How to Compress PDF for Email

Gmail: 25MB per email. Files over 25MB are automatically uploaded to Google Drive with a link in the email.

Outlook.com: 20MB per email. Files over 20MB are uploaded to OneDrive with a link.

Yahoo Mail: 25MB per email.

Apple iCloud Mail: 20MB per email.

Corporate email (Exchange): Often 10MB or even 5MB. Check with your IT team.

For most personal email, 25MB is the limit. For corporate email, assume 10MB to be safe.

Open the Compress PDF tool in your browser.

Upload your PDF.

Start with Recommended compression. This reduces file size by 60-80% with no visible quality loss.

Check the resulting file size. If it's under your email limit (25MB for Gmail, 10MB for corporate), download and attach to your email.

If the file is still too large, switch to Strong compression. This reduces file size by 85-95% but may slightly soften images.

If Strong compression still doesn't get you under the limit, split the PDF into smaller parts using the Split PDF tool, and send each part in a separate email.

For PDFs over 25MB that you don't want to compress (or that can't be compressed enough), use a file-sharing service instead of email attachment.

Google Drive: Upload the PDF, right-click, choose 'Get link', set sharing to 'Anyone with the link', and paste the link in your email. Free up to 15GB.

Dropbox: Upload the PDF, click 'Share', copy the link, paste in your email. Free up to 2GB.

WeTransfer: Free for files up to 2GB. Upload, enter recipient's email, and WeTransfer sends a download link. Files auto-delete after 7 days.

OneDrive: Upload the PDF, click 'Share', copy the link, paste in your email. Free up to 5GB with a Microsoft account.

This approach gives you no size limit, no quality reduction, and you can track when the recipient downloads the file.

Compress before attaching. Don't rely on email providers to compress — they often don't, or they do it poorly. Use the Compress PDF tool first.

Use JPG instead of PNG for images inside the PDF. JPGs are much smaller for photographic content, which means smaller PDFs.

Remove unnecessary pages. Use the Split PDF tool to extract only the relevant pages before attaching. A 5-page excerpt is more email-friendly than a 50-page full document.

Consider the recipient's connection. If they're on slow mobile data (common in Pakistan, India, and rural areas), a 25MB attachment takes a long time to download. Aim for under 5MB when possible.

Name your file descriptively. 'Q3-2025-Financial-Report.pdf' is better than 'document.pdf'. This helps the recipient identify the file in their inbox.