Optimization5 min read2026-08-28

How to Reduce PDF Size for Email Attachments (Gmail 25MB & Outlook 20MB Limits)

Overcome email bounce-backs caused by large PDF attachments. Learn how to compress presentation slides, portfolios, and reports to under 10MB in seconds.

PDFEditor4U Editorial Team

Email & Productivity Specialist

Contents

Attachment Limits by Email Provider
Optimizing PDFs for Lightning-Fast Email Delivery

There is nothing more frustrating than having an urgent email bounce back with the error message: "552 5.3.4 Message size exceeds fixed maximum limit".

Attachment Limits by Email Provider

Gmail / Google Workspace: 25 MB
Microsoft Outlook / Office 365: 20 MB - 25 MB
Yahoo Mail: 25 MB
Corporate Enterprise Inboxes: Frequently restricted to 10 MB or 5 MB

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