Sentence Case Converter

Convert text to sentence case — capitalize the first letter of each sentence. Free online tool for proper sentence capitalization.

Input

0 characters0 words

Sentence Case Output

Output will appear here...

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The sentence case converter capitalizes the first letter of every sentence while converting the rest of your text to lowercase. It follows standard English capitalization rules for clean, readable text.

This tool identifies sentence boundaries by looking for periods, exclamation marks, and question marks followed by whitespace. It's perfect for fixing text that was typed in all caps, normalizing text from various sources, or cleaning up copy-pasted content.

Processing is instant and happens entirely in your browser — no data is transmitted to any server.

How to Use Sentence Case Converter

1Paste or type your text into the input area above.
2The text is automatically converted to sentence case in real time.
3Review the output — you may want to re-capitalize proper nouns manually.
4Click the Copy button to copy the result to your clipboard.

Frequently Asked Questions

What is sentence case?▾

Sentence case capitalizes the first letter of each sentence and lowercases the remaining letters. It follows the standard writing convention for most prose and body text in English.

How does the tool detect sentences?▾

The tool identifies sentence endings by looking for period (.), exclamation mark (!), or question mark (?) characters followed by whitespace. The first character after a sentence boundary is capitalized.

Will this tool preserve proper nouns and acronyms?▾

No. This tool lowercases all letters except those at the start of sentences. You may need to manually re-capitalize proper nouns, acronyms, and the pronoun 'I' after conversion.

When should I use sentence case?▾

Sentence case is the standard for body text, paragraphs, descriptions, and any natural prose. It's also commonly used in UI labels, subtitles, and email communication.