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PDF4QT vs PDF-XChange Editor: catalog facts
PDF4QT	PDF-XChange Editor
Free Free and open source; donations are accepted through GitHub Sponsors.	Freemium Most features are free. Some tools add a watermark unless you buy a licence.
Windows, Linux, Command line	Windows
Viewing and editing applications in one project Command-line tool for scripted PDF work	Most features work in the free version rather than being blocked Fast rendering and a genuinely capable annotation toolset
No macOS version Mostly the work of a single principal developer	Paid-only features watermark output rather than being hidden Windows only, closed source
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	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 1, 2026	Official website Full listing and sources Checked September 22, 2026

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