Hex Encoder / Decoder
Convert text to hexadecimal and back. Support for hex with/without spaces, uppercase/lowercase output with auto-encode on input.
About Hex Encoder / Decoder
Our free online Hex Encoder / Decoder is a powerful tool that converts text to and from hexadecimal format. Hexadecimal (base-16) encoding represents each byte of data as a two-digit hexadecimal number using characters 0-9 and A-F.
Hex encoding is widely used in programming, data analysis, color codes (CSS colors like #FF5733), memory dumps, network protocol analysis, and cryptography. It provides a human-readable representation of binary data that is much easier to work with than raw binary.
This tool processes your input entirely in the browser using JavaScript, ensuring your data never leaves your device. Encode or decode hexadecimal instantly with support for multiple output formats including lowercase, uppercase, space-separated, and 0x-prefixed formats.
The auto-encode/decode feature updates the output in real-time as you type, making it convenient for quick conversions. You can also swap input and output for bidirectional conversion with a single click.
Features
Fast Encoding
Encode and decode hexadecimal instantly with no registration or limits. Completely free to use.
Auto-Calculate
Automatically update the output as you type for real-time hexadecimal conversion.
Multiple Formats
Support for lowercase, uppercase, space-separated, and 0x-prefixed hexadecimal output.
Swap Input/Output
Quickly swap input and output for easy bidirectional conversion.
One-Click Copy
Copy the encoded or decoded result to clipboard with a single click.
Privacy First
All processing happens in your browser. Your data never leaves your device.
How to Use
Enter Your Text
Type or paste the text you want to encode or decode into the input editor on the left.
Select Mode and Format
Choose Encode or Decode mode, and select the output format (lowercase, uppercase, space-separated, or 0x-prefixed).
Encode or Decode
Click Encode / Decode or enable auto-calculate for real-time hexadecimal conversion.
Copy the Result
Click Copy to copy the encoded or decoded result to your clipboard.
Frequently Asked Questions
What is hexadecimal encoding?
Hexadecimal encoding represents binary data using base-16 numbers (0-9 and A-F). Each byte (8 bits) is represented by two hexadecimal digits. For example, the letter "A" (ASCII 65) is encoded as "41" in hexadecimal. It is a compact, human-readable way to represent binary data.
When is hexadecimal encoding used?
Hexadecimal encoding is used in many areas: memory dumps and debugging, network packet analysis, color codes in web design (e.g., #FF5733), cryptographic hash values (MD5, SHA), binary file analysis, programming constants (0x prefix), and representing raw byte data in a readable format.
What is the difference between space-separated and continuous hex?
Continuous hex (e.g., 48656C6C6F) has no separators between byte values, making it compact. Space-separated hex (e.g., 48 65 6C 6C 6F) adds spaces between each byte, making it easier to read and count individual bytes. Both represent the same data, but the choice depends on readability requirements.
What does the 0x prefix mean?
The 0x prefix is a common convention in programming languages (C, C++, Java, Python, JavaScript) to indicate that a number is in hexadecimal format. For example, 0x48 means the hexadecimal value 48 (which is 72 in decimal). This tool supports encoding with 0x prefixes for programming convenience.
Can this tool handle non-ASCII characters like Chinese?
Yes, this tool converts all characters to their UTF-8 byte representation in hexadecimal. Non-ASCII characters like Chinese characters will be encoded as multiple hex bytes. For example, the Chinese character "中" is encoded as "E4B8AD" (3 bytes in UTF-8).
Is this hex encoder tool free?
Yes, it is completely free to use with no registration, sign-up, or limits. You can use it as many times as you need for personal, educational, or commercial projects.