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FastStone Image Viewer vs Microsoft Photos: catalog facts
FastStone Image Viewer	Microsoft Photos
Free Free for personal use. Commercial use requires a paid licence, and the related FastStone…	Free Free and included with Windows.
Windows	Windows
Handles every common format including HEIC, WebP, PSD, PDF and camera raw Browser, viewer, basic editor and batch converter in one small program	Preinstalled and updated through the Microsoft Store Combines local photos and OneDrive in one gallery
Free for personal use only; commercial use requires a licence Windows only	Windows only iCloud Photos integration requires Windows 11
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	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 October 2, 2026

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