The output is not what I expected.
Recheck the input, selected options and the limitation notes below; preserve the original before trying a destructive cleanup. Hexadecimal is a representation, not encryption or hashing.
String to Hex Converter
Encode text as UTF-8 bytes and display the result as readable hexadecimal pairs.
What this tool does
String to Hex encodes the input as UTF-8, then writes each byte as two uppercase hexadecimal digits separated by spaces. Unicode text, including Vietnamese, CJK and emoji, may use multiple bytes per character. Hexadecimal is a representation, not encryption or hashing.
Enter text and copy its UTF-8 hexadecimal byte sequence.
How to use it
Enter or paste the text to encode.
Review the uppercase, space-separated hexadecimal byte pairs.
Copy the bytes, or use Hex to String to decode them as UTF-8.
Key features
- UTF-8 encoding for Unicode text.
- Uppercase two-digit hexadecimal output for each byte.
- Clear byte boundaries through space-separated pairs.
Practical use cases
- Inspecting payload bytes during debugging.
- Documenting UTF-8 examples and test vectors.
- Creating compact hexadecimal fixtures from multilingual text.
Limitations and important notes
- Hexadecimal is a representation, not encryption or hashing.
- A single visible character may produce several bytes.
- The destination must decode the same UTF-8 byte sequence.
Troubleshooting
The page becomes slow with a large input or repeat count.
Reduce the input, split the operation into smaller batches and close other memory-heavy tabs. Keep an original copy before retrying.
The result changes after I paste it elsewhere.
Test the destination app, font and character encoding. Some apps normalize whitespace or render Unicode differently.
Frequently asked questions
How do I convert text to hex?
String to Hex encodes the input as UTF-8, then writes each byte as two uppercase hexadecimal digits separated by spaces. Unicode text, including Vietnamese, CJK and emoji, may use multiple bytes per character.
Are spaces required between bytes?
The encoder emits spaces for readability. The paired decoder accepts input with or without common separators.
Why does one emoji produce many hex pairs?
UTF-8 represents many Unicode characters with multiple bytes; each byte becomes one hex pair.
What are the limitations?
Hexadecimal is a representation, not encryption or hashing. A single visible character may produce several bytes. The destination must decode the same UTF-8 byte sequence.
Related tools
Use the tool
Enter text and copy its UTF-8 hexadecimal byte sequence.