Standard Email Provider Attachment Limits.
| Document | Format & Size |
|---|---|
| Gmail (Google Workspace) | 25 MB Max Attachment Limit |
| Outlook / Microsoft 365 | 20 MB Max Attachment Limit |
| Yahoo Mail | 25 MB Max Attachment Limit |
| Apple Mail (iCloud Mail) | 20 MB Max Attachment Limit |
| Corporate / Enterprise Mail Servers | Commonly 10 MB – 15 MB Ceiling |
Last verified: August 2026
Bypass email bounce-backs and recipient mailbox limits.
Sending PDFs larger than 10–20 MB over email often results in annoying bounce notifications like 'Message size exceeds recipient gateway limit' or forces attachments into external cloud drive links.
Zcompressor optimizes your PDF document streams locally, shrinking file size by up to 80% so your attachments send instantly directly inside standard email messages.
Your files stay on your device.
Your sensitive email attachments and corporate files are processed locally inside your browser.
Frequently Asked Questions.
Keeping your PDF under 5 MB to 10 MB ensures it delivers quickly and reliably across all corporate and webmail providers without triggering recipient spam filters or attachment caps.