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K2pdfopt vs pdfCropMargins: catalog facts
K2pdfopt	pdfCropMargins
Free Free to download; the developer states it is open source.	Free Free and open source.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Reflows multi-column and scanned PDFs for small screens Optional OCR layer on output	Automatic margin detection Command line and GUI in one package
Graphical interface is built in only on Windows Releases are infrequent, the latest being v2.55 from December 2023	Infrequent releases Does one job only
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
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.