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.
דער איבערזעצער אויף דער וועבזײַט װײַזט אױף אַודיאָ־פֿאָרמאַטירונגען װי MP3, WAV, FLAC, M4A, OGG און Opus, אַזוי די אױסגאַבע־פֿאָרמאַטירונג איז אַ באַשלוס װאָס דו קענסט איבערלאָזן ביז צום סוף, ניט צום אָנהייב Doing that after Rotate ICO rather than before means the encode happens once, on the file you actually settled on, instead of twice.
איז Rotate ICO דאָ דער זעלבער מכשיר װאָס די שוועסטער־סײַטן װײַזן?
No account is needed. Uploads and results are kept for about 24 hours, which leaves time to download the result, and are then deleted automatically; nobody reads, lists or indexes them. Several files in one job need a paid plan.