Prodcut images are some of the most important elements of the product pages that helps in driving conversions. The images provide visual information about the product to the visitors that help them making purchases. Sometimes, the size of product images in Magento 2 may not best fit your storefront. Therefore, you may require to change the default product image size in Magento 2. There is no backend option in Magento 2 to do that, however, the image size can be easily changed by tweaking a few lines of codes. In order to change the default product image size in Magento 2, you must understand the image id, type and parameters first. I have provided complete details on the image id, types, and parameters along with the programmatic solution to change the default product image size in Magento 2.