EdiKer is described as '1. It’s free. 2. You don’t need to sign up or install anything to use it. It works in any modern browser. 3. Unlike other photo editing websites, your photos don’t get uploaded/downloaded. All your image processing is done on your end. That makes EdiKer fast'. There are more than 10 alternatives to EdiKer for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and Windows S. The best alternative is XnConvert. It's not free, so if you're looking for a free alternative, you could try Online Image Converter or HRConvert2. Other great apps like EdiKer are GraphicConverter (Paid), Kigo Image Converter (Paid), ImBatch (Free Personal) and Free Image Convert and Resize (Free).
XnConvert is an easy image converter for graphic files, photos and images available on Windows, MacOSX and Linux. It supports more than 400 file formats (jpeg, tiff, png, gif, camera raw, jpeg2000, WebP, OpenEXR, ...).
Online Image Converter converts your BMP, JPG, PNG, GIF or ICO files quickly and easily. It is completely free. Note that your image must not exceed 700Kb in size. If your image is larger, use Total Image Converter.
ImBatch is a batch image processor with a nice graphical user interface. It will allow you to edit multiple image files at the click of a button by using scripts. The script will be created by combining Tasks.