Here is a short tutorial to show you how to crop an image in the free version of Pixlr
If you are adding this image to a website make sure your image is not too big. If it is resize it. Big images take up a lot of data and they slow down your website.
Also, don’t forget that search engines (like Google) do not read or understand images. They just skip over it as if there was nothing on your page.
Watch my video on how to optimize image for SEO.
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