Case Converter

Convert English text case: upper, lower, title, sentence, and invert.

🔐 Local processing

✅ Choose a mode, then click "Convert". Chinese and symbols stay unchanged.

ℹ️ Sentence case detects sentence boundaries after . ? !

About this tool

Fix caps lock mistakes or format headings for docs and code comments. Paste or type, pick a case style, copy the result.

What is Title Case?

Major words capitalized—useful for headlines and button labels.

Unicode text supported?

Yes. Conversion respects basic Unicode letter cases where applicable.