Sentence Case Converter
Convert any text to sentence case instantly. Capitalizes the first letter of each sentence while lowercasing everything else. Fully private — your text never leaves your browser.
Three steps to sentence case
Paste your text
Type or paste any text — paragraphs, headlines, or copied content — into the input field.
Instant conversion
The text converts to sentence case in real time. The first letter of each sentence is capitalized, everything else lowercased.
Copy or download
Click Copy to grab the result, or download as a .txt file. Zero data leaves your browser.
What is sentence case and when should you use it?
Sentence case is the most natural way to write: only the first word of a sentence (and proper nouns) gets a capital letter. It's how we write everyday prose — emails, articles, documentation, and most digital content.
Unlike title case (where most words are capitalized) or all caps, sentence case reads naturally and is widely recommended for UI text, button labels, and modern web content. Google's Material Design, Apple's Human Interface Guidelines, and most SaaS products use sentence case for their interfaces.
Common use cases for this converter:
- Cleaning up text that was accidentally typed in all caps or title case
- Normalizing content copied from documents or PDFs with inconsistent casing
- Converting social media posts or headlines to sentence case for readability
- Preparing body text for websites, apps, or documentation
- Fixing pasted content before publishing or editing
The converter first lowercases your entire input, then capitalizes the first letter after sentence-ending punctuation (period, exclamation mark, question mark). It processes text entirely in your browser — zero server requests, complete privacy.