The Best Way to Send a Large PDF When Email Says 'File Too Big'

Start with the limit, not the tool

Find the file size first. On most devices, right-click or long-press the file and check its properties. Then compare it with the limit of the service you are sending through: Gmail 25MB, Outlook.com 25MB, Yahoo 25MB, and iCloud 20MB. If you are sending to someone and you do not know their service, plan for 20MB. A file at 24MB may pass Gmail but fail if the recipient uses iCloud, and a file close to any limit can still bounce once message overhead is added.

Step 1: Compress first

Open the Compress PDF tool and compress the file. This works best when the PDF contains scanned pages or photographs, because the tool recompresses embedded JPEG images. It does not help much with text-only PDFs: a report made of typed text has almost no image data to recompress, so it will barely shrink. That is normal, not a fault in the file. If compression brings the file under the limit, you are done — send the single compressed file.

Step 2: Split into parts under the limit

If the file is still too big, split it by page ranges into parts that each fit under the limit. PaperKit Split PDF has no split-by-size mode and no target-size option, so you estimate pages per part from the total size divided by the page count, split, and then check each part. Send the parts in order, clearly labelled Part 1, Part 2, and so on, and tell the recipient how many parts to expect so a missing part is noticed at once. The recipient can merge the parts back into one file with the Merge PDF tool if they need a single document.

Step 3: Link sharing when neither step is enough

Sometimes neither step fits the job: a single scanned certificate that must stay in one piece, or a file so large that splitting would create a dozen parts. In that case, sharing a download link is the honest fallback. Use a storage service you already trust, share the link only with the intended recipient, and confirm the permissions before you send it. Link sharing is not a PaperKit feature, but it is the practical answer when email itself is the bottleneck.

What not to do

Do not rename a PDF to another extension to sneak it past a limit, do not send a password-protected file and assume the recipient can open it, and do not keep recompressing the same file expecting a different result. If compression barely changed a text-heavy file the first time, it will barely change it the second time. Split the file or share a link instead. Also remember that no PaperKit tool bypasses a password: unlock a protected file in the application that created it first.

For the full method, including the arithmetic for estimating pages per part, see How to Split a PDF by File Size So Each Part Fits an Email, and for the causes of large files, see Why Is My PDF So Big? 5 Causes and the Fix for Each. The pillar guide How to Send PDF Files Anywhere: Email Limits, Sharing and Fixes covers the whole topic.