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Master PDF Editor vs PDF4QT: catalog facts
Master PDF Editor	PDF4QT
Freemium An unregistered version offers limited non-commercial functions. Full editing requires a…	Free Free and open source; donations are accepted through GitHub Sponsors.
Windows, macOS, Linux	Windows, Linux, Command line
One of the few complete PDF editors with a real Linux build Handles forms, signatures and OCR alongside content editing	Viewing and editing applications in one project Command-line tool for scripted PDF work
The unregistered version is limited and for non-commercial use only Closed source	No macOS version Mostly the work of a single principal developer
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 1, 2026

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