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Kompact vs 4K Image Compressor: catalog facts
Kompact	4K Image Compressor
Free Free and open source under the AGPL-3.0, with no account required.	Freemium Free download with a paid premium upgrade.
Android	Windows, macOS
Fully offline, images never leave the phone Batch compression with target size and quality settings	Compress to a percentage or an exact target file size Batch processing of many images
Android only Watermarking is limited to text	Some features are reserved for the paid premium tier Closed source
Downloadable app	Downloadable app
Open source	Closed source
License: AGPL-3.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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