WhatsApp technically allows fairly large file attachments, but a big PDF can still be slow to send over mobile data, and some recipients have their own storage or data limits that make smaller files more considerate to send.
Unlike email, WhatsApp is often used over mobile data on both ends. A smaller file sends faster, uses less of the recipient's data allowance, and avoids the "stuck at 99%" upload experience that can happen with large attachments on a weak connection.
Ready to try it yourself?
Compress your PDF for WhatsApp →At a moderate setting, most people won't notice a difference viewing on a phone screen.
Yes, the compress tool works the same way in a mobile browser as it does on desktop.