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UPSCAYL https://www.upscayl.org/
From the web site: " ... With state of the art AI, Upscayl helps you turn low resolution images into high resolution. Crisp and sharp! ... "


Upscayl is Free, Open Source and Portable.
If you want the portable version select: "Portable Zip"

Sofpedia page: https://www.softpedia.com/get/Multimedi ... cayl.shtml
Github: https://github.com/upscayl/
Releases on Github: https://github.com/upscayl/upscayl/releases/

There are versions of Upscayl for Mac, Linux and Windows 8 and above.
Size of the Zip (portable version): 275Mb
Last updated: February 29, 2024

Vulkan compatible GPU required.

There is a workaround to use CPU only under Windows and Linux, but I bet this will make the processing intolerably lengthy.

Andrew Lee wrote: ↑Thu Mar 14, 2024 3:53 pm Vulkan compatible GPU required.

Yes, "similar" situation with NiceScaler a "similar" app: viewtopic.php?p=104171

Many of these "Sharpener Tools" claiming to be based on AI require "NVDIA/AMD/Intel GPU".
Two more tools (by the same developer) to add to the list:
https://bggenerator.com/batch_ai_photo_sharpener.html
https://bggenerator.com/pngenlarger.html

Same thing with Photo Magic AI.
See also Andrew's comment ( viewtopic.php?p=106653#p106653 )