How to compress a JPEG on macOS using Preview

As camera quality increases, so do the file sizes of every image you take with them. Each megapixel adds considerable bulk to your files, and although storage space is getting cheaper, it’s failed to keep pace with the ever-growing size of the  images and videos we’re capturing with today’s smartphones.

Preview, a built-in tool for every Mac user, has a powerful image editor that allows you to do a number of things. Today we’re going to focus on one of those features, the ability to shrink images down to size and keep them manageable for long term storage either in the cloud, or on your device.

Please note, however, that before you delete anything that you’ve used Preview to shrink, it’s best to compare to make sure that the smaller image is still of a high enough quality to archive. If it’s not, it’s better to find out now, and switch to another compression setting, than it is to find it years later when it’s no longer something you can recover.

(Image credit: Laptop Mag)

1) Double-click to open the image in Preview.

2) In Preview, open the File menu

(Image credit: Laptop Mag)

3) In the File menu, select Export.

(Image credit: Laptop Mag)

4) In the Export as dialogue box, move the Quality slider to compress the image to the required size.

(Image credit: Laptop Mag)

5) Click Save to save the new compressed file.

(Image credit: Laptop Mag)



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