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Drop one PNG or two hundred. Batch conversion is not a paid feature here.
A design or scan held as PNG has to be delivered as TIFF because that is what the print or archive specification says.
Both formats are lossless, so this is a repackage. The pixels are identical; the container changes to one that supports multiple pages, CMYK, embedded ICC profiles and a much richer metadata model.
PNG's alpha channel does not always survive the trip. TIFF can store an alpha channel, but plenty of print software ignores it or renders it as an unexpected white or black plate, so flatten deliberately rather than leaving it to chance.
LZW or ZIP for lossless output. Uncompressed TIFF is only worth it for software too old to decode either.
Yes. TIFF supports multiple pages in one file, which is why document scanners produce it.
Drop one PNG or two hundred. Batch conversion is not a paid feature here.
Tagged Image File is lossless, so nothing is thrown away in the conversion.
Converted and deleted the moment it finishes. Never written to permanent storage.