Email attachment limits to know
- Gmail: 25 MB total per message (compressed PDFs should target under 10 MB to be safe).
- Outlook (Microsoft 365): 20–25 MB per message depending on settings.
- Many corporate inboxes block anything above 10 MB.
Business documents
How to Compress a PDF for Email
By MyPDFKitty Editorial Team · Updated 2026-01-08
Quick answer
To compress a PDF for email, upload it to MyPDFKitty's Compress PDF tool. Aim for a final size under 10 MB for Gmail and 20 MB for Outlook so it goes through reliably.
Step-by-step
- Step 1
Open Compress PDF
Go to the Compress PDF tool.
- Step 2
Upload your file
Drop the PDF you need to email.
- Step 3
Download & attach
Save the smaller file and attach it to your email.
Related tools
Keep reading
PDF editing
How to Compress a PDF Online
Learn how to compress a PDF online, reduce file size, and make PDFs easier to email or upload using MyPDFKitty.
FAQ
What's the safest target size?+
Under 10 MB will work almost everywhere.
What if it's still too big?+
Split the PDF and email in parts, or share a download link.
Try it now
To compress a PDF for email, upload it to MyPDFKitty's Compress PDF tool.