Email file size limits
Attachment limits depend on the service and even on the app. 20 MB fits Gmail, Outlook.com and the Outlook desktop app, so it is the safe target when you don't know what the recipient uses.
Tools for Email
Guides
Every Email limit
| What | Official limit | Source |
|---|---|---|
| Gmail, personal | 25 MB total per emailOver the limit, Gmail swaps the file for a Google Drive link. | support.google.com |
| Outlook.com | 25 MB per file | support.microsoft.com |
| Outlook desktop app | 20 MB total for Outlook.com, Gmail and other internet accounts | learn.microsoft.com |
| Microsoft 365 work accounts | 35 MB per message by defaultYour admin can change it. Includes about 33% encoding overhead. | learn.microsoft.com |
Limits verified Oct 2, 2026 against official sources.
Report an outdated limitNot officially published: Gmail receiving limit for personal accounts. We don't guess these.