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qView vs FastStone Image Viewer: catalog facts
qView	FastStone Image Viewer
Free Free and open source under the GPL.	Free Free for personal use. Commercial use requires a paid licence, and the related FastStone…
Windows, macOS, Linux	Windows
Opens essentially instantly, which is what a double-clicked image needs No interface chrome; the window is the image	Handles every common format including HEIC, WebP, PSD, PDF and camera raw Browser, viewer, basic editor and batch converter in one small program
No editing, tagging or library management at all Metadata display is minimal	Free for personal use only; commercial use requires a licence Windows only
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
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.