DataChef
The web application "DataChef" is a collection of online tools for image and video conversion.
This is a collection of single and simple functions, for example, a page to invert colors, a page to detect edges of images, a page to convert video clips to loop seamlessly, and so on.
DataChef is 100% free to use and there is no need to install or register.
All you have to do is upload a file and download the converted file.
So it's very easy to use.
ImageChef
ImageChef is one of DataChef's sub-brands that provides simple functions of image processing.
Try ImageChef
MovieChef
MovieChef is one of DataChef's sub-brands that provides simple functions for video editing.