Sentence Case Converter

Reformat ALL CAPS or messy text into clean sentence case. Each sentence starts with one capital — the rest is lowercase.

Convert text to sentence case: only the first letter of each sentence is capitalized. Free online tool. The text is lowercased first, then the first letter.

Sentence Case Converter examples

InputOutput
THIS IS A SENTENCE. AND ANOTHER ONE!This is a sentence. And another one!

How the sentence case converter works

  1. The whole text is lowercased first.
  2. The first letter of the text and the first letter after every . ! or ? is capitalised.
  3. Copy the readable, sentence-cased output.

Rules and edge cases

  • The text is lowercased first, then the first letter of the text and the first letter after every . ! or ? is capitalised.
  • A capital is placed after the sentence-ending punctuation even when it is followed by a quote or a bracket.
  • Proper nouns, names and the pronoun I are not restored automatically — a converter cannot know which words are names.
  • Title Case capitalises every important word; sentence case produces normal running prose.

Frequently asked questions

Will my names and brands stay capitalised?

No. Sentence case lowercases everything before rebuilding sentence starts, so proper nouns such as London or Nike need a quick manual pass afterwards.

How are abbreviations like e.g. handled?

A period inside an abbreviation looks like a sentence end, so the following letter is capitalised. Check text with e.g., i.e. and Dr. after converting.