How to Reduce PDF File Size for Email and Uploads
Most email providers cap attachments around 20–25 MB, and many application portals are stricter still. Here is how to get under the limit in a sensible order.
Step 1: remove pages you do not need
The cheapest byte is the one you never send. Blank scanner pages, duplicate cover sheets and unrequested appendices go first. Delete PDF Pages handles this in seconds.
Step 2: optimise the structure
Run the file through Compress PDF. This is lossless — the page looks identical — and it clears out the accumulated overhead of repeated editing.
Step 3: address the images
If the file is still too large, images are the cause. Re-export from the source at 150 DPI for screen use or 300 DPI for print. If the PDF was built from photos, rebuild it from downsized images.
Step 4: split instead of squeezing
Sometimes the right answer is two files. Splitting a 60 MB scan into three parts is faster than degrading all of it, and recipients often prefer the smaller pieces anyway.
Step 5: link rather than attach
For anything above about 20 MB, share a link from your cloud storage. It avoids bounced mail entirely and lets you replace the file later without resending.
Frequently asked questions
Does zipping a PDF help?
Rarely. PDF content is already compressed, so a ZIP usually saves only a few percent.
Why does the same document differ in size between apps?
Different producers embed fonts and images differently, and some leave far more structural overhead behind.