bash orbytes.fromhex("48656c6c6f").decode("utf-8")in Python.
Why can special characters be multibyte in hex?
UTF-8 is a variable-length encoding - ASCII characters (U+0000–U+007F) are 1 byte, European characters (U+0080–U+07FF) are 2 bytes, and non-European characters are 3–4 bytes. Polish "ą" (U+0105) = C4 85 in UTF-8 = 2 bytes. Emoji can occupy 4 bytes.