You can send the original presentation file, but is advisable to send only the diapos images (follow the guides below).
Compress the resulting folder in a .zip file then email it.
Please don't send PDF: it must in any case be converted in images before publication on the Web.
If, due to its big size, it's no possible to email the zipped folder, please use a service like FileSender GARR or WeTransfer.
The FileSender GARR Service is available - free of charge - for all the members of Federazione IDEM
(more info at FileSender: il nuovo servizio GARR per l'invio di file "fuori misura",
amongst which there is the CNR, many Universities and many Italian research institutions (full list at IDEM GARR AAI - Partecipanti.
Export on Mac (example is Office for Mac 2016, other versions are similar)
(1/5) Click on File on the upper left menu bar and select Esporta.
(2/5) Default export format option is PDF: select JPEG, instead.
(3/5) After selecting JPEG format choose Salva ogni diapositiva. Then click on Esporta
(5/5) Final result: see the folder containing your slides.
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Export on Windows (example is Office for Windows 2019, other versions are similar)
(1/7) Click on File on the upper left menu bar.
(2/7) On the left side of the application window select Esporta then click on Cambia tipo di file (default option is Adobe PDF).
(3/7) On the dropdown menu which appeared on the right side, select File JPEG, then click on Salva con nome.
(4/7) Choose a name then click on Salva.
(5/7) Choose the first option: Tutte le diapositive.
(7/7) Final result: see the folder containing your slides.
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Tip to create new presentations
If you start a new presentation (video projection or web publishing) choose these formats for a better vision on latest devices: 1280 width × 720 height or 1440 width × 900 height (16:9 or 16:10 resolution respectively).
They are commonly called widescreen format (opposite to standard 4:3 resolution format: 960 width × 720 height or 1024 width × 768 height).
Both versions of PowerPoint allow you to do so (in the program window on the upper menu bar go to Progettazione then select the second-last menu item: Dimensioni diapositiva).