How to batch resize images on Mac

1. Open all the images in one Preview window (select them in Finder and open them together).
2. Click in the sidebar and press Command-A to select every image.
3. Choose Tools > Adjust Size, enter the width and height or a percentage, and click OK.
4. Choose File > Save, or export copies if you want to keep the originals.

Preview changes the files it saves, so work on copies if you need the originals.

Resize Images scales many photos at once by a percentage, to a set longest side, or to an exact width and height. You can keep proportions and choose whether smaller images should be enlarged. The resized copies go to a new folder, and the originals are left alone.

1. Open Resize Images and drop your photos.
2. Choose Resize by: Percentage, Longest Side or Size.
3. Enter the value, and set Keep proportions or Enlarge smaller images as needed.
4. Click Resize to save the copies to a dated folder in Downloads.

• To make every photo 1920 px, use Longest Side and enter 1920. Landscape and portrait photos both end up with a 1920 px long edge.
• Images already smaller than the target are left at their size unless you turn on Enlarge smaller images.
• With Keep proportions off, Size stretches images to exactly the width and height you enter.
• To also reduce file size, follow up with Compress Images.