How to Compress a PDF for Email
Most email providers cap attachments somewhere between 20 and 25MB, and a lot of everyday PDFs, especially scanned ones, blow past that limit without the sender realizing it until the email bounces.
Check your actual limit first
Attachment limits vary by provider and sometimes by the recipient's mailbox settings too, not just your own. If you're not sure, aim conservatively for under 10MB, which comfortably clears almost every provider's limit including ones with unusually strict settings.
Compressing before sending
Run your file through a compression tool set to a medium compression level as a starting point, which usually cuts file size significantly while keeping text and images clearly legible. Check the resulting file size and only step up to a higher compression level if it's still too large.
When compression alone isn't enough
If a single PDF is genuinely too large even after compression, like a lengthy document full of high-resolution scans, consider splitting it into two smaller files and sending them separately, or uploading it to a cloud storage link instead of attaching it directly.
Compressing multiple attachments at once
If you're sending several PDFs together, remember that email limits typically apply to the total size of all attachments combined, not each file individually. Compress every file in the batch, not just the largest one, since several medium-sized files can add up to more than the limit just as easily as one large file can.
