English Letter Case Converter
大小写转换大写小写字母转换
Convert text to UPPERCASE or lowercase in one click, with mixed Chinese-English support and instant copy. Ideal for titles, data cleanup and copyediting, fully local.
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How to Use
- Paste your text into the editor
- Choose the processing option and run
- Copy the transformed text
- Text processing runs entirely locally; we never collect any text data
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FAQ
Which conversion modes are supported?
Full UPPERCASE and full lowercase; digits, punctuation and Chinese characters remain unchanged.
Does converting alter the original?
No, the input stays intact and results appear below for copying or clearing at any time.
Will my data be uploaded?
No, all conversions run locally in your browser.