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FastStone Photo Resizer vs Converseen: catalog facts
FastStone Photo Resizer	Converseen
Free Free for personal and educational use.	Free Free and open source; donations accepted.
Windows	Windows, macOS, Linux
Batch conversion and renaming in one tool Reads HEIC and WebP	Converts and resizes whole batches of images at once Supports over 100 image formats
Windows only Free licence covers personal and educational use only	Not a full image editor, only batch operations PDF conversion needs extra setup according to the help pages
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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