How to set the size of thumbnails?

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How to change the default size of thumbnail images generated by WordPress? Read this article and you’ll know everything you need! 

WordPress creates thumbnails in three sizes – small, medium and large. These sizes can be of course changed in very simple and easy way by clicking to the Settings > Media.

In Media section there is a window with sizes and possibility to change it. All you must do is write the size you want and… that’s it! Done!