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FastStone Image Viewer vs PhotoQt: catalog facts
FastStone Image Viewer	PhotoQt
Free Free for personal use. Commercial use requires a paid licence, and the related FastStone…	Free Free and open source. The developer asks that you consider donating to humanitarian relief…
Windows	Linux
Handles every common format including HEIC, WebP, PSD, PDF and camera raw Browser, viewer, basic editor and batch converter in one small program	More than 140 image formats, plus photo spheres, motion photos and Apple live photos Embedded and interactive maps for images with GPS data
Free for personal use only; commercial use requires a licence Windows only	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
Closed source	Open source
License not stated	License: GPL-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 21, 2026

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