Case Converter
Convert text case instantly. Paste or type below and select a conversion mode.
Text is processed in your browser and is not uploaded by the converter. The page itself is delivered over the internet.
How to Use the Case Converter
ConverteCaixa is the fastest and most secure case converter online. All processing happens locally in your browser, ensuring your text is never sent to external servers.
Conversion Modes
Sentence Case
Capitalizes only the first letter of each sentence. Ideal for narrative texts and paragraphs.
Example: "hello world. how are you? fine!" → "Hello world. How are you? Fine!"
lowercase
Converts all letters to lowercase. Useful for text normalization.
Example: "HELLO WORLD" → "hello world"
UPPERCASE
Converts all letters to uppercase. Useful for emphasis and headlines.
Example: "hello world" → "HELLO WORLD"
Capitalized Case
Capitalizes the first letter of every word. Ideal for proper names and simple titles.
Example: "hello world" → "Hello World"
Title Case
Capitalizes following title rules, where articles and prepositions remain lowercase. Useful for article titles, book titles, and academic papers.
Example: "the art of war" → "The Art of War"
Inverse Case
Inverts the case of each letter: uppercase becomes lowercase and vice versa.
Example: "Hello World" → "hELLO wORLD"
aLtErNaTiNg CaSe
Alternates between uppercase and lowercase letter by letter.
Example: "hello world" → "HeLlO wOrLd"
tOGGLE cASE
Toggles the case of each individual letter.
Example: "Hello World" → "hELLO wORLD"
Tips for Using the Converter
- Use
Ctrl+Zto undo andCtrl+Yto redo - Click "Compare" to see original and converted text side by side
- Download the result as a TXT file to use in other programs
- Your draft is automatically saved in the browser
Special Character Support
ConverteCaixa preserves accented characters, symbols, and Unicode characters. Line breaks, paragraphs, and spaces are maintained during conversion.
Capitalization Rules
Understanding when to use each case type is important for professional writing:
- Sentence case — Standard for body text and paragraphs
- Title case — Used in APA, MLA, Chicago, and AP styles (with slight variations)
- UPPERCASE — Reserved for acronyms, initialisms, and emphasis
- lowercase — Used for common nouns and after colons in some styles
Frequently Asked Questions
How do I change case in Microsoft Excel?
In Excel, use the following functions:
=UPPER(A1)— Converts to uppercase=LOWER(A1)— Converts to lowercase=PROPER(A1)— Converts to capitalized
How do I change case in Microsoft Word?
In Word, select the text and press Shift+F3 to toggle between uppercase, lowercase, and capitalized. For more options, use Format > Text > Change Case.
How do I change case in Google Sheets?
In Google Sheets, use the same functions as Excel:
=UPPER(A1)=LOWER(A1)=PROPER(A1)
What is the difference between sentence case and title case?
Sentence case capitalizes only the first letter of each sentence. Title case capitalizes the first letter of each significant word, keeping articles and prepositions lowercase.
How do I fix accidental Caps Lock text?
Paste your ALL CAPS text into the converter, select "lowercase" mode, and the text will be converted to lowercase. You can then use "Capitalized" or "Sentence" mode to fix the capitalization as needed.
Can I use ConverteCaixa for long texts?
Yes. ConverteCaixa is optimized for texts of any length, from a single word to entire documents. All processing is done locally, with no server-imposed size limits.