NOPPAW

Sentence Case Converter

The Sentence Case Converter rebuilds normal-looking prose from messy input: everything is lowercased first, then the first letter of each sentence is capitalized. It is the quickest rescue for paragraphs pasted from all-caps documents, shouty emails and OCR output. Sentences are detected from full stops, question marks and exclamation marks.

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How to use Sentence Case Converter

  1. Type or paste your paragraph into the box.
  2. The sentence-cased version appears in the result box immediately.
  3. Re-capitalize names and acronyms by hand if they matter, then copy the result.

Supported behavior

  • Sentences ending in . ? or ! (including those followed by quotes or brackets) start a new capital.
  • Leading whitespace at the very start of the text is handled correctly.
  • Line breaks do not start a new sentence on their own — only sentence punctuation does.

Best for

  • Cleaning up all-caps documents and specifications.
  • Normalizing OCR or speech-to-text output.
  • Preparing body copy that was typed without a shift key.

Limits

  • Because everything is lowercased first, proper nouns (Jakarta, Monday), the pronoun 'I' mid-sentence start aside, and acronyms like NASA lose their capitals and need manual fixing.
  • Abbreviations such as 'e.g.' contain full stops, so the letter after them may be capitalized incorrectly.

Privacy notes

  • Everything runs on your device: the text you type never leaves your browser.
  • Your paragraphs never leave the device you paste them on.

Related tools

Case Converter Lowercase Converter Convert any text to quiet lowercase letters, live as you type. Case Converter Capitalized Case Converter Capitalize the first letter of every word in your text. Case Converter Convert Case See your text in every case style at once and copy the one you need. Case Converter Title Case Converter Put headlines and titles into proper headline-style title case.

Sentence Case Converter FAQ

Will it capitalize the word 'I'?

Only where 'I' starts a sentence. A mid-sentence 'i' stays lowercase after conversion, because everything is lowercased first — fix standalone 'i' with Find and Replace if needed.

What punctuation counts as a sentence end?

Full stops, question marks and exclamation marks, including runs like '...' or '?!' and punctuation followed by a closing quote or bracket.

Why did a word after 'e.g.' get capitalized?

The tool sees the full stop inside the abbreviation as a sentence boundary. It is a known trade-off of automatic sentence detection.