Most mail providers reject attachments above roughly 20 to 25 MB, and some company mail servers stop at 10 MB. If a PDF bounces back or will not attach, the fix is almost always to make the file smaller before you send it.
Why the file is large
In a typical oversized PDF, nearly all of the weight is images: scanned pages, photos, or screenshots embedded at full camera resolution. Plain text and vector graphics add very little. That is why a 40-page contract can be under 1 MB while a 3-page scan can be 15 MB.
Steps
- Open Compress PDF and upload the file.
- Choose Recommended first. Download the result and check that the pages are still clear.
- If it is still too large, repeat with Extreme.
- Still over the limit? Remove pages you do not need to send with Delete PDF Pages, then compress again.
Other ways to get under the limit
- Send only the pages that matter. Use Extract PDF Pages to pull out the relevant pages into a small separate file.
- Send the text instead of the scan. If the recipient only needs the wording, PDF to Text produces a file measured in kilobytes.
- Use a link instead of an attachment. For very large files, share from cloud storage and email the link.
Frequently asked questions
How small should the file be?
Aim for under 10 MB. That clears almost every personal and corporate mail server.
Will compression ruin a scanned contract?
At the Recommended level, scans stay readable and printable. Only the strongest setting produces visible softening, and even then the text is legible.
Is the original file changed?
No. Compression produces a new file, and your upload is deleted automatically soon after.
Start with Compress PDF.