if you don't find required format in the dropdown, write your extension without dot like tiff, bmp, etc. Most probably we already supporting that.
30 files allowed to be converted in one batch. Maximum file size allowed for upload is 16MB.
Convert images from one format to another (PNG, JPG, GIF and many more are supported). We use convert utility. So, you could check their documentation for supported format. We support almost 60+ formats.