To receive large PDF files from clients, give each client a channel built for big files, such as an upload link, instead of email, which caps message size at 10 to 25 MB. Ask for one document per file where possible. When a large file arrives, count its pages and open each one before marking anything received.
Why do large PDF files from clients bounce?
Large PDF files from clients bounce because every email service sets a ceiling on how big one message can be. The ceiling covers the whole message, so a scan that is just under the limit can still fail once the email text and any other attachments are added. The client often sees an error the firm never sees.
The published limits are low compared with a scanned year of paperwork. Microsoft's guide to sending large files with Outlook puts the limit at 20 MB for Outlook.com and other internet accounts and 10 MB by default for business Exchange accounts, and says the figure includes the email itself. Google's page on Gmail attachment size limits gives 25 MB for personal accounts and says a workplace administrator sets the limit for work accounts.
A bounce is not the only failure. Gmail's page says an attachment over the limit is removed and replaced by a Google Drive link. The firm then receives a link instead of a file and has to open it, save the document and move it to the client's folder.
Scanner settings cause most oversized files. A client who scans in colour at high resolution, or photographs each page, can turn a short statement into a file many times larger than the same pages saved as a text PDF.
Ways to receive large PDF files without email
The best way to receive large PDF files without email is a channel that has no small message cap and puts the file straight into the right client's folder. An upload link does both. A cloud-storage share link also avoids the cap, but it leaves the file in the client's account until someone at the firm downloads it.
The table below sets the published email limits next to example file sizes. The sizes are illustrations for a fictional client, Example Household, not measurements, and real scans vary widely with the scanner and its settings.
| What the client sends (example) | Example size | Fits Outlook business default (10 MB)? | Fits Gmail personal (25 MB)? | Channel to use |
|---|---|---|---|---|
| Two-page W-2 saved from an employer site | 0.3 MB | Yes | Yes | Email or upload link |
| Twelve monthly bank statements downloaded as PDFs | 4 MB | Yes | Yes | Upload link, one file per month |
| Prior-year return, 60 pages, scanned in colour | 30 MB | No | No | Upload link |
| A year of receipts, 200 pages, phone photos | 150 MB | No | No | Upload link, sent in parts |
Microsoft's guide suggests putting a large file in cloud storage and sending a link, or zipping it. Either route works, but both leave the firm with an extra step: open the link or the archive, save the file, and move it to the client's folder.
An upload link removes that step, because the link belongs to one client. How the link works, and what to tell a client before sending it, is set out in what a client document upload link is. Schema CPA gives every client one such link, and a scanned return, a batch of phone photos and a forwarded email attachment all end up in that client's file.
Should clients compress or split a large PDF before sending?
Clients should split a large PDF before compressing it. Splitting keeps every page at its original quality and only changes how many files there are. Compressing makes each page smaller by lowering image quality, and heavy compression can blur the small print a preparer needs, such as box numbers, account digits and dates.
Compression ruins a scan when the figures stop being legible. A brokerage statement with dense tables, a K-1 with small footnotes, or a faint receipt are the usual casualties. If a client must compress, ask them to open the result and zoom in on a figure before sending it.
Splitting works best along document lines. A 200-page file is easier to check as ten files, each one document or one month, than as ten arbitrary page ranges. Pulling apart a combined PDF by document type after it arrives is covered in the organizing client files category.
The simplest fix is upstream. Ask clients to download statements from their bank or broker as PDFs rather than printing and scanning them. A downloaded statement avoids the scanner settings that inflate file size, and its text stays sharp at any zoom.
Checking a large client PDF arrived complete
Checking that a large client PDF arrived complete means confirming three things: the file opens, the page count matches what the client sent, and every document inside it is readable. A file that opens is not proof. A transfer can stop part way, and a scanner can skip or double-feed pages without any warning.
Start with the page count. Ask the client how many pages they scanned, or compare against the documents themselves: a statement printed "page 4 of 6" tells you two pages should follow. Look for page numbers that jump and for the last page of each statement.
Then read the file, page by page, and list what it holds. A 60-page upload can hold a prior-year return, two brokerage statements and a 1098. Each of those is its own document and belongs on its own line of the client's list. That listing step is where Schema CPA helps most: it reads each page, sorts it by document type, issuer and period, and flags a second copy of something already on file.
Watch for these signs of a damaged or partial file:
- Pages that load blank or grey.
- A statement whose closing balance has no matching final page.
- Two copies of the same page, which suggest a double feed.
- A smaller file size than the client described.
Large uploads are most common at the start of an engagement, when a client sends a whole year at once. For how that fits a household's season, see how to collect documents for a 1040 engagement. Business clients send the largest files of all, often a full ledger and twelve months of statements, which document collection for business tax returns covers. The document types Schema CPA reads are listed on the homepage.