Text UtilitiesText ConvertersFree Tool
Sentence Case Converter
Lowercase your text and capitalize the first letter of every sentence, detected by periods, exclamation points, and question marks.
How to Use Sentence Case Converter
- 1Paste your text
- 2View the sentence-case result instantly
- 3Copy it to your clipboard
Frequently Asked Questions
Every sentence — the tool detects sentence boundaries at periods, exclamation points, and question marks (followed by whitespace) and capitalizes the first letter after each one, not just the very start of the text.
They're lowercased along with everything else — this tool applies pure mechanical sentence-boundary capitalization and doesn't recognize proper nouns, acronyms, or the pronoun "I", so you may need to manually fix those afterward.
A period, exclamation mark, or question mark followed by one or more spaces and then a letter — it's a mechanical pattern match, not real sentence understanding, so abbreviations like "e.g." or "etc." followed by a space and a word can get treated as a sentence end and over-capitalized. Decimal numbers like "3.5" are safe since there's no space after the period.
No — the conversion happens entirely in your browser.
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