PDF Too Large to Email? 4 Ways to Send It
Gmail and Outlook.com allow about 20–25 MB per email, and many business servers only 10 MB. Either compress the PDF below the limit, split it into parts, or send a share link from Google Drive, OneDrive, iCloud or Dropbox instead of an attachment.
Common attachment limits
| Service | Limit per email |
|---|---|
| Gmail | 25 MB |
| Outlook.com / Hotmail | 20 MB (larger files via OneDrive link) |
| Yahoo Mail | 25 MB |
| iCloud Mail | 20 MB (up to 5 GB with Mail Drop) |
| Corporate Exchange servers | Often 10 MB |
Remember: encoding adds ~33%, so aim for files well below the limit.
Way 1: Compress it
Most oversized PDFs are scans or contain photos and shrink dramatically. Follow How to compress a PDF with the medium setting.
Way 2: Send a link instead
- Gmail: click the Google Drive icon when composing.
- Outlook: attach from OneDrive, or Outlook offers to upload big files automatically.
- Apple Mail: Mail Drop kicks in automatically for large attachments.
- Or upload anywhere (Dropbox, WeTransfer) and paste the link.
Check the sharing setting is “Anyone with the link” if the recipient isn’t in your organisation.
Way 3: Split it
Use a PDF splitter to send “Part 1 of 3”, “Part 2 of 3”… Useful when the recipient’s portal accepts only attachments.
Way 4: Zip it (small help)
ZIP compression helps little on PDFs, because they are already compressed. Expect only 0–10% savings. Only worth it to bundle many files together.
Frequently asked questions
Why does a 20 MB PDF fail when the limit is 25 MB?
Email attachments are encoded (Base64), which adds about 33% to their size. A 20 MB file becomes roughly 27 MB in transit.
What's the maximum I can send with Gmail?
25 MB of attachments per email. Larger files are automatically offered as a Google Drive link.
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