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PicView vs gThumb: catalog facts
PicView	gThumb
Free The software is free under its open-source licence. Hosting, hardware and external…	Free Free and open source under the GPL version 2 or later.
Windows, macOS	Linux
It opens almost every image format including animated WebP and GIF, SVG, AVIF, HEIC, PSD and comic book…	Native GNOME desktop application Works on local folders without a server
It is a viewer with light editing only, and there is no Linux build.	Linux only No cloud sync or phone backup
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-2.0-or-later
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 September 23, 2026

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