How do I stretch an image in Preview?
Resizing in Preview
To start, select the image you want to resize by clicking Open With > Preview. Once you have your image opened, go to Tools in your menu bar and select Adjust Size.
How do I stretch an image in Preview Mac?
In the Preview app on your Mac, click the Show Markup Toolbar button (if the Markup toolbar isn't showing), then click the Adjust Size button . Enter new values for width and height, or click the “Fit into” pop-up menu and choose a size.