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1st Nov 2016 published by: Rob
Even though most content management systems have image editing capabilities it is always a good idea to resize and compress images first before uploading them to your website, as this will allow for faster image uploads, place less strain on the CMS & server side processing and allow for quick web page load times which is beneficial as page load speed is indeed a ranking factor used by most search engines.
If you need basic image editing software I can highly recommend Irfan View - it is absolutely free and I have been using it for over 15 years. It's a terrific little editor that comes packed with a multitude of features. It can resize images, compress images (reduce filesize with very little loss in quality) you can even add watermarks to your images and a host of other great features including batch processing of images. It can also be used as an image viewer.
Basically its photoshop for when you don't need photoshop. You can check out the docs and download if from their official website: http://www.irfanview.com/
Another great option & perhaps an easier solution is an online photo editor called PIXLR editor which can be found here: https://pixlr.com/editor/ it has an easy to use interface and allows you to upload your image and then crop, resize or manipulate it, then save it back to your computer - you can then upload it to your website.