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Celveri

Text Case Converter

Switch text between sentence case, title case, upper and lower case, or the identifier styles used in code.

Convert the case of your text

Convert to
Or an identifier style
Title style

Lowercases every preposition, however long. Used by most book and academic publishers.

Nothing to convert yet.

Your text stays in this tab. It is not uploaded or saved.

How to use it

  1. Type or paste your text into the first box.
  2. Choose a case. Each option shows an example, so you can see the difference before picking.
  3. Copy the result, or select Use result as input to run another conversion on it.

Which case do you want?

  • Sentence case — ordinary prose. One capital at the start of each sentence.
  • Title Case — headlines and titles, with the small words left lowercase. Choose Chicago or AP.
  • Capitalise Each Word — every word, including of and the. Useful for labels, wrong for titles.
  • UPPER and lower — straightforward, and the only two that cannot lose information about which words were proper nouns.
  • Identifier styles — camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE, for code and for filenames and URL slugs.

What it cannot do

  • Recognise proper nouns. Sentence case will lowercase names and places. Check the result before using it.
  • Apply a non-English style guide. The title case word lists are English.
  • Handle Turkish dotted and dotless i. Casing uses the locale-independent Unicode mappings, deliberately, so the result does not change with your browser’s language setting.
  • Keep punctuation in identifier styles. Identifiers cannot contain it, so it is dropped.

Counting instead of converting?

The Word Counter gives words, sentences and reading time, and the Character Counter checks text against a limit.

Common questions

What is the difference between title case and capitalising every word?
Title case leaves the small words alone: The Lord of the Rings. Capitalising every word does not: The Lord Of The Rings. Titles of books, articles and headlines use the first; the second is occasionally wanted for labels and menus, so both are offered.
Why are there two title styles?
Because the style guides genuinely disagree, and the difference is visible. Chicago lowercases every preposition however long, giving Gone with the Wind. AP capitalises any word of four letters or more, giving Gone With the Wind. Book and academic publishers tend to follow Chicago; newsrooms tend to follow AP. Pick whichever your reader expects.
Will sentence case ruin my proper nouns?
It can, and this is the one thing to watch. Sentence case lowercases everything except the start of each sentence, and no tool can reliably tell Bill the person from bill the invoice. Names, places and brands will need fixing by hand afterwards. Leaving Leave words already in capitals alone ticked protects acronyms such as NASA and HTML, and the standalone pronoun I is always kept capitalised.
What do the identifier styles do?
They convert a phrase into the naming conventions used in code: camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE. They also convert between each other, so pasting userFirstName and choosing snake_case gives user_first_name. Runs of capitals are kept together, so HTTPResponseCode becomes http_response_code rather than splitting every letter. Punctuation is dropped, because identifiers cannot contain it.
Does it handle accented and non-English text?
Upper and lower casing use the standard Unicode mappings, so café becomes CAFÉ correctly. Two caveats: the title case word lists are English, so they will not lowercase the small words of another language; and Turkish dotted and dotless i are not special-cased, so istanbul becomes ISTANBUL rather than İSTANBUL.
Is my text sent anywhere?
No. The conversion happens in this page, in your browser. Celveri has no upload endpoint and no database, and nothing you type is saved, not even in your browser’s own storage.

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