Sentence Case Converter — Fix Capitalization & Convert to Sentence Case Free
Instantly convert any text to proper Sentence case — first letter of each sentence capitalized, everything else lowercase. Perfect for fixing emails, essays, and pasted text. Free and private.
When to Use Sentence Case
Sentence case is the natural capitalization for everyday writing. Here are the most common situations where it is required or preferred.
Sentence case is the natural format for professional emails, chat messages, and standard written communication — clear, readable, and universally accepted.
All regular paragraphs, blog posts, articles, and essays use sentence case. It is the default capitalization standard for readable long-form writing.
Convert text accidentally typed in CAPS LOCK to proper sentence case without retyping entire paragraphs — just paste and convert in one click.
Convert hastily typed text to proper sentence case before publishing on LinkedIn, Twitter, Instagram, or any other platform.
Normalize text fields in spreadsheets or databases where entries have inconsistent capitalization — making data cleaner and easier to sort.
Fix capitalization issues in pasted text from PDFs, OCR output, or other sources that frequently produce incorrectly cased content.
How to Use the Sentence Case Converter
Enter any text regardless of its current capitalization — ALL CAPS, mixed case, or random capitalization.
First letters of sentences are capitalized; everything else is lowercase. Multi-sentence paragraphs are handled correctly.
Click Copy Output to copy the result to your clipboard, or Download .txt to save as a file.
Frequently Asked Questions
What is Sentence Case?
Sentence case capitalizes only the first letter of the first word in each sentence and the pronoun "I". All other letters are lowercase. It is the standard capitalization used in regular paragraphs, emails, and everyday writing.
What is the difference between Sentence Case and Title Case?
Sentence case capitalizes only the first word of each sentence (e.g., "The quick brown fox"). Title Case capitalizes every major word (e.g., "The Quick Brown Fox"). Sentence case is for body text; Title Case is for headlines and titles.
Does it capitalize the pronoun "I"?
Yes. The converter correctly capitalizes the standalone pronoun "I" throughout the text, as required by standard English grammar rules.
Does it handle multiple sentences?
Yes — it detects sentence boundaries at periods, exclamation marks, and question marks, and correctly capitalizes the first letter of each new sentence throughout the entire text.
Can it fix ALL CAPS text?
Yes. Paste any ALL CAPS text and it will be converted to proper sentence case — first letters of sentences capitalized, everything else in lowercase.
Is there a character limit?
No. Paste as much text as you want — any length is handled instantly in your browser.
Is my text private?
Yes. All conversion happens in your browser using JavaScript. Your text is never sent to any server, never stored, and never shared.
When should I use Sentence Case?
Use it for body text in articles, emails, social media posts, product descriptions, and any regular prose writing. It is the natural, default capitalization for standard English writing.
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