This way, you will create a new JPEG, which will be reduced in size, but its quality will be retained, as much as possible.ĭifferent file formats are used for different types of visual content depending on how they sustain compression. Click Save and rename the image if you want.Export as a JPEG, and don’t play with the Quality option unless you want to decrease the quality.Open the new TIFF file in Preview, then go to File ➙ Export.Open the Compression menu and select JPEG.Export as TIFF by opening the format dropdown menu and selecting TIFF.Locate the image you want to resize, then double click to open it in Preview.To compress photos without losing their quality by using the Preview app on your Mac, follow these steps: However, if you do this, your image will become a lot less clear, which is not what we want most of the time. The simplest way to compress a JPEG is by changing its dimensions and resolution. Ways to shrink JPEG file size on Mac without losing quality However, if you wish to print a photo, or enlarge it later, you’ll need to compress it in a different way that won’t affect the image’s resolution. This way to reduce photo size by reducing quality is probably the easiest. Enter a filename for your image and click Save.Select File ➙ Save As to create a new copy of your JPEG.Check Resulting Size section to make sure new image size is right for your needs.Adjust the Width, Height, and Resolution, then click OK.Choose Percent or Size as adjustment value.Click Tools on the menu bar, then choose Adjust Size.Navigate to the photo you want to compress and select Open.Go to Applications and launch the Preview app.Here is how to reduce JPEG file size in Preview: Lossless compression means that the image quality will be retained, while as a result of a lossy compression, some photo data will be lost, impacting its quality. Reduce photo size by reducing resolution using PreviewĮvery macOS has a version of Preview, an image and PDF viewing app which lets you look over and print images or PDF files, as well as edit all kinds of image formats.īefore you begin to compress a JPEG, note that there are two types of image compression: lossless and lossy. Let’s get into the details of how you can quickly and easily shrink JPEG file size on Mac.

Mac image compression software