Someone left Caps Lock on, a spreadsheet export came out in all capitals, or a headline needs to follow a consistent style. Retyping is slow and error-prone. This case converter changes the letter case of any text in one click and leaves everything else, including punctuation, numbers and line breaks, exactly where it was.
A Language rules option makes it handle the letter i correctly. English rules are the default, so "this is it" becomes "THIS IS IT". Switch to Turkish and the dotted and dotless i are kept apart, so "istanbul" becomes "İSTANBUL", something most online converters get wrong. Punctuation, numbers and line breaks never change.
How to use: Case Converter: Uppercase, Lowercase, Title and Sentence Case
- Open the Conversion menu and choose UPPERCASE, lowercase, Title Case or Sentence case.
- Leave Language rules on English and other languages, or pick Turkish for Turkish text.
- Type or paste your text into the Your text box, or click Load sample to try it first.
- Click Convert to see the converted text in the Result panel.
- Click Copy to put the result on your clipboard, or Download to save it as a text file.
Example: "WELCOME TO OUR NEW STORE" in Sentence case becomes "Welcome to our new store".
The four conversion modes
Each mode converts the whole text at once.
- UPPERCASE: turns every letter into a capital, useful for labels, warnings and short headings.
- lowercase: turns every letter into a small letter, handy for cleaning up shouted text or preparing data.
- Title Case: capitalizes the first letter of every word and lowercases the rest, including small words like "and" or "of".
- Sentence case: lowercases everything, then capitalizes the first letter of the text and the first letter after a period, question mark or exclamation point followed by a space.
Language rules: English by default, Turkish when you need it
Most languages have one letter i, but Turkish has two: dotted i/İ and dotless ı/I. The Language rules option lets you choose. With English and other languages, the default, i and I map to each other as usual: "I LIKE IT" becomes "i like it".
Choose Turkish (i → İ, ı → I) for Turkish text, and "istanbul" becomes "İSTANBUL" while "IŞIK" becomes "ışık". Generic converters usually produce "ISTANBUL" and "işik", which look wrong to Turkish readers. For mixed text, pick the rules of the language that matters most, then check the few words from the other language.
Title Case and Sentence case are simple, rule-based styles
Both modes lowercase the entire text before capitalizing, so acronyms and proper nouns lose their capitals. "NASA launches in Florida" in Sentence case becomes "Nasa launches in florida". Title Case here is the simple "capitalize every word" style; it does not follow AP or Chicago rules that keep short words like "a", "the" or "of" lowercase.
Sentence case starts a new sentence only after a period, question mark or exclamation point followed by a space, so a bare line break does not trigger a capital, while "e.g. this" does.
Case converter vs. Word, Google Docs and Excel
Microsoft Word offers Change Case (Shift+F3 cycles through options), Google Docs has Format > Text > Capitalization, and Excel uses formulas like UPPER, LOWER and PROPER. They work, but only inside that app. This tool is quicker when you are in a CMS, an email or a form: paste, convert, copy.
Frequently asked questions
What does the Language rules option do?
It decides how the letter i is converted. English and other languages, the default, uses standard rules: i becomes I and I becomes i. Turkish uses Turkish rules, where i becomes İ (dotted capital) and I becomes ı (dotless). Pick Turkish only for Turkish text; for English, French, German or Spanish, keep the default.
Will acronyms like NASA or SEO keep their capitals?
Only in UPPERCASE mode. Title Case and Sentence case first lowercase the whole text and then capitalize the first letter of each word or sentence, so "SEO" becomes "Seo" and "NASA" becomes "Nasa". After converting, search for your acronyms and brand names and restore their capitals by hand. It takes a few seconds and keeps the rest of the formatting consistent.
Does Title Case follow AP or Chicago style?
No. This tool uses the simple style that capitalizes the first letter of every word, including articles, conjunctions and short prepositions. Style guides such as AP or Chicago keep words like "a", "and", "of" or "the" lowercase in most positions. If you follow one of those guides, convert first and then lowercase the small words manually.
Does the converter change punctuation or line breaks?
No. Only letters are changed. Spaces, line breaks, numbers, punctuation and emoji stay exactly as they were, so you can convert a whole list or a multi-paragraph text and paste it straight back. The tool accepts up to 1 MiB of text.
Is my text sent to a server?
No. The conversion runs in your browser with JavaScript, and your text never leaves your device. You can safely convert drafts, internal documents or customer data. When you close or clear the page, the text is gone; nothing is stored on our side.