Uppercase to Lowercase Converter
Paste any text and instantly convert it to lowercase, UPPERCASE, Title Case, Sentence case, or camelCase. Works entirely in your browser — nothing is sent to any server.
Input text
0 chars · 0 words
Output
Copied!
How to use the converter
Type or paste your text into the input box above. The tool converts it instantly — no button press needed. Choose your desired case from the buttons at the top, then copy the result or download it as a text file.
- lowercase — converts every letter to lower case (e.g. hello world)
- UPPERCASE — converts every letter to upper case (e.g. HELLO WORLD)
- Title Case — capitalizes the first letter of each major word (e.g. Hello World)
- Sentence case — capitalizes only the first letter of each sentence
- camelCase — removes spaces, first word lower, rest capitalised (e.g. helloWorld)
- PascalCase — like camelCase but first word also capitalised (e.g. HelloWorld)
- snake_case — replaces spaces with underscores, all lowercase (e.g. hello_world)
- kebab-case — replaces spaces with hyphens, all lowercase (e.g. hello-world)
When would you use a text case converter?
There are many situations where quickly changing the case of text saves time:
- You accidentally typed a long email or document with Caps Lock on and need to fix it without retyping.
- You are copying headings or titles from a source that used all caps and need them in title case for your article.
- You are a developer who needs to format variable names in camelCase, snake_case, or kebab-case consistently.
- You are writing SEO meta titles or headings and want to apply title case formatting quickly across multiple entries.
- You received a spreadsheet in all-uppercase and need it normalised to sentence case before publishing.
How the conversion works
All conversion happens directly in your browser using JavaScript. No text is ever uploaded to a server, stored, or logged. The tool processes your input character by character:
- Lowercase / Uppercase: Uses the built-in
toLowerCase()andtoUpperCase()string methods, which correctly handle Unicode characters including accented letters. - Title Case: Capitalises the first letter of each word. Short conjunctions and prepositions (a, an, the, in, of, on…) are kept lowercase unless they start the string.
- Sentence case: Splits text by sentence-ending punctuation and capitalises the first letter of each new sentence.
- Code cases (camel, Pascal, snake, kebab): Strips punctuation, splits on spaces and existing casing boundaries, then reassembles in the target format.
Frequently asked questions
How do I convert uppercase to lowercase online?
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Paste your text into the box above and select the lowercase button. The tool instantly converts all capital letters to small letters. You can then copy the result with the Copy button.
Is my text saved or sent anywhere?
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No. The conversion runs entirely in your browser. Nothing you type is sent to any server or stored in any database. You can even use the tool offline once the page has loaded.
Does it work with accented characters and other languages?
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Yes. The converter uses JavaScript's native Unicode-aware case methods, so accented letters like é, ñ, ü, and characters from other Latin-script languages convert correctly.
What is the difference between Title Case and Sentence case?
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Title Case capitalises the first letter of every major word — used in headlines and article titles. Sentence case only capitalises the first word of each sentence — the standard format for body text and most social media posts.
Can I use this for programming variable names?
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Yes. The camelCase, PascalCase, snake_case, and kebab-case options are designed exactly for that. Paste a plain English phrase and get back a correctly formatted variable or CSS class name instantly.
Is there a character limit?
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No hard limit. Because processing happens in your browser, very large texts (hundreds of thousands of characters) may take a moment on slower devices, but the tool handles typical documents and articles instantly.
How do I change uppercase to lowercase in Word or Google Docs?
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In Microsoft Word, select the text and press Shift + F3 to cycle between cases. In Google Docs, go to Format → Text → Capitalization. Alternatively, paste your text into this tool, convert it, and paste it back — especially useful if you need a case format that Word doesn't support natively, like snake_case.