Tried to send a PDF only to get a "file size exceeds the limit" error? This common problem is easy to fix with PDF compression. Here's how to get your PDFs under the attachment limit.
Email Attachment Size Limits by Provider
Before compressing, check the attachment limit of the email service you're using.
| Email Provider | Attachment Limit | Notes |
|---|---|---|
| Gmail | 25 MB | Auto-converts to Google Drive link when exceeded |
| Outlook.com | 20 MB | Up to 150 MB with Microsoft 365 |
| Yahoo Mail | 25 MB | Total per message |
| iCloud Mail | 20 MB | Mail Drop supports up to 5 GB |
| Corporate email | 5–10 MB | Often restricted by internal security policies |
How to Compress a PDF to Fit Email Limits
Step 1: Check Your Current File Size
First, find out how large your PDF is.
- Windows: Right-click the file → Properties
- Mac: Select the file → Command + I
- Phone: Open file details in the Files app
Step 2: Set a Target Size
Choose a target size based on the recipient's email limit. For safety, aim for 80% or less of the maximum.
| Recipient's Limit | Target Size |
|---|---|
| 25 MB (Gmail, etc.) | Under 20 MB |
| 20 MB (Outlook, etc.) | Under 16 MB |
| 10 MB (corporate) | Under 8 MB |
| 5 MB (strict policies) | Under 4 MB |
Step 3: Compress with a PDF Tool
Free Tool
PDF Compressor
Reduce PDF file size while preserving quality. Perfect for email attachments and uploads.
Try it now →- Drag and drop your PDF into sakutto's PDF compressor
- Select a compression level (Standard is recommended for email)
- Check the compressed file size
- Download if it meets your target
What to Do If Compression Isn't Enough
Option 1: Split the PDF
For multi-page PDFs, split them into halves and send each in a separate email. Include a note like "Part 1 of 2" so the recipient knows what to expect.
Option 2: Share via Cloud Storage
Upload the file to Google Drive, OneDrive, or Dropbox and paste the sharing link in your email. This is the most common approach for large files.
Option 3: Use a File Transfer Service
Services like WeTransfer let you send large files via a download link. However, some companies block these services for security reasons.
Email Etiquette for PDF Attachments
- Use descriptive file names: Include the document type and date, e.g., "Invoice_CompanyName_20260308.pdf"
- Mention the file size: A note like "Please find the attached document (approx. 3 MB)" is helpful
- Note if compressed: For image-heavy documents, add "File has been compressed for email delivery"
- Request confirmation: For important documents, ask the recipient to confirm receipt
FAQ
Does compression change the content of my PDF?
No. Text content and layout remain unchanged. Compression primarily affects embedded image quality. Standard compression maintains quality suitable for viewing and printing.
Will the recipient have trouble opening a compressed PDF?
No. Compressed PDFs use the standard PDF format and can be opened with any PDF reader, including Adobe Acrobat Reader, web browsers, and Preview on Mac.
Can I compress multiple PDFs at once?
Yes. sakutto's PDF compressor supports batch compression of multiple files. You can compress them all at once and download as a ZIP file.
What's the ideal PDF size for email?
Generally, 3–5 MB or less is ideal. This size works with virtually every email service and downloads quickly for the recipient.
Summary
PDF size issues with email are easy to solve with a compression tool. Check the recipient's attachment limit, compress at the Standard setting, and verify the result. If the file is still too large, consider splitting it or sharing via a cloud storage link.
Free Tool
PDF Compressor
Reduce PDF file size while preserving quality. Perfect for email attachments and uploads.
Try it now →