If you're using a Mac, things are actually much simpler because the only tools you need are built directly into macOS. Apple's operating system comes with an app called Preview that lets you resize images individually and in batches.
One thing to note before doing this is that the previews will always replace the original image files when you resize them. If you want to keep the original files, copy them first, then resize the copies and keep the original images intact.
If you want to resize an individual image, do the following:
If you want to batch resize images, the process is similar, but you need to pay attention to a few things. First, select all the images you want in Finder and open them using Preview. Then, in Preview, make sure you select the thumbnails of all images you want to resize before using the Resize option.
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