ShortPixel is arguably the top WordPress image optimization plugin: simple to set up, it can automatically optimize both your old and new images, as well as PDF files. Your images can also be seamlessly converted to WebP and/or AVIF formats. All thumbnails can be recreated using the SmartCrop feature, ensuring that the subject of the picture is attractively displayed, no matter the size of the thumbnail. Additionally, the service offers friendly and prompt support, available 24/7 throughout the year.