Sentence Case Converter
Convert any text into proper sentence case with a single paste. This free tool capitalizes the first letter of each sentence while keeping everything else lowercase. It recognizes periods, exclamation marks, and question marks as sentence boundaries, so your text gets properly formatted no matter how many sentences it contains. Sentence case is the standard capitalization style for body text, emails, social media posts, and everyday writing. Whether you are cleaning up text copied from an all-caps document or standardizing inconsistent capitalization across a draft, this tool handles it instantly. For formal headings that need each major word capitalized, use the Title Case Converter instead. If you want all caps, switch to the Uppercase Converter. All processing runs locally in your browser for complete privacy.
How to Use This Tool
- Type or paste your text into the input area.
- The sentence case output appears in the output area below. The text is first converted to all lowercase, then the first letter after each sentence-ending punctuation mark is capitalized.
- Review the result and manually adjust any proper nouns that should remain capitalized.
- Click Copy Output to copy the sentence-cased text to your clipboard.
- Use Clear to reset both fields and start over.
Examples
All caps to sentence case
Input
THIS IS A TEST. IT WORKS GREAT!
Output
This is a test. It works great!
Multiple sentence endings
Input
hello world. how are you? i am fine! great to hear.
Output
Hello world. How are you? I am fine! Great to hear.
What This Tool Is Useful For
- Cleaning up text pasted from PDFs, images, or all-caps documents into readable sentence case.
- Standardizing capitalization across paragraphs with inconsistent formatting.
- Formatting social media posts, comments, and messages with proper capitalization.
- Preparing body text for articles, blog posts, and email newsletters.
- Converting title-cased or uppercase headings back to sentence case for body text use.
Frequently Asked Questions
- What is sentence case?
- Sentence case capitalizes only the first letter of each sentence and leaves all other letters lowercase. It is the standard style for body text in most writing contexts.
- Which punctuation triggers a new sentence?
- Periods (.), exclamation marks (!), and question marks (?) are recognized as sentence-ending punctuation. The first letter following any of these is capitalized.
- Will proper nouns stay capitalized?
- The tool converts everything to lowercase first, then capitalizes sentence beginnings. Proper nouns like names and places will need to be manually corrected after conversion.
- Is my text private?
- Yes. All processing happens locally in your browser using JavaScript. No text is transmitted to any server.
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