How to use the case converter
- Type or paste your text into the top box. It can be a single headline or several pages.
- Press the button for the style you want: UPPERCASE, lowercase, Title Case or Sentence case. The converted text appears in the Result box straight away.
- Check the result. If you want to apply another style on top of it, press Move result to input and convert again.
- Press Copy result to put it on your clipboard, or download it as a plain
.txtfile.
A simple case converter that respects your privacy
Everyone has pasted a paragraph into an email and noticed that it is written entirely in capital letters, or copied a list of names from a spreadsheet where everything is lower case. Retyping the text by hand is slow and error-prone. A case converter does the job in one click, and this one does it without sending your words anywhere. The conversion runs inside your browser, so it is safe for confidential drafts, customer lists, unpublished articles and anything else you would rather not paste into a stranger's website.
The page needs no account, adds no watermark and works offline once it has loaded. You can bookmark it or install it as an app from your browser menu and use it whenever you need it.
The four conversion styles explained
| Style | Example result | Typical use |
|---|---|---|
| UPPERCASE | THE QUICK BROWN FOX | Warnings, acronyms, labels, spreadsheet codes |
| lowercase | the quick brown fox | Email addresses, tags, URLs, cleaning up caps lock mistakes |
| Title Case | The Quick Brown Fox | Headlines, book and song titles, product names |
| Sentence case | The quick brown fox. It jumps. | Ordinary prose, captions, UI text, repairing shouted paragraphs |
UPPERCASE and lowercase
These are the simplest conversions. Every letter becomes a capital or a small letter, and digits, spaces and punctuation stay as they are. Uppercase is useful for notices, short labels and codes. Lowercase is the safest way to normalize text before comparing it, sorting it or storing it, because "Email", "EMAIL" and "email" become identical.
Title Case
Title Case capitalizes the first letter of each word and lowers the rest. It is a quick way to format a blog title, a presentation slide or a heading in a document. Apostrophes are handled sensibly: "don't" becomes "Don't", not "Don'T". Keep in mind that formal style guides differ. The Associated Press and Chicago styles keep articles, short prepositions and conjunctions such as "a", "of" and "and" in lower case unless they start or end the title, so you may want to adjust those words manually after converting.
Sentence case
Sentence case lowers the whole text and then capitalizes the first letter of the text, of every sentence that follows a period, question mark, exclamation mark or ellipsis, and of every new line. It is the best fix for a paragraph that was typed with caps lock on. Because everything else is lowered, proper nouns, product names and acronyms lose their capitals, so give the result a quick read and restore them.
Where a case converter helps in practice
- Writers and students: repair text copied from a PDF where headings arrive in capitals, or format headings consistently before submitting an essay.
- Marketers: standardize subject lines, product titles and ad headlines. Many email tests show that sentence case feels more personal, while Title Case can look more formal.
- Office workers: clean up customer names imported into a CRM or mailing list when some arrive in ALL CAPS and others in lower case.
- Developers and data analysts: lowercase keys, tags or email addresses before deduplicating them, or uppercase country and currency codes.
- Social media managers: adjust captions and hashtags quickly. Remember that screaming capitals read as shouting to most audiences, so use uppercase sparingly.
Tips for better results
Always read the output once. Automatic conversion cannot know that "iPhone" should keep its lower-case first letter or that "McDonald" has a capital in the middle. Title Case and Sentence case are the two options where hand-editing is most likely. If your text contains many such names, convert to lowercase first and capitalize the special cases yourself.
If you are working with a list, put each item on its own line. Sentence case treats every new line as the start of a sentence, which means each list item gets a leading capital. For very large lists it is faster to convert everything at once than to edit item by item.
When you want to count the result against a limit, paste it into our Word Counter, which also offers extra tools such as sorting lines and removing duplicates.
Language and special characters
The converter uses your browser's Unicode support. Accented Latin letters, Greek and Cyrillic convert correctly, and emoji, digits and punctuation are untouched. Some languages have special rules, and the English rules are used here. German ß becomes SS in upper case, and the Turkish dotted and dotless i follow the English mapping, which means "i" becomes "I". If you write Turkish text, use our Turkish version of this tool, which applies the correct İ and ı rules.
Private by design
Your text is processed only in your browser. It is not uploaded, logged or saved, there are no tracking cookies and no account is needed. When you close the tab the text is gone, so copy or download anything you want to keep.
Frequently asked questions
What is the difference between Title Case and Sentence case?
Title Case capitalizes the first letter of every word, as in "The Quick Brown Fox". Sentence case capitalizes only the first letter of each sentence, as in "The quick brown fox. It jumps." Headlines in US publications often use Title Case, while many UK and web style guides prefer Sentence case.
Does Title Case keep small words like "of" and "the" in lower case?
No. This converter capitalizes every word so the result is predictable. Style guides such as AP, APA and Chicago leave short articles, conjunctions and prepositions in lower case, so edit those by hand if your guide requires it.
Will Sentence case lower-case names and acronyms?
Yes. Sentence case first lower-cases the whole text and then capitalizes the first letter of each sentence and each new line. Names such as "London" or acronyms such as "NASA" are lowered too, so re-capitalize them afterwards.
Is my text uploaded to a server?
No. The conversion is performed by JavaScript in your own browser tab. Nothing is sent over the network, nothing is stored, and the text disappears when you close or reload the page.
Does the tool work with accented letters and other alphabets?
Yes. It uses the browser's built-in Unicode case mapping, so letters such as é, ñ, ü, ø and Greek or Cyrillic characters convert correctly. Scripts without upper and lower case, such as Chinese or Arabic, are left unchanged. A few special cases follow Unicode rules, for example the German ß becomes SS in upper case.
Is there a limit on how much text I can convert?
There is no fixed limit. Several hundred thousand characters convert instantly on a modern computer. Very large pastes of many megabytes may slow the page because the text box has to display everything.
What is the quickest way to fix text typed with caps lock on?
Paste it into the box and press lowercase to get everything in small letters, or Sentence case to also capitalize the start of each sentence. Then press Copy result and paste it back where you need it.
Can I use this for programming names like camelCase or snake_case?
This tool focuses on writing styles: uppercase, lowercase, title case and sentence case. For identifiers, convert words to lowercase here and then join them with underscores or capitals in your code editor, or use a dedicated developer tool.
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