We are preparing a new feature for rethumb: format conversion.
At the moment our API creates images with the same image format as the input.
E.G.: PNG images are converted to PNG thumbnails, etc.
This new feature will allow our users to select the output format.
In that way it’ll be possible to convert PNG images to JPG thumbnails, etc.
Our API will support conversion from PNG, JPG, GIF, TIFF and WEBP to PNG, JPG, GIF, TIFF and WEBP.