How to Reduce PDF Size for Email Attachments (Free)

You've written the email, attached the PDF — and then you see the error: 'Attachment too large'. Gmail caps attachments at 25MB, Outlook at 20MB, and many company email servers at 10MB or even 5MB. Here's how to fix it in under a minute.

Email Provider Attachment Limits

• ✓Gmail: 25MB per email
• ✓Outlook / Hotmail: 20MB per email
• ✓Yahoo Mail: 25MB per email
• ✓Corporate email servers: often 10MB or less
• ✓WhatsApp documents: 100MB (rarely an issue)

How to Reduce PDF Size for Email — Step by Step

1. 1
   Open the Compress PDF tool

   Go to pdfvista.com/compress-pdf. No account needed.
2. 2
   Upload your PDF

   Select your PDF file. The tool shows you the current file size.
3. 3
   Select compression level

   For email: choose 'Medium (50%)' for a good balance of size and quality. If still too large, use 'High (75%)' or 'Maximum (100%)'.
4. 4
   Download and attach

   The tool shows original vs compressed size. Download and attach the smaller file to your email.

Which Compression Level Should I Use?

• ✓Light (25%): Minor reduction — use when quality is critical (e.g. portfolios, photography).
• ✓Medium (50%): Best for most business documents — contracts, reports, presentations.
• ✓High (75%): For forms, applications, and scanned documents where readability matters more than image quality.
• ✓Maximum (100%): Smallest possible file — use when you just need the content to be readable.

Frequently Asked Questions