How to use the Case Converter
Step 1: Type or paste your text into the input box.
Step 2: Choose UPPERCASE, lowercase, Title Case or Sentence case. The result appears straight away.
Step 3: For Title Case, decide whether small words such as a, the and of should stay lowercase.
Step 4: Press Copy result to copy the converted text.
Step 5: Press Clear input to start again with new text.
Features and benefits
Four common styles
Uppercase, lowercase, title case and sentence case cover most everyday needs.
Smart title case
Small words like of, the and and stay lowercase unless they begin or end a line. Switch that off to capitalise every word.
Sentence case that makes sense
Capitalises the start of each sentence and line and turns a lone i into I.
Non-destructive
Your original text stays in the input box, so you can try each style and compare.
Private
Nothing you type is stored or sent anywhere.
What each case style does
Uppercase turns every letter into a capital, and lowercase turns every letter into a small letter. Title case capitalises the first letter of the important words, as in a book or article title. Sentence case capitalises only the first letter of each sentence, which is how normal prose is written.
How the title case rules work
Style guides disagree on details, so this tool uses a simple, widely accepted approach: short words such as a, an, and, as, at, but, by, for, in, of, on, or, the and to stay lowercase unless they are the first or last word of a line. Hyphenated words are treated part by part, so state-of-the-art becomes State-of-the-Art. If your style guide wants every word capitalised, untick the small-words option.
Things a converter cannot know
The tool first lowercases your text and then capitalises it, so acronyms and brand names with unusual capitals, such as NASA, iPhone or McDonald, will need a quick manual fix after conversion. Language-specific rules, such as the Turkish dotted and dotless i, are not applied. Always read the result before you publish it.
Example use cases
Headlines and titles
Format blog titles, email subjects and slide headings consistently.
Fixing Caps Lock mistakes
Convert a block of capitals to sentence case instead of retyping it.
Tidying data
Standardise names, product titles or list entries copied from a spreadsheet.
Social posts and captions
Quickly emphasise a short phrase in uppercase or tone it down in lowercase.
Frequently asked questions
What is the difference between title case and sentence case?
Title case capitalises the main words of a title, like This Is a Title. Sentence case capitalises only the first word and proper nouns, like This is a sentence.
Does it work with other languages?
Yes for scripts that have upper and lower case, such as accented Latin, Greek and Cyrillic. Scripts without case, such as Chinese or Hindi, are left unchanged.
Why did NASA turn into Nasa in title case?
The tool lowercases text before capitalising it, so acronyms lose their capitals. Edit them by hand after converting.
Can I undo a conversion?
Your original text stays in the input box. Choose a different style, or edit the input, to change the result.
Is my text uploaded?
No. The conversion happens in your browser and nothing is stored.
Related tools
Useful guides
Last updated 7 November 2026.