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.
چی ڕوودەدات بە DOC من دوای دروستکردنی XLSX؟
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It is deleted automatically. Both the uploaded DOC and the produced XLSX are removed about 24 hours after the conversion, and no person sees the contents in the meantime. Details are at /privacy/.