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The 32 MB portfolio that would not send

It is Friday afternoon and Petra, a freelance graphic designer, is sending petra-portfolio-2026.pdf, 32 MB of client work, to a new customer through Gmail. She presses Send, and a minute later the message comes back undelivered: attachment too large. The file opens perfectly on her machine. Nothing is wrong with it except its weight, and Gmail counts every byte of the message, not just the file.

Her way out is one of three moves, in this order. Shrink the PDF to a target comfortably under the ceiling. If it still will not fit without turning to mush, split it into parts that each fit. And past about twenty megabytes, or when several documents travel together, stop attaching entirely and send a link the recipient clicks instead.

One more thing inflates the problem before any fix: attachments are re-encoded for transport, which swells them by roughly a third on the wire. A 24 MB file on disk travels as about 32 MB of message, so a file that looks safely inside a 25 MB ceiling can still bounce. Whatever the provider allows, aim well under it.

Know the ceiling before you fight it

Every provider publishes its own message limit, and the receiving server enforces its own too, which can be stricter than yours. These are the published numbers that matter.

The pattern is simple: 5 MB survives practically any mailbox on earth, 10 MB is comfortable between big webmail providers, and anything near the raw ceiling wants a margin for the encoding overhead. When the recipient's provider is unknown, assume the strictest case.

Fix one: shrink to a target

1. Open the email-size tool, which starts with a 5 MB target ready.
2. Drop your PDF onto the page; it opens locally in the tab, nothing uploads.
3. Adjust the target when you know the mailbox: 5 MB for unknown recipients, 10 MB for Gmail to Gmail.
4. Press Compress, check the finished size against the ceiling, and attach the download.

The tool works on what actually takes the space, images, scans and embedded fonts, and reads every candidate back before offering it, so the text stays selectable instead of becoming a picture. When the verdict lands above your target, that reported number is the truth to plan from: either it fits a roomier mailbox, or the file moves on to fix two.

Fix two and three: split, or send a link

When shrinking alone cannot reach the target without hurting readability, stop squeezing and cut instead. Split the PDF into ranges that each fit the ceiling, a 60 MB report travels fine as four readable 15 MB parts, while the same report crushed into one blurry file serves nobody. Often the heavy pages are an appendix of scans nobody asked for: pull out only the pages the recipient needs and send ten pages instead of two hundred.

Past about twenty megabytes, or past three or four documents in one message, a link beats every attachment. It also lets you replace the file later without sending a correction, which attachments never allow. Every provider already built this path: Gmail offers a Drive link, Outlook offers OneDrive, Apple Mail offers Mail Drop. The link sharing guide covers the free places to host a file and what each one reveals about you and the people who open it.

Mistakes that keep the bounce coming

Zipping the PDF. The pictures and text streams inside a PDF are already compressed, so a zip saves almost nothing, and some corporate servers block zip attachments outright. Shrink to a target instead.

Aiming exactly at the ceiling. A 25 MB target against a 25 MB limit forgets the encoding overhead and the message text around the file. Aim for 18 to 20 MB at most, lower when the recipient is unknown.

Forgetting the other end. Your Gmail can send 25 MB, but the client's corporate server may accept 10. When mail to one address keeps bouncing while everything else goes through, their server is the ceiling that matters.

Attaching the original after shrinking. The download has a new name in the downloads folder while the mail draft still holds the old heavy file. Swap the attachment before pressing Send.

Sending one giant file when ten pages would do. Recipients rarely need the whole report. Extract the pages that matter and watch the problem shrink with the file.

When email is the wrong envelope

Some files should never travel as attachments at all. Contracts with personal data, medical reports, anything a curious mail server has no business storing in plain text: these deserve a password and a safer channel. Lock the PDF with a password first, share the password by a different route than the file, and prefer a link you can revoke over an attachment you cannot.

Workplace rules can also overrule every fix here. When your employer or client contract names approved software for documents, use that software and ask IT for the sanctioned way to send large files; convenience never beats policy.

And when the recipient is reachable, the simplest fix is a question. A client who expects a 30 MB portfolio will usually reply with their preferred way to receive it: a shared folder, an upload link, a second message. Asking takes one short email; fighting the ceiling alone takes an afternoon.