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gThumb vs PhotoQt: catalog facts
gThumb	PhotoQt
Free Free and open source under the GPL version 2 or later.	Free Free and open source. The developer asks that you consider donating to humanitarian relief…
Linux	Linux
Native GNOME desktop application Works on local folders without a server	More than 140 image formats, plus photo spheres, motion photos and Apple live photos Embedded and interactive maps for images with GPS data
Linux only No cloud sync or phone backup	Image manipulation is per-session only; it is a viewer, not an editor Some features need extension packages that not every installer includes
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later	License: GPL-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 21, 2026

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