Free Online Case Converter
Switch any text between UPPERCASE, lowercase, Title Case, and Sentence case with one click. Writers use it to fix headlines, normalize data imports, and rescue paragraphs typed with Caps Lock on.
How to use the Case Converter
- Paste your text into the input field.
- Click the case button you need: uppercase, lowercase, Title Case, or Sentence case.
- Review the converted result in the output box.
- Copy the text with one click or clear the boxes to start over.
When the Case Converter is useful
- Fixing accidentally capitalized paragraphs from a stuck Caps Lock key.
- Formatting article headlines and book titles in Title Case.
- Normalizing imported data fields that arrive in inconsistent casing.
- Preparing citation text or legal references that require specific capitalization.
How the Case Converter works
Title Case capitalizes the first letter of principal words while leaving short articles and prepositions lowercase, following common editorial style. Sentence case capitalizes only the first letter of each sentence and proper nouns you have already capitalized. Every transformation runs client-side in JavaScript, which means confidential copy, client names, and internal documents can be pasted without being transmitted to any server.
Limits to keep in mind
The tool does not detect proper nouns on its own, so names inside lowercase text may need manual re-capitalization after conversion.
Frequently asked questions
Will Title Case keep small words lowercase?
Yes, short words like articles and prepositions stay lowercase unless they start the title.
Is there a length limit?
No fixed limit; very large texts depend on your device memory and browser speed.
Does the converter save my text?
No, nothing is stored or sent anywhere; conversion happens locally in your browser.
Last reviewed: October 2026.