If your using a windows pc, and have upgraded to Windows 11, there is a very useful application call windows powertools. It has a variety of different tools within it for many different uses, but one of the best tools, is the resize tool. When you have an image file within your filing system, you just right click, and then select resize images. It gives a very easy system of image file size change. You can create copies, it has defaults for different sizes and things like that. I find it very used for iceinspace rather than opening photoshop and everything. All you need to do is select the image in files, resize and then you are done. No "third party" software needed. Powertools is a windows based software. Find it in the microsoft store.
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