Email attachment limits in 2026
| Provider | Attachment limit | Practical ceiling* |
|---|---|---|
| Gmail | 25 MB | ~18 MB |
| Outlook / Office 365 | 20 MB | ~15 MB |
| iCloud Mail | 20 MB | ~15 MB |
| Yahoo Mail | 25 MB | ~18 MB |
| Corporate servers | often 10 MB | ~7 MB |
*Attachments are Base64-encoded in transit, which inflates them by ~33% — that's why a “24 MB” file can still bounce from Gmail.
The one-minute fix
- Drop your PDF into the tool above (any size — even 200 MB+).
- Keep the Strong preset. It's tuned exactly for email: sharp on screen, tiny on disk.
- Download and attach. A 200 MB deck typically lands at 4–7 MB — safely under every limit in the table.
Why not just send a Drive link?
Sometimes a link is fine. But links get blocked by corporate filters, require permission juggling, expire, and die when you move the file. An attachment under 10 MB works everywhere, forever, with zero friction for the recipient — which is what you want when the recipient is a client.
FAQ
What are the attachment limits of major email providers?
Gmail and Yahoo: 25 MB. Outlook/Office 365 and iCloud Mail: 20 MB. Corporate mail servers are often stricter — 10 MB is common. Note the limit applies to the encoded message, so the real ceiling is about 30% lower than the number.
Which preset should I use to get under 25 MB?
Start with Strong (110 DPI). A typical 100–300 MB presentation lands at 3–10 MB — far below any limit, with quality that's perfectly fine for reading on screen.
Isn't a cloud link (Drive/Dropbox) easier?
Links have downsides: recipients need access permissions, corporate filters often block them, files expire, and forwarding breaks. A small attachment just works — in every mail client, forever.
Will the recipient notice the compression?
On screen, almost never. The pages are re-rendered at 110–200 DPI, which matches or exceeds normal display resolution. Text stays sharp because vector-accurate rendering happens before compression.