How to Reduce PDF File Size for Email
Practical PDF compression settings for Gmail, Outlook, application portals, and client attachments.
Email services and application portals often reject attachments over 10-25 MB. Reducing a PDF for email is mostly about optimizing images, removing unnecessary data, and choosing a file size that stays comfortably below the limit.
If your PDF contains scanned pages or photos, image compression will usually save the most space. A scanned document at 300 DPI may look good for printing, but 150-200 DPI is often enough for reading on screens and sending by email.
Use balanced compression first. Maximum compression can make signatures, stamps, charts, and small text harder to read. If the file is still too large, reduce page image resolution before lowering quality too aggressively.
Check the final PDF before sending. Open it at 100 percent zoom, inspect pages with small text, and confirm that important visual details such as seals, screenshots, and diagrams remain legible.
For very large files, split the PDF into logical sections instead of forcing harsh compression. Sending a contract and appendices as separate attachments can preserve quality while staying under size limits.