How it works
The Sentence Case Converter reformats text so that only the first letter of each sentence is capitalized, with all other letters lowercased. It correctly detects sentence boundaries at periods, exclamation marks, and question marks followed by a space.
Sentence case is the standard for body text, app notifications, form labels, error messages, and user interface copy. Many style guides (Google, Microsoft, Apple) recommend sentence case over title case for UI text because it reads more naturally and feels less formal.
How to use it: paste your text — whether it's all-caps, mixed-case, or already partially formatted — into the input. The tool normalizes it to clean sentence case instantly. It handles multi-paragraph input, list items, and content with abbreviations gracefully.
Why developers and writers use it: pasted content from PDFs, spreadsheets, or legacy systems often arrives in inconsistent case. The Sentence Case Converter is the fastest way to normalize a paragraph or list of items before publishing. Since it runs in the browser, you can safely paste draft content, internal documents, or client copy without any privacy risk.
Common workflows: cleaning up all-caps text from legal documents, normalizing scraped product descriptions before import, correcting mixed-case copy from legacy systems, preparing interface strings for localization, and converting presentation bullet points to sentence-case for app notifications.
Frequently Asked Questions
- It splits on periods (.), exclamation marks (!), and question marks (?) followed by a space or newline. Abbreviations like 'Dr.' and 'e.g.' are handled by a known-abbreviation list to avoid false sentence breaks.
- The tool first lowercases the entire text, then capitalizes the first letter of each detected sentence. This produces clean sentence-case regardless of the original capitalization.
- No. The tool only capitalizes the first letter of each sentence. It does not attempt to identify or re-capitalize proper nouns — that would require natural language processing beyond a simple formatter.
- Yes. Each paragraph is processed independently, correctly capitalizing the first letter of each paragraph and each sentence within it.