Case reverser
Swap English letter case while preserving digits, punctuation, Chinese, and line breaks; Latin-1 letters are optional.
Runs in your browserEvery computation happens in your browser — your data never leaves this device.
Text
Result
English letter case has been swapped.
Enter text to convert
: 0 · : 0
What this tool does
- Swap case in identifiers or test text.
- Inspect variants for case-sensitive scenarios.
Example
Input
Hello World!
Output
hELLO wORLD!
Only ASCII English letters are swapped by default.
Frequently asked questions
Does it change Chinese?
No.
Can accented Latin letters be handled?
Enable Latin-1.
Does empty input throw?
No, it returns empty output.
Keywords：大小写反转英文转换case reverseswap case文本大小写Latin-1