Sentence Case Converter
Turn inconsistent capitalization into readable sentence case while keeping punctuation and line breaks intact.
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About this tool
Sentence Case Converter — This converter lowercases ordinary letters, then capitalizes the first letter at the start of the text and after sentence-ending punctuation. It is useful for text copied from all caps, mixed-case notes, and drafts with inconsistent capitalization.
Processing happens in your browser. The original text stays available in the input tab so you can review the result and make manual corrections before copying it.
How to use it
- Paste or type the text you want to normalize.
- Select Sentence Case to create the corrected version.
- Review names, acronyms, and brand terms, then copy or download the result.
Example
HELLO WORLD. how ARE you?
Hello world. How are you?
Review proper nouns and abbreviations after automatic conversion.
Common uses
- Fix text typed with Caps Lock enabled.
- Normalize imported notes, captions, and emails.
- Prepare a clean draft before proofreading or publishing.
What to know
- Sentence boundaries are detected from punctuation, so unusual formatting can require manual adjustment.
- Automatic conversion cannot reliably identify every proper noun, product name, or acronym.
Privacy: The conversion runs locally in your browser. The text is not sent to an AI service or stored by FoundSchool.
Frequently Asked Questions
What does sentence case change?+
It makes most letters lowercase and capitalizes the first letter of each detected sentence.
Will it preserve names and acronyms?+
Not always. Proper names, abbreviations, and brand styling may need a quick manual review after conversion.
Does it work inside the Google Play apps?+
Yes. The stable language endpoints used by the published apps open this same modern converter in the app language.