Optimize 4 min read8 August 2026
How to Compress a PDF for Email Attachments
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Use PDF Mate's Compress PDF tool directly in your browser.
Email Attachment Size Limits
Gmail limits attachments to 25 MB, Outlook to 20 MB, and many corporate email systems to 10 MB or less. If your PDF exceeds these limits, it either bounces back or the client forces you to use a file sharing link instead.
How Much Can You Compress a PDF?
It depends on the content. A PDF full of high-resolution photos can often be reduced by 70–80%. A text-heavy PDF might only compress 20–30%. The Compress PDF tool shows you the output file size before you download so you know exactly what you're getting.
Step-by-Step: Compress for Email
- Open the Compress PDF tool.
- Upload your PDF.
- Try Standard compression first — it reduces size while keeping quality acceptable for most purposes.
- If the result is still too large, try Strong compression.
- Download and attach to your email.
Other Ways to Reduce PDF Size
- Remove unused pages with the Remove Pages tool before compressing.
- Split the PDF and send in multiple emails if a single file absolutely cannot be compressed enough.
- Use a cloud link — upload to Google Drive or Dropbox and share the link instead of an attachment.