How to Create Thumbnails or Resize Images on Your Mac

This guide will show you how to quickly and easily and create thumbnails or resize images on your Mac, in batches. Using ThumbsUp you can easily drag-and-drop one or more images to resize them. It supports any and all image formats supported by macOS – including PDF documents.

There are a whole slew of ways to batch resize images in macOS. Using Preview is one of the more popular methods, and there’s always Photoshop. Or, you can do it the super-easy way –

  1. First things first, download and install the small (and free) ThumbsUp application from Devon-Technologies. Just open the zip, then the .dmg, then drag ThumbsUp to your Applications folder. Launch it from there.
  2. ThumbsUp resize images in a Finder window

  3. The Preferences window will appear. From here you can define how you want your images to be created – including size, quality, file type and file name.
  4. ThumbsUp Preferences panel

  5. After you’ve set the preferences to your liking, close the window (but don’t quit the App). Drag one or more images – or folders of images – onto the ThumbsUp icon in your macOS Dock.
  6. dragging images onto the ThumbsUp icon in the macOS Dock

  7. The thumbnails/resized images will be created for each and every one of the original files. The output format, name and size will all depend on how you opted to set up ThumbsUp, and the new files will be created in the same folder as the originals.
  8. resized images in a Finder window

  9. That’s it! Hopefully you agree that this is the easiest method to resize images on a Mac! :)

If you also use Windows for editing images we have a guide that uses a very similar utility to resize images in Windows.

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1 thought on “How to Create Thumbnails or Resize Images on Your Mac”

  1. I’ve got a couple of shell scripts I’ve written to do similar work, but it’s a pain to remember the parameters each time I use it. Photoshop has a similar batch processing script, but this is certainly a nicer looking tool than both of those – thanks!

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