Sentence Case Converter

How to Use Sentence Case Converter

• Paste the draft text that needs case cleanup.
• Choose Sentence case for normal prose, lowercase for normalization, UPPERCASE for emphasis, or Title Case for headings.
• Enable lowercasing of non-initial letters when pasted text contains inconsistent capitalization.
• Use the character and word counts to check whether the conversion changed only case and not content length unexpectedly.

Formula & Theory - Sentence Case Converter

Sentence case:
1. Detect sentence boundaries: . ! ? 。！？
2. Find the first alphabetic character after each boundary
3. Uppercase that character
4. Optionally lowercase the remaining letters

Sentence case depends on punctuation boundaries. After a period, exclamation mark, question mark, or common CJK sentence mark, the converter looks for the next alphabetic character and capitalizes it.

Title Case applies a simpler word-start rule. It is useful for quick headings, but it does not apply specialized style-guide exceptions for short prepositions or brand names.

The converter preserves whitespace, line breaks, punctuation, and non-Latin text as much as possible.

Use Cases for Sentence Case Converter

• Cleaning text pasted from all-caps emails or inconsistent notes.
• Preparing headings, social posts, or product descriptions.
• Normalizing text before importing it into a CMS.
• Counting words while editing copy length.