How to Reduce PDF Size for Email Attachments

You've finished your report, saved it as a PDF, and gone to attach it to an email — only to find it's 35MB and your provider won't send it. Sound familiar? Here's how to solve this problem quickly and for free.

Email Attachment Size Limits by Provider

Every major email provider enforces a maximum attachment size. Here's what you're working with:

• Gmail: 25MB per email (attachments larger than this must be sent via Google Drive)
• Outlook / Hotmail: 20MB per email
• Yahoo Mail: 25MB per email
• Apple Mail (iCloud): 20MB (larger files sent via Mail Drop)
• Corporate email servers: Often 10MB or less — check with your IT department

Keep in mind that the attachment size limit applies to the entire email, not just one file. If you're attaching multiple files, the total must stay under the limit.

The Fastest Way to Compress a PDF for Email

The quickest solution is to use a free online PDF compressor. Here's how to do it with compress-pdf.cc in under a minute:

1. Visit compress-pdf.cc in your browser.
2. Drop your PDF onto the upload area or click to select it.
3. Select Maximum compression for the smallest possible file size.
4. Click "Compress PDF" and download the result.
5. Check the new file size — if it's under your email provider's limit, you're done.

What File Size Should I Aim For?

As a general rule, aim to keep email attachments under 10MB even if your provider allows 25MB. Why? Because the recipient's email server also has its own limits, and a large attachment takes longer to upload, send, and download on mobile connections.

• Under 5MB: Ideal — opens almost instantly on any device or connection
• 5–10MB: Acceptable for most professional contexts
• 10–20MB: Fine if you know the recipient's setup supports it
• Over 20MB: Use a cloud link instead (see alternatives below)

Alternatives When Compression Isn't Enough

Sometimes a PDF is simply too large to email, even after compression. Here are the best alternatives:

• Google Drive / Dropbox / OneDrive: Upload the PDF and share a link. Recipients can view it in their browser or download it — no size limits.
• WeTransfer: Free for files up to 2GB. Upload and share via a download link that expires after a few days.
• Split the PDF: If the document can be divided into sections (e.g. chapters), split it into smaller files and send as separate emails or a ZIP archive.
• Convert to a smaller format: For simple text-heavy documents, consider whether a Word or plain text file would serve the same purpose at a fraction of the size.