The still left the phone. Compatibility did not.
iPhone cameras write HEIC to save space. Inside Photos that is invisible. After AirDrop, Mail, or iCloud Drive on a PC, recipients see blank thumbs or “cannot open.” Installing HEVC extensions is a bad ask for a client, a parent, or a registrar. A PDF is the document they already have a reader for. This page is only that Apple-to-everywhere handoff. It is not a print-shop DPI essay and it is not a 200-page textbook batch guide. It is: take the stills you already shot, assemble a document in the browser, send one attachment. Safari on iOS works. A Mac that received the AirDrop works. The decode never goes to our servers — useful when the photos are kids, a passport, or a house you have not listed yet. If you wanted a JPEG for a chat app, that is a different converter. If the next stop is a campus print counter, continue to the printing spoke after you have a PDF.