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Drop one TIFF or two hundred. Batch conversion is not a paid feature here.
A scan or a print-production TIFF needs to go on the web or into an application that cannot decode TIFF, and none of the detail can be approximated away.
The pixels are re-compressed with PNG's lossless DEFLATE. Nothing is discarded, transparency is carried through, and documents and line art usually shrink dramatically because TIFF was storing them uncompressed.
A 16-bit-per-channel TIFF can be stored as 16-bit PNG, but almost nothing downstream reads that, and any CMYK TIFF has to become RGB because PNG has no CMYK mode. Expect a colour shift on press-ready files.
Yes, for the pixel data. The losses are in the things PNG cannot represent: extra pages, CMYK, spot channels and most TIFF metadata tags.
Each page becomes its own PNG, delivered together. PNG has no concept of a multi-page document.
Drop one TIFF or two hundred. Batch conversion is not a paid feature here.
Portable Network Graphics is lossless, so nothing is thrown away in the conversion.
Converted and deleted the moment it finishes. Never written to permanent storage.