Text Case Converter
Paste your text and convert it to UPPERCASE, lowercase, Title Case or Sentence case in one click. This free online case converter and text case changer online works as an uppercase converter, lowercase converter and sentence case converter, and also handles camelCase, PascalCase, snake_case and kebab-case for developers.
Conversions happen instantly in your browser. Your text is never uploaded or stored.
How to use the Case Converter
- Paste your textType or paste any text, from a single headline to a full document.
- Choose a caseClick Sentence case, lower case, UPPER CASE, Title Case or any developer format. The text converts instantly in place.
- Undo if neededChanged your mind? Undo restores the previous version, up to 30 steps back.
- Copy or downloadCopy the converted text to your clipboard or download it as a .txt file.
More than a simple uppercase to lowercase converter
Smart Title Case
Keeps short words like “a”, “of” and “the” lowercase unless they start or end the title, and capitalizes hyphenated words.
Proper Sentence case
Capitalizes the first letter of every sentence and the word “I”, and lowercases the rest.
Developer cases
camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and dot.case for variables, files and keys.
One-click conversion
No forms or submit buttons: choose a case and the text changes immediately.
Undo history
Step back through up to 30 previous versions if a conversion was not what you wanted.
Private and free
Runs locally with no sign-up, limits or watermarks.
A fast text case changer online
Need to capitalize text quickly? We have all done it: typed a paragraph with Caps Lock on, pasted a headline in the wrong style, or received a spreadsheet full of names in ALL CAPS. Retyping is slow and error-prone. The NS Tools Hub text case converter fixes capitalization in one click, so you can convert uppercase to lowercase, lowercase to uppercase, or any text into Title Case or Sentence case without touching the keyboard.
The case styles explained
- Sentence case — capitalizes only the first word of each sentence and proper uses of “I”. Ideal for body text, UI labels and many modern headlines.
- lower case — every letter small. Useful for email addresses, tags and styliztic branding.
- UPPER CASE — every letter capitalized. Best kept for short labels, acronyms and warnings.
- Title Case — capitalizes the main words of a title. Our title case converter follows the rules shared by AP style and Chicago style of leaving short articles, conjunctions and prepositions lowercase unless they begin or end the title.
- Capitalized Case — capitalizes the first letter of every word, including short ones.
- aLtErNaTiNg and InVeRsE — playful styles for memes and social media.
A camelCase converter and snake case converter for developers
Programmers need consistent naming. JavaScript variables use camelCase, classes use PascalCase, Python and database columns use snake_case, URLs and CSS classes use kebab-case, and environment variables use CONSTANT_CASE. Paste a phrase such as “user account id” and convert it to any of these formats instantly. The converter also splits existing camelCase words, so “getUserName” becomes “get_user_name” in snake_case.
Why text formatting matters in digital marketing
Consistent capitalization signals professionalism. Headlines in a consistent title or sentence case look cleaner in search results, email subject lines and ad copy. Avoiding long passages of all caps also improves readability and accessibility, because uppercase words lose their distinctive shapes and some screen readers spell them out letter by letter.
Frequently asked questions
How do I convert uppercase to lowercase?
Paste your text into the box and click “lower case”. Every letter becomes lowercase instantly. To fix text typed with Caps Lock on, Sentence case is usually the better choice.
What is the difference between Title Case and Capitalized Case?
Title Case follows style-guide rules and keeps short words like “and”, “of” and “the” lowercase unless they start or end the title. Capitalized Case capitalizes the first letter of every single word.
Which title case style does the converter use?
It follows the shared core of AP and Chicago style: major words are capitalized, while articles, coordinating conjunctions and short prepositions stay lowercase unless they are the first or last word or follow a colon.
Will Sentence case capitalize names?
No tool can reliably know every proper noun. Sentence case capitalizes the start of each sentence and the pronoun “I”; check names, brands and places afterwards.
Does it work with non-English text?
Yes. Upper, lower, sentence and title case use your browser's Unicode-aware rules, so accented letters and alphabets such as Greek and Cyrillic convert correctly.
How do I fix text typed with Caps Lock on?
Paste it in and click Sentence case. Everything is lowercased and the first letter of each sentence is capitalized. Our guide on fixing text typed with Caps Lock covers inverted text too.
How do I change text case in Excel?
Use the =UPPER(), =LOWER() and =PROPER() formulas, or paste a column into this converter. See how to change text case in Excel and Google Sheets.
Can I undo a conversion?
Yes. The Undo button steps back through up to 30 earlier versions of your text.
Is my text saved anywhere?
No. All conversions happen locally in your browser and nothing is uploaded.
Capitalization & text formatting guides
20 practical guides written to help you get more out of the case converter.
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