Sentence Case Converter

Convert text to sentence case online. Fix ALL CAPS, capitalise the first letter of each sentence, keep acronyms and brand names like iPhone, and fix the lone "i".

  • Free, no sign-up
  • Runs in your browser
  • Your data stays private

How to use the Sentence Case Converter

  1. Paste text that is all caps, all lowercase or inconsistent.
  2. Add words that must keep their exact spelling, such as iPhone or NASA.
  3. Copy the corrected text.

Why use this Sentence Case Converter

  • Protected wordsList brand names and acronyms once and they are always written exactly as you typed them.
  • Acronym optionKeep existing ALL-CAPS acronyms, or switch it off to fix fully shouted text.
  • New line handlingCapitalise after full stops, question marks, exclamation marks, colons or every new line.
  • Pronoun fixA standalone "i" becomes "I" automatically.

Frequently asked questions

How do I convert ALL CAPS to sentence case?

Paste the text with "Lowercase everything else first" ticked and "Keep ALL-CAPS acronyms" off. Each sentence then starts with a capital letter.

How can I keep names like iPhone capitalised correctly?

Add them to the "Always write these words exactly" box, separated by commas.

Does it handle bullet lists?

Yes. Capitalisation is applied after bullet markers when "Capitalise every new line" is on.

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