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jdPixelUpscaler vs Upscayl: catalog facts
jdPixelUpscaler	Upscayl
Free Free and open source under GPL-3.0-only.	Free Free and open source under the AGPL. There is no paid tier and no per-image cost.
Linux	Windows, macOS, Linux
Preserves solid pixel blocks when enlarging images Includes command-line arguments and a D-Bus interface	Runs entirely on your own machine, so no images are uploaded anywhere Batch processing for whole folders
Does not account for neighboring pixels or image transitions Linux only	Needs a Vulkan-compatible GPU; the project warns many integrated chips will not work Slow on weaker hardware, and memory-hungry on large images
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: AGPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 21, 2026

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