Case Converter
Change text case instantly — uppercase, lowercase, title, sentence and more.
How to use case converter
- Type or paste your text into the input box.
- Choose a case mode from the dropdown — the output converts live as you type.
- Check the converted text in the output box.
- Click Copy output to put the result on your clipboard.
Examples
Fix a caps-lock accident
A sentence typed with caps lock on becomes readable lowercase in one step.
Title-case a blog heading
Short words like "of" and "the" stay lowercase mid-heading, following common editorial style.
Sentence-case an ALL-CAPS contract excerpt
Legal text is often drafted in UPPERCASE; sentence case restores readability while capitalizing each new sentence.
What is Case?
Case Converter changes the capitalization of any piece of text in one pass. It covers the six modes people actually reach for: UPPERCASE for emphasis and legal headings, lowercase for urls and email addresses, Title Case for blog post headings and presentation slides, Sentence case for paragraphs typed in anger, plus alternating and inverse case for memes, sarcasm and word puzzles.
Writers use it to clean up drafts pasted from documents with inconsistent formatting. Developers use it to normalize constants, keys and CSS class names, and to turn a snake_case database column into a readable Title Case heading for a report. Lawyers and paralegals rely on UPPERCASE for defined terms in contracts. And anyone who has discovered the caps lock key was on halfway through a sentence knows the value of one-click repair.
Pick a mode and the output updates as you type — no button to press and no page reload. Title case follows the common editorial convention of keeping short words like "and", "of" and "the" lowercase in the middle of a heading. Everything runs in your browser; your text never leaves the page, so you can safely paste confidential drafts.
Frequently asked questions
What is the difference between title case and sentence case?
Title case capitalizes every major word in a heading while keeping short words like "and", "of" and "the" lowercase in the middle. Sentence case capitalizes only the first word of each sentence, like this answer.
What are alternating and inverse case used for?
Alternating case (aLtErNaTiNg cAsE) is the classic mock-sarcasm style popular in memes, while inverse case flips every letter — a fast way to undo text that was typed with caps lock on.
Does the case converter work with accented or non-English characters?
Uppercase, lowercase and sentence case use standard Unicode case mappings, so accented letters like é or ü convert correctly. Alternating and inverse case toggle A–Z letters only, matching the classic meme styles.
Should headings be snake_case or title case?
snake_case is for machines — variables, file names and urls. Headings for humans should be title case or sentence case. If a report generator hands you snake_case column names, paste them here to get readable headings.
Is my text uploaded anywhere?
No. Conversion runs entirely in your browser with JavaScript. You can disconnect from the internet after the page loads and every mode still works.