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Drop one HEIC or two hundred. Batch conversion is not a paid feature here.
Someone photographed a receipt, a passport page or a signed form on an iPhone and the other end will only accept a PDF.
Each HEIC is decoded and placed on its own page, sized to the photo's aspect ratio. The image is carried inside the PDF as JPEG data, so the document ends up close to the size of the equivalent JPEG rather than ballooning.
A PDF made from a photo contains no text, only pixels. Nobody can search or copy from it, and some government upload portals reject exactly that kind of PDF. Run OCR if the document has to be searchable.
Yes. Drop them all in and they become pages in the order you arranged them, which is the usual reason for doing this at all.
Phone photos carry an EXIF orientation flag rather than physically rotated pixels. The conversion applies that flag, but a photo shot with the phone flat sometimes has no reliable flag to apply.
Drop one HEIC or two hundred. Batch conversion is not a paid feature here.
Portable Document Format is lossy, so the quality control decides the trade between size and fidelity.
Converted and deleted the moment it finishes. Never written to permanent storage.