Publitio offers URL-Based form of API through which you can do all the file transformations on the fly & instantly, just over the browser, by changing the parameters in the file url. You can use it to transcode your files between formats, for resizing, coping, trimming, watermarking and/or quality adjustment. In plain english: you can change format of any file by just changing extension from .png to .jpg or WEBP when image is in question or video from mp4 to avi via url.