Case Converter

Free online case converter

A case converter changes the capitalisation of your text in one click. ProseTool's case converter transforms any text to UPPERCASE, lowercase, Title Case, Sentence case, or toggled case instantly — no retyping required. It is the fastest way to fix text that was typed with the wrong capitalisation.

We have all done it: written a heading in all caps, left Caps Lock on, or pasted text that arrived in the wrong format. Retyping it by hand is a waste of time. This tool rewrites the capitalisation for you while keeping every word exactly as it was.

How to use the case converter

1. Type or paste your text into the box above.
2. Click the case you want: UPPERCASE, lowercase, Title Case, Sentence case, or Toggle Case.
3. The text in the box updates immediately.
4. Click Copy text to take the result, or convert again to try another style.

The five case styles

• UPPERCASE — every letter becomes a capital. Great for headings and emphasis.
• lowercase — every letter becomes small. Useful for tags, usernames, and casual styling.
• Title Case — the first letter of each word is capitalised, ideal for titles and headlines.
• Sentence case — only the first letter of each sentence is capitalised, the natural style for prose.
• Toggle Case — swaps the case of every letter, perfect for undoing a stuck Caps Lock.

Benefits of a case converter

Converting case manually is slow and easy to get wrong, especially in long passages. A dedicated tool guarantees consistency: every sentence starts correctly, every title follows the same rule, and nothing is missed. Students, writers, marketers, and developers all reach for a case converter when reformatting headings, normalising data, or cleaning up pasted content.

Because everything happens in your browser, there is no limit on how much text you can convert and nothing you paste is ever uploaded. Convert a single heading or an entire document with the same single click.

Frequently asked questions

What is Title Case? +

Title Case capitalises the first letter of each major word, the way headlines and book titles are written, for example "The Lord Of The Rings". This tool capitalises the first letter of every word so you can fine-tune small words like "of" and "the" yourself.

What is Sentence case? +

Sentence case capitalises only the first letter of each sentence and leaves the rest lowercase, the way ordinary prose is written. It is ideal for fixing text that was typed in all caps.

What does Toggle Case do? +

Toggle Case swaps the case of every letter — uppercase becomes lowercase and lowercase becomes uppercase. It is handy for fixing text typed with Caps Lock left on by accident.

Will it change my text permanently? +

It only changes the text in the box on this page. Nothing is sent anywhere or saved. Use the Copy button to take the converted text with you, or refresh the page to start over.