Several files in one job need a paid plan. Free use is one file per conversion, one conversion an hour. On a paid plan you can add several files to one job, then download each result on its own or all of them in one ZIP.
Yes. Uploads travel over HTTPS, nobody reads the contents, and nothing is shared. Your uploaded GIF and the resulting TIFF are deleted from our servers automatically about 24 hours after the conversion, which leaves time to download the result.
