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img2pdf vs IceBox: catalog facts
img2pdf	IceBox
Free Free and open source.	Free Free and open source under the GPL-3.0 licence.
Windows, macOS, Linux, Command line	Linux
Lossless conversion with no re-encoding of images Small output files	Single purpose: images in, one PDF out Available as a Flatpak
Command line only, no graphical interface Only converts images to PDF, no editing	Does not edit or merge existing PDFs Small project with limited development history
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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