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Drop one JPG or two hundred. Batch conversion is not a paid feature here.
Artwork that only survives as a JPEG needs to be enlarged for print without the pixels showing.
The image is posterised into colour regions and each region is outlined as a path. The result scales infinitely, but it is a redrawing of the JPEG rather than a restoration of whatever the JPEG came from.
JPEG artefacts trace as if they were real detail. The 8x8 blocking around edges becomes wobble in the vector outlines, so a JPEG traces measurably worse than a clean PNG of the same artwork.
You can, but the output is a stylised poster effect, not a usable photograph. Vector formats have no good way to describe continuous tone.
Start from the largest, cleanest version you have, and reduce the number of colours before tracing so the engine has fewer, cleaner boundaries to follow.
Drop one JPG or two hundred. Batch conversion is not a paid feature here.
Scalable Vector Graphics is lossless, so nothing is thrown away in the conversion.
Converted and deleted the moment it finishes. Never written to permanent storage.