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.
No. Remove JPEG Background is free without an account and adds no watermark. The upload and the result are deleted automatically about 24 hours after the job, which leaves time to download the result.
It depends on the tool. Compression strips EXIF and the embedded colour profile to save space, while edits such as resizing or rotating can keep them. There is no setting on this page to choose, so check the file with a metadata viewer before publishing it if location data matters.
ئایا پێویستم بە حسابێک هەیە، ئایا هیچ شتێکی تێدایە؟
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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.