WhatsApp can do more than send messages and photos. A hidden tool inside the app turns stacks of paper into tidy digital files in just a few taps.
You can use a Mac's default image-viewing program, Preview, to resize any image or multiple images at once. Here's how to resize images on a Mac.
It's easy to crop a PDF on a Mac computer in just a few steps using the Preview app. Here's what you need to know to do it.
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