All tools
Case Converter
Convert text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case and more.
The conversion runs entirely in your browser — nothing is uploaded.
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Case Converter — frequently asked questions
What is Title Case vs Capitalize Each Word?+
Capitalize Each Word capitalises every word. Title Case follows style rules — small words like 'and', 'the', 'of' stay lowercase unless they are first or last.
Does camelCase / snake_case strip punctuation?+
Yes — programmer cases remove spaces and punctuation and join the words, since that is how identifiers are written.
Can I undo a conversion?+
Your original text stays in the top box, so you can re-run a different case at any time.
你們會把我的檔案上傳到伺服器嗎？+
不會——這裡的每個工具都完全在你的裝置上處理檔案，不會向伺服器上傳任何內容。唯一的例外是 AI 工具，它們會把擷取的文字（而非檔案本身）傳送給 Claude 來完成工作。
有檔案大小限制嗎？+
我們沒有人為設下限制，但由於處理過程在你的瀏覽器中進行，非常大的檔案（超過 500MB 或 1000 頁）會受你裝置記憶體的限制，而非我們的限制。
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