How to change default image size?

WordPress creates this kind of image size by default:

• Thumbnail;
• Medium;
• Medium Large;
• Large.

The default image sizes are as follows:

• 150px square for thumbnails;
• 300px width for medium images;
• 768px max width for medium_large images;
• 1024px max width for large images.

If you want to change default image sizes in the WordPress Dasboard find Media->Settings. An image below.

Important!!! If you change default WordPress image size, you need to reupload your images.