PDF Too Large to Email? 3 Ways to Shrink It

First, know your enemy: why the email bounced

Email was never designed for large files. Attachments are re-encoded for transport in a way that inflates them by about a third — so a 20 MB PDF becomes ~27 MB on the wire and bounces off a 25 MB limit. And the size itself almost always comes from images: scans, photos, and screenshots embedded in the document. That is good news, because images compress well.

Way 1: Compress the PDF

The fastest fix. A PDF compressor re-encodes the images inside your file at a more efficient size while leaving text and layout untouched. With the Compress PDF tool you drop in the file, pick a level, and download the result:

• High Quality — modest savings, images essentially indistinguishable from the original. Right for portfolios and print-bound documents.
• Balanced — the sweet spot for email: significant savings with images that still look clean on screen.
• Extreme — maximum shrinkage for when the deadline matters more than image finesse.

Scanned documents routinely shrink by half or more. And because the compression runs in your browser, the report you're emailing never travels anywhere before you actually send it.

Way 2: Split it into smaller parts

When a document is huge because it is genuinely long — a 300-page appendix, a year of statements — compression alone may not get you under the limit. Splitting will. The Split PDF tool divides the file at page ranges you choose: type 1-100, 101-200, 201-300 and you get three sequential PDFs, each small enough to attach to its own email.

Number the emails (“Part 1 of 3”) and the recipient can merge the parts back together on their side in seconds — also without uploading anything.

Way 3: Send only the pages that matter

Often the honest fix is editorial, not technical: the recipient needs page 4 and the signature page, not the whole 80-page agreement. Use Split PDF with a custom range like 4, 78-80 to extract exactly those pages into a lean document. Smaller for you, and far friendlier for the person on the other end.

Which way should you pick?

• Scanned or image-heavy file? Compress first — the savings are usually dramatic.
• Genuinely long document that must arrive complete? Split into parts.
• Recipient only needs a few pages? Extract just those.

The three combine well, too: extract the chapters that matter, compress the result, and what began as a 60 MB bounce often ends as a 3 MB attachment that sails through.