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Combine PDFs vs Sejda PDF: catalog facts
Combine PDFs	Sejda PDF
Paid Sold through the developer's online store and the Mac App Store.	Freemium A limited free tier is available. Paid plans remove the limits.
macOS	Windows, macOS, Linux, Web
Drag and drop PDFs and images to build a new document Interleaves pages from two PDFs, useful for double-sided scans	Desktop version processes files entirely locally Online files are deleted automatically after a short period
macOS only Paid app with no free version mentioned	Free use is limited to a few tasks per hour and small documents Closed source
Downloadable app	Web application, Downloadable app
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 22, 2026

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