how to change the size of an image on mac

If you already know how to convert images from one format to another, you may also use those methods.Īnd if you take lots of screenshots, you can use an easy Terminal command to change Mac’s screenshot format to reduce size. In the steps below, you will see how to change the image format.

Sometimes the file size reduction is up to 98%! JPG offers almost the same picture quality as PNG but significantly reduces file size. If the screenshot only has text (like that of the iPhone Settings app), I almost always keep it in PNG format.īut if the image has graphics (like the screenshot of Home Screen with app icons), I convert it to JPG in 99.9% of cases. By default, Apple devices take and save screenshots in PNG format. I take dozens of screenshots on iPhone and Mac every day for my articles. Reduce image file size by changing their format Now that you know the basics about image file size, here are some quick ways to convert large images on Mac to smaller sizes. This is because the sharper screen has more pixels and image dimensions, resulting in bigger screenshots. Screen resolution: The screenshot file size of my new retina 13-inch MacBook Pro is far more than that of my non-retina 13-inch MacBook Pro.Flash: If you use flash while shooting pictures, this will result in an image with increased file size.

Camera type: Pictures taken by the front iPhone camera or the MacBook’s webcam will almost always have a smaller file size than the primary camera, which runs into several megapixels.

Image content and color depth: If there are many black portions in the image instead of white, it can have a smaller file size.

But if your image is mainly text-based, PNG is better.

Image format: For most pictures, JPG/JPEG tends to have a smaller file size than PNG.

Image dimensions: A 1920 x 1080 image will have a bigger file size than a 720 x 480 image.

The file size of a photo depends on various things like: Use online sites to compress images Factors on which the image file size depends

How to change the size of an image on mac