very VERY efficient to use, no boring ads, all that annoying stuffthere's like a million different tools to use, you can resize images (and you can resize them in bulk!), compressing images, cropping, flipping, rotating, enlarging, you name it!!! not only that, but you can also change the files itself! like from PNG to JPG, PNG to SVG, etc etc. there's even an app for the website itself available on android!!!