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Converseen vs FastStone Photo Resizer: catalog facts
Converseen	FastStone Photo Resizer
Free Free and open source; donations accepted.	Free Free for personal and educational use.
Windows, macOS, Linux	Windows
Converts and resizes whole batches of images at once Supports over 100 image formats	Batch conversion and renaming in one tool Reads HEIC and WebP
Not a full image editor, only batch operations PDF conversion needs extra setup according to the help pages	Windows only Free licence covers personal and educational use 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 23, 2026	Official website Full listing and sources Checked October 2, 2026

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