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Resize Images on Mac without Editing Software

Use Preview to Resize Images, without a Photo Editing Program

Resize Image in Preview

You can resize images in the system application Preview:

  • open image in Preview (by double-clicking on image; or find Preview in your applications folder and drag & drop image onto the application)
  • click Tools
  • choose Adjust Size
  • change Width & Height to view in pixels (if necessary)
  • change Resolution to 72
  • change Width & Height to size you wish

There are other adjustments you can make to photos in Preview - under Tools

Crop Image in Preview

We recommend cropping your image before you resize it, if necessary.  You can access the crop tool from view > customize toolbar. Add the crop function


  • make sure the row of tools is displayed (click on the toolbox icon - says Show Markup Toolbar when hovering over it)
  • click inside image
  • drag your cursor to desired crop area (a rectangle marquee tool shows up) 
  • click on Crop (crop only shows after you have selected a portion of the image for cropping)

After cropping:

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