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Drop one EMF or two hundred. Batch conversion is not a paid feature here.
A diagram copied out of Word, Visio or an old Windows application is an EMF that nothing outside Windows will open.
EMF records a sequence of Windows GDI drawing commands. Those are replayed and written out as SVG paths and text, producing something any browser or vector editor can read.
EMF is a recording of drawing calls, not a document, so it has no page or coordinate system of its own. The bounding box in the header is frequently wrong, which is why converted metafiles often arrive cropped or floating in a much larger canvas.
Copying a chart or diagram out of an Office application on Windows usually produces one, as does printing to a metafile.
Vector, but it can contain embedded bitmaps. Those come across as embedded images inside the SVG.
Drop one EMF 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.