If you have PowerToys installed then you can enable the "Image Resizer" module which will let you resize multiple files from File Explorer. Select the files, right-click, then select "Resize with Image Resizer"
More info available here
https://learn.microsoft.com/en-us/windows/powertoys/image-resizer
Note if you're dealing with large PNG files, the resized files will still be too big. Convert them to JPG first by opening them in the Photos app and Ctrl+S (Save as...) to save them as JPG and now they're ready to be resized.
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Last edited by sonorance at 23-8-2024 15:42 ]