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Caesium Image Compressor vs Converseen: catalog facts
Caesium Image Compressor	Converseen
Free Free and open source under the GPL.	Free Free and open source; donations accepted.
Windows, macOS, Web	Windows, macOS, Linux
Batch processing with visible before and after sizes for the whole folder Resize at the same time as compressing, in one pass	Converts and resizes whole batches of images at once Supports over 100 image formats
No official Linux binary; you compile it or use a third-party build Windows 10 build 1809 or later and macOS 12 or later, 64-bit only	Not a full image editor, only batch operations PDF conversion needs extra setup according to the help pages
Downloadable app, Web application	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
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 23, 2026

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