How to Send a Large PDF by Email

An "attachment too large" message always seems to arrive at the worst moment. Fortunately, there is a clear order of steps that solves the problem in most cases without reducing the usefulness of your document.

Know the limit

Many email services cap attachments at around 20 to 25 MB. There is a catch: attachments are encoded for transport, which makes them about a third bigger than the original file. A 20 MB PDF can therefore be refused by a 25 MB limit. As a rule of thumb, aim to stay under 15 MB. The receiving mailbox may have its own, lower limit too.

Option 1: compress the PDF

Image-heavy files shrink a lot. Open Compress PDF, choose a balanced setting, and compare sizes. Read How to Compress a PDF Without Losing Quality for guidance on which level to choose.

Option 2: send only the pages that matter

Does the recipient really need all 80 pages? If they only need chapter three, or the signature page, use Extract Pages to create a smaller PDF. If a few pages are unnecessary, Remove Pages deletes them quickly.

Option 3: split the file into parts

If everything is needed, split the document into two or three parts and send them in separate emails. Split PDF can cut by page range or every set number of pages. Name the parts clearly, for example Report-part-1-of-3.pdf, so the recipient can put them back together.

Option 4: share a link instead

For truly large files, upload to a cloud storage service you already use and send a link. This avoids size limits entirely. Remember to check the sharing permissions so that only the intended people can open the file.

Option 5: reduce the source

If you created the PDF yourself, go back to the original document and export again with a smaller preset, or shrink large photos first. This often gives better quality than compressing afterwards.

Before you hit send

• Open the final file and check that it is readable.
• Use a descriptive file name.
• Mention in the email how many pages the attachment has, so the recipient knows nothing is missing.
• Keep the original, uncompressed version for your records.