PNG files are common for screenshots and graphics with transparency, but many places that ask for a document upload expect a PDF specifically.
A PDF is the more portable, print-ready format for sharing a document, and combining several PNG screenshots into a single file is much easier to send as one attachment than several separate images.
PNG files can have transparent backgrounds; PDF pages don't support transparency in the same way, so transparent areas are filled with white in the output. For screenshots and scanned documents this makes no visible difference.
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Convert your PNGs to PDF →Transparent areas are converted to a white background, which looks identical to the original for typical screenshots and scanned documents.
Yes, the tool accepts both formats in the same batch.