What to Do When You Hit Gmail or Outlook's Email Attachment Size Limit

Two simple routes to take, without panicking, when you hit the 25 MB wall.

Summary

Services like Gmail and Outlook typically cap email attachments at around 20-25 MB. When a PDF or image goes over that limit, you have two options: compress the file to bring it under the cap, or share a cloud storage link instead.

Step by step

First check the file's actual size and how far over the limit it is.
If it's a PDF, try shrinking it with a browser-based compression tool — the images inside are usually what's taking up the space.
If you have multiple files, try zipping them together first, then compressing.
If compression isn't enough, upload the file to a cloud storage service and just paste the link into the email instead.

Why it matters

Attachment limits tend to bite at the worst moment: a deadline, a client proposal, month-end paperwork for your accountant. And your own email service isn't the only one setting the limit. If the recipient's service has a lower cap, the message can leave your outbox and still bounce back later. Knowing your options ahead of time takes the pressure off.

Details worth knowing

Attachments are encoded as text when they're sent, which makes them roughly a third larger. A file just under the limit can still be rejected.
The limit usually applies to the whole message, not to each file.
On company email, an administrator may have set a different cap.
Some services automatically upload large attachments to their own cloud storage and send a link instead. The recipient sees a link, not an attachment.

Common mistakes

Photographing documents at full phone resolution before turning them into a PDF. Far lower resolution is enough to stay readable.
Splitting a file across several emails and expecting the recipient to stitch it back together.
Not checking the sharing permissions on a cloud link, so the recipient hits a "request access" page.
Sending sensitive documents through a public link and leaving it open forever.

A sample scenario

A freelancer wants to send a full year of invoices and bank receipts to their accountant. Merged into one PDF, it's far over the limit. Compressing the scanned images shrinks it a lot, but not enough. So they split the documents into two files, six months each, send two emails, and note in each subject line which period it covers. It's easier for the accountant to file, too.

When you need a different approach

If your team regularly sends and receives large files, a shared cloud folder or a proper file transfer system will hold up better than compressing every time. For files containing personal data, check with your IT or compliance team about which method is acceptable.