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Preview vs Combine PDFs: catalog facts
Preview	Combine PDFs
Free Included with macOS at no extra cost.	Paid Sold through the developer's online store and the Mac App Store.
macOS	macOS
Already installed on every Mac Handles both PDFs and images	Drag and drop PDFs and images to build a new document Interleaves pages from two PDFs, useful for double-sided scans
macOS only No advanced editing of PDF text or OCR tools like dedicated editors	macOS only Paid app with no free version mentioned
Downloadable app	Downloadable app
Closed source	Closed source
License: Proprietary	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.