Use this free online case converter to change uppercase to lowercase, convert lowercase to uppercase, capitalize words, or switch to sentence case. Paste your text, choose a format, and copy the result instantly.
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CONVERT CASE
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How it works
Choose the supported file from your device.
Use the available settings for the result you need.
Save the completed file directly to your device.
Type or paste your text into the editor. Select UPPERCASE, lowercase, Sentence case, Capitalize Words, Invert Case, or Alternating Case. Review the converted text, then use Copy Text to save it. Undo restores the previous version, while Clear Text empties the editor.
Change text capitalization without retyping. Convert capital letters to lowercase, make text uppercase, capitalize words, and experiment with alternative letter cases while preserving spaces, line breaks, and punctuation.
Text case conversion runs locally in your browser. The text you enter is not uploaded to Nimzoa's application servers for conversion. Website analytics are separate from your text content.
No. Conversions take place locally in your browser. This tool does not upload or save your text.
Use uppercase, lowercase, sentence case, capitalized words, inverse case, or alternating case.
No. Case conversions preserve whitespace, punctuation, and numbers.
Yes. Undo restores the text from immediately before your most recent conversion.
Paste your text into Nimzoa's Case Converter and select lowercase. The tool changes capital letters to small letters while preserving spaces, numbers, and punctuation. Review the result and click Copy Text.
Enter or paste your text, then select UPPERCASE. The converter changes supported lowercase letters into capital letters without requiring you to retype the text. Copy the result when finished.
Not exactly. Capitalize Words makes the first letter of each word uppercase, while editorial title case may follow special capitalization rules for short words. Nimzoa offers Capitalize Words, so review titles manually if you need a specific style guide.
Need to change capital letters to lowercase or turn a sentence into uppercase without typing everything again? Nimzoa's free online case converter helps you change text capitalization in seconds.
Paste or type your text into the editor above, then choose from six available formats: UPPERCASE, lowercase, Sentence case, Capitalize Words, Invert Case and Alternating Case.
The tool processes text in your browser and lets you copy the converted result without installing software or creating an account.
Changing text capitalization takes just a few steps.
Enter your text into the editor. You can paste a sentence, paragraph, heading, or longer passage.
Select the format that matches your needs. For example, choose UPPERCASE to make letters capital or lowercase to convert capital letters into small letters.
The tool updates the text using your selected conversion. Check names, abbreviations, and other words that may require special capitalization.
Select Copy Text to use the result elsewhere. You can also undo a conversion or clear the editor to start again.
The editor supports up to 200,000 characters, as displayed in the interface.
An uppercase converter changes lowercase letters into capital letters.
For example:
Before: welcome to nimzoa
After: WELCOME TO NIMZOA
This is useful when preparing labels, headings, short notices, or text that must appear in capital letters.
Paste the lowercase text into the editor.
Select UPPERCASE.
Review the result.
Copy the capitalized text.
You don't need to retype each word or turn on Caps Lock.
Uppercase conversion changes letter case; it does not automatically correct spelling or grammar.
A lowercase converter changes uppercase letters into lowercase.
For example:
Before: PLEASE SEND THE DOCUMENT
After: please send the document
This is useful when text has been typed with Caps Lock enabled or copied from a source that uses all capital letters.
Paste the capitalized text.
Select lowercase.
Review the converted result.
Copy the text.
This can save time when editing long passages containing unnecessary capital letters.
Sentence case generally uses a capital letter at the beginning of a sentence while keeping most other letters lowercase.
For example:
Before: WELCOME TO NIMZOA. THIS TOOL CHANGES TEXT CASE.
Expected sentence-case style: Welcome to nimzoa. This tool changes text case.
Sentence case is commonly used in paragraphs, messages, descriptions, and other everyday writing.
However, automatic case conversion cannot always recognize proper names, brands, or abbreviations. Review the output and restore any capitalization that should remain.
For example, a brand name such as Nimzoa may need manual correction if a conversion changes it to nimzoa.
The Capitalize Words option changes text so that words begin with capital letters.
For example:
Before: free online text case converter
After: Free Online Text Case Converter
This can be useful for labels, simple headings, names, and short titles.
Capitalize Words and editorial title case are not always identical.
Capitalize Words generally capitalizes each word.
Editorial title case follows a style guide that may leave certain articles, conjunctions, or prepositions lowercase.
For example:
Capitalize Words: The Guide To Online Writing
Possible editorial title case: The Guide to Online Writing
Nimzoa currently provides a Capitalize Words option. It should not be treated as a dedicated APA, AP, or Chicago style title capitalization checker.
Invert Case reverses the capitalization of letters.
Lowercase letters become uppercase, while uppercase letters become lowercase.
For example:
Before: Hello Nimzoa
After: hELLO nIMZOA
This option can be useful for experimenting with text styles or reversing an existing capitalization pattern.
Invert Case does not change the meaning of the words, although it may make the text less readable.
Alternating Case creates a pattern that switches between uppercase and lowercase letters.
For example, an alternating-case result might look like:
hElLo WoRlD
The exact starting case and how the pattern continues across spaces depend on the tool's conversion rules.
Alternating case is mainly used for informal, playful, or decorative text. It is generally not suitable for professional documents or accessibility-sensitive content.
The table below illustrates the six conversion styles.
Conversion | Example |
|---|---|
UPPERCASE | HELLO WORLD |
lowercase | hello world |
Sentence case | Hello world |
Capitalize Words | Hello World |
Invert Case | hELLO wORLD |
Alternating Case | hElLo WoRlD |
These examples show typical results. The exact output can depend on the input text and the tool's case-handling rules.
Uppercase letters are capital letters, such as A, B, and C.
Lowercase letters are small letters, such as a, b, and c.
Letter Type | Example | Common Use |
|---|---|---|
Uppercase | ABC | Initials, labels, emphasis |
Lowercase | abc | Everyday writing |
Sentence case | Hello world. | Sentences and paragraphs |
Capitalized words | Hello World | Headings and labels |
Correct capitalization improves readability and helps communicate names, sentence boundaries, and writing conventions.
A case converter changes the presentation of letters but does not decide whether the writing follows a particular grammar or editorial style guide.
Convert an entire passage from uppercase to lowercase instead of retyping it.
Use Capitalize Words or another case option as a starting point, then adjust the capitalization to your preferred writing style.
Make capitalization more consistent in notes, reports, forms, and drafts.
Convert text into a consistent style before reviewing brand-specific capitalization.
Change the letter case of content copied from spreadsheets, emails, websites, or other documents.
Use Invert Case or Alternating Case when creating informal or decorative text.
The purpose of case conversion is to change letter capitalization rather than rewrite the text.
For example:
Before: Hello, World! 123
After uppercase: HELLO, WORLD! 123
The comma, exclamation mark, numbers, and spacing remain in place.
Nimzoa's current tool is designed to preserve spaces, line breaks, and punctuation while changing letter case.
However, language-specific characters and unusual Unicode text may behave differently from basic English letters. Review important text after conversion.
Automatic conversion may change the capitalization of names, companies, and places.
Terms such as PDF, HTML, API, and URL may need to remain uppercase after sentence-case conversion.
Long passages written entirely in uppercase can be harder to read than normally capitalized text.
Use lowercase for text that must contain small letters, UPPERCASE for capital-letter requirements, and Sentence case for ordinary prose.
A case converter is a formatting tool, not a spelling checker, grammar checker or professional copy editor.
Nimzoa's Case Converter processes the text you enter locally in your browser.
The content is not uploaded to Nimzoa's application servers for case conversion.
You can paste text, select a format, and copy the result without creating an account.
The interface also includes word and character counts, Undo and Clear Text controls.
Use the Case Converter above to change capital letters to lowercase, convert lowercase to uppercase, apply sentence case, capitalize words, or experiment with invert and alternating case.
For related writing tasks, explore Nimzoa's Word & Character Counter and Lorem Ipsum Generator.