Sentence Case
Convert text to sentence case — capitalizes the first letter of each sentence and lowercases the rest. Free, instant, client-side case converter.
🔒 100% Client-Side Processing
Your data is processed entirely in your browser and never transmitted to any server.
0 / 100M Limit
Common Use Cases
Fixing pasted headlines
Convert ALL-CAPS or Title Case text from press releases and PDFs into normal sentence capitalization for body copy.
Normalizing user submissions
Clean up form input and imported comments where users typed entirely in caps or lowercase.
Editing subtitles and captions
Reformat caption files that arrived in uppercase into natural sentence-style text.
Frequently Asked Questions
- How does the sentence case converter decide what to capitalize?
- It lowercases everything, then capitalizes the first letter of the text and any letter following a sentence terminator (. ! ?). The result mimics natural prose capitalization.
- Will proper nouns stay capitalized?
- No — the converter cannot recognise names, so "i met john in paris." becomes "I met john in paris." Re-capitalize proper nouns manually after converting.
- Is my data private when I use this tool?
- Yes. This tool runs entirely in your browser using client-side JavaScript — nothing you type is transmitted to, logged by, or stored on any server. You can safely process confidential text, tokens, or code.