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What is WhatsApp's PDF size limit?
WhatsApp allows document attachments up to 100 MB. However, some older app versions and certain regional servers may apply a stricter 16 MB limit.
My PDF is a scanned document - will compression work well?
Yes. Scanned PDFs are almost entirely images and compress very well. The Compact mode can reduce a scanned PDF by 50-80% while keeping it readable.