Last updated: March 2026
Fixing ALL CAPS Text
We've all dealt with ALL CAPS text. It arrives from PDFs, scanned documents, legacy databases, government forms, and those emails from people who never learned about the Caps Lock key. Reading it is exhausting. Sentence case makes it readable again.
The conversion is simple in concept: lowercase everything, then capitalize the first letter after each sentence boundary (periods, exclamation points, question marks). But there are edge cases. Abbreviations with periods (U.S., Dr., etc.) can trick naive converters into starting new sentences. Our converter handles the most common patterns.
The main limitation of any automated sentence case converter is proper nouns. "JOHN WENT TO PARIS" becomes "John went to paris" — the converter can't know that Paris is a place name. For short text, this is easy to fix manually. For long documents, it's still faster to convert and fix than to retype everything.
Sentence case is the modern standard for web content. Google's Material Design guidelines, Apple's Human Interface Guidelines, and most modern style guides recommend sentence case for UI text, headings, buttons, and menu items. It's more readable and less formal than title case.
Common scenarios where you'll need this: converting text from PDFs or scanned documents, cleaning up data exported from old systems, reformatting copy-pasted content from websites with poor formatting, and normalizing user-submitted text in forms and databases.
Frequently Asked Questions
What is sentence case?
Sentence case capitalizes only the first letter of each sentence and proper nouns. It's how normal English prose is written: 'The quick brown fox jumps over the lazy dog.'
How does it detect sentences?
The converter looks for sentence boundaries — periods, exclamation marks, and question marks followed by a space. The first letter after each boundary is capitalized. The first letter of the text is always capitalized.
Will it capitalize proper nouns?
No. Sentence case conversion lowercases everything first, then capitalizes the first letter of each sentence. It can't detect proper nouns (names, places, brands). You'll need to manually capitalize those after conversion.
Can it fix ALL CAPS text?
Yes, that's one of its most common uses. Paste ALL CAPS text and it's converted to normal sentence capitalization. This is especially useful for text copied from PDFs, scanned documents, or old databases.
What's the difference between sentence case and title case?
Sentence case capitalizes only the first word of each sentence. Title case capitalizes the first letter of each major word. 'The quick brown fox' vs 'The Quick Brown Fox'.