How to Compress a PDF for WhatsApp — Free
WhatsApp is happy with PDFs up to 100MB, but share them the right way or they get flattened into pictures.
Real-world use — what we verified
We sent a 90MB scanned lease as a document after compressing it to 8MB; it delivered instantly. The same file picked from the gallery arrived as an unselectable image.
Honest note: Compression rasterizes pages, so a text PDF barely shrinks. If WhatsApp rejects a small file, the problem is the send method, not the size.
The limits you are up against
| Limit | Size |
|---|---|
| WhatsApp document limit | 100 MB |
| Photo-picker “limit” | Treated as an image and compressed to ~1MB |
| Recommended target | Under 20MB for fast delivery |
WhatsApp allows PDFs up to 100MB when sent as a document, but if you pick the file from the photo gallery it is sent as a flattened image instead of a selectable PDF.
Step-by-step
- Compress the PDF if it is over ~20MB or a huge scan.
- Open the chat, tap attach (paperclip), and choose “Document” (not “Gallery”).
- Select the PDF and send.
- If the other person needs to copy text, confirm it arrived as a PDF, not a picture.
If it is still too big
- Send via the Document option, never the photo gallery.
- Split a very long scan into a few pages.
- For files over 100MB, compress harder or share a cloud link.
FAQ
Why did my PDF arrive as an image on WhatsApp?
You picked it from the photo gallery. Use the paperclip → Document option to keep it as a real, selectable PDF.
What is the WhatsApp PDF size limit?
100MB when sent as a document. Photos sent from the gallery are compressed to roughly 1MB and lose their text.
My small PDF still will not send — why?
Likely a weak connection or a send-method issue, not size. Re-send via Document and check your network.