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PDFがメール送信には大きすぎる?5つの解決方法

「添付ファイルが大きすぎます」エラーを解決。PDFサイズを削減するか大きなファイルを効果的に共有する5つの実証済み方法。

公開日 2026年1月26日

The Email Size Limit Problem

You've crafted the perfect email, attached your PDF, and... error. "Attachment too large." Most email providers have strict limits:

  • Gmail: 25MB
  • Outlook/Hotmail: 20MB
  • Yahoo Mail: 25MB
  • Corporate email: Often 10MB or less

Solution 1: Compress the PDF

The quickest fix is reducing file size. Our Compress PDF tool can significantly shrink your PDF:

  • Extreme compression: Can reduce files by up to 90%
  • Recommended: Good balance of size and quality
  • Light compression: Maintains quality for important documents

Try extreme compression first - if the quality is acceptable, you're done!

Solution 2: Split Into Multiple Parts

For very large documents, splitting the PDF into smaller parts may be the best option:

  • Split by page ranges (e.g., pages 1-20, 21-40)
  • Extract individual chapters or sections
  • Send as multiple attachments in separate emails

Solution 3: Remove Unnecessary Pages

Do you need to send the entire document? Use Remove Pages to:

  • Delete blank pages
  • Remove appendices the recipient doesn't need
  • Extract just the relevant sections

Solution 4: Convert High-Resolution Images

PDFs with many images are often huge. Consider:

  • Reducing image resolution before creating the PDF
  • Converting color images to grayscale if color isn't essential
  • Using compression on individual images

Solution 5: Use Cloud Sharing Instead

When compression isn't enough, share via cloud:

  1. Upload to Google Drive, Dropbox, or OneDrive
  2. Get a shareable link
  3. Email the link instead of the file

Benefits:

  • No size limits
  • Recipients always get the latest version
  • You can revoke access later
  • Track who accessed the file

Prevention: Creating Smaller PDFs

For future documents:

  • Use "Save As" with compression options in PDF software
  • Optimize images before inserting them
  • Avoid embedding fonts if not necessary
  • Use vector graphics instead of high-resolution images when possible

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