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Case Converter

Fix sentence case and switch letter styles.

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Case style

Sentence case fixes standalone i → I, capitalizes after . ! ? … (including after closing quotes), and leaves abbreviations such as Mr., Dr., e.g., i.e. and U.S.A. alone. Words already in capitals are kept.

Result

live
I went to see dr. smith. He said...It's fine.

Highlighted words are the ones sentence case would change. Nothing is applied until you press “Apply to input”.

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WHAT YOU CAN DO

01 / FEATURES
[ SECURE ]

Sentence boundaries, not just dots

A dot only starts a new sentence when it is followed by whitespace, a closing quote or the end of the text. Ellipses (… or ...) always start a new sentence.

[ FAST ]

Abbreviation blacklist

Mr., Dr., e.g., i.e., U.S.A., a.m., p.m. and other common abbreviations do not trigger capitalization. Existing all-caps words are preserved.

[ LOCAL ]

Highlight-first preview

Changed characters are marked before anything is applied, so you stay in control of the edit.

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ABOUT CASE CONVERTER

02 / OVERVIEW

What it solves

Text pasted from chat apps, notes or old drafts often arrives with random capitalization. A naive “capitalize after every dot” rule breaks on Dr., e.g. and U.S.A., so the exceptions matter as much as the rule.

The remaining tabs are straight conversions: uppercase, lowercase, title case, alternating, inverse, camelCase, snake_case and kebab-case.

INPUT → OUTPUTEXAMPLE_001
i went to see dr. smith. he said...it's fine.

=> I went to see dr. smith. He said...It's fine.

“dr.” is an abbreviation, so the word after it is not capitalized; the ellipsis and the sentence-ending period are.

Common use cases

  • Abbreviation exceptions
  • Standalone i → I
  • Preview before applying
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SIMILAR TOOLS

03 / RELATED
COMPAREText Diff ↗COUNTWord Counter ↗SORTAlphabetize List ↗
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FREQUENTLY ASKED QUESTIONS

04 / FAQ
Why is the word after “Dr.” not capitalized?

Because “Dr.” is an abbreviation, not the end of a sentence. Treating it as a boundary would produce wrong names and titles.

Does it change words that are already uppercase?

No. All-caps abbreviations and emphasised words are left as they are.

Can I see what will change first?

Yes. Enable Preview changes in sentence case; the highlighted characters are then applied only when you press Apply to input.

Are hyphens and apostrophes handled in camelCase?

camelCase, snake_case and kebab-case use the site-wide word rule, so punctuation becomes a word separator and apostrophes stay inside a word.