Make a PDF smaller for WhatsApp, email and WeTransfer
1 min read·24 July 2026
WhatsApp allows attachments up to 100 MB, but large PDFs load slowly and are awkward to receive. With PDFrust you quickly reduce a PDF so it is easy to share.
What is the maximum PDF size for WhatsApp?
WhatsApp allows attachments up to 100 MB. In practice recipients find large files annoying: they load slowly on mobile data and take up a lot of storage. Aim for PDFs under 10 MB for comfortable WhatsApp sharing.
How small should a PDF be for email?
Gmail, Outlook and Apple Mail accept attachments up to 20-25 MB. But corporate email servers sometimes have stricter limits (5-10 MB). To make sure your email arrives, keep your PDF under 5 MB.
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Which compression strength should I choose?
For WhatsApp and email "Medium" is the best choice: file size drops significantly while readability stays good. Choose "High" if the PDF contains drawings or photos that need to stay clear. Choose "Low" only if file size is the only criterion and quality matters less.
Alternatives when compression is not enough
Convert the document to black and white (grayscale tool) — this often saves more than compression. Or split the document into smaller parts. If WhatsApp still refuses it, use WeTransfer or Google Drive for larger files.
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