Compress PDF for Email Attachments
Gmail, Outlook & Corporate (2026)
Your PDF attachment was rejected. Or you're worried the recipient's inbox will flag it as too large. Email servers have attachment limits that haven't changed much in years — and PDFs regularly exceed them. Here's exactly how to fix it.
Email Attachment Limits by Provider
| Email Provider | Attachment Limit | What Happens If Exceeded |
|---|---|---|
| Gmail | 25 MB total per email | Google automatically converts to a Drive link |
| Outlook.com / Hotmail | 20 MB total per email | Email is rejected with an error message |
| Microsoft 365 (business) | 25 MB by default (admin-configurable up to 150 MB) | Bounced with NDR error |
| Yahoo Mail | 25 MB total per email | Upload fails before sending |
| Apple Mail (iCloud) | 20 MB (Mail Drop for larger) | Prompts to use Mail Drop link instead |
| Corporate email (typical) | 10 MB (conservative) to 25 MB | Varies — often bounced with a cryptic error |
| Government email (Malaysia) | 10 MB typical | Often rejected silently or bounced |
If you attach three PDFs that are each 8MB, the total is 24MB — which clears Gmail's 25MB limit but may trip Outlook's 20MB limit. The limit applies to the entire email including all attachments, not each file individually. When sending multiple PDFs, consider merging them first with the Merge PDF tool, then compressing the merged file.
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Compress PDF Free →How to Compress a PDF for Email
Check your current file size
Before compressing, check the PDF's current size. On Windows: right-click → Properties. On Mac: right-click → Get Info. On mobile: long-press the file. This tells you how much reduction you actually need.
Open ShrinkPDF
Go to shrinkpdf.fyi in your browser. Works on any device — phone, tablet, laptop. Your PDF is processed locally and never uploaded to any server.
Select the right compression level
See the section below for which level to choose based on your email provider and document type.
Download and send
After compression, check the result size shown on screen. If it's under your email provider's limit, download and attach to your email. The entire process typically takes under a minute.
Which Compression Level for Email?
| Document Type | Recommended Level | Typical Result |
|---|---|---|
| Resume / CV | Balanced | 3–8 MB → 0.5–2 MB |
| Contract / agreement (text-heavy) | Light | Modest reduction, preserves legibility |
| Invoice / receipt | Balanced | 1–5 MB → 0.2–1 MB |
| Scanned document | Maximum | 5–20 MB → 0.5–3 MB |
| Presentation / report with images | Balanced | 10–50 MB → 2–10 MB |
| Canva or design export | Maximum | 8–30 MB → 1–4 MB |
| Brochure / marketing material | Balanced | Reduces size while keeping images sharp |
Even though Gmail allows 25MB, the recipient's email server may have a lower limit — especially corporate and government accounts. As a rule, keep email PDF attachments under 10MB to reliably clear any recipient's inbox. Under 5MB is better for very formal or official submissions.
When Compression Isn't Enough
If your PDF is still too large after Maximum compression, here are the alternatives:
- Upload to Google Drive and share a link. Gmail integrates Drive — you can insert a Drive link directly from the compose window. The recipient gets access without any size limitation.
- Split the document. If you're sending a multi-page report, use the Split PDF tool to send only the pages the recipient needs.
- Use WeTransfer or Dropbox. Both allow you to share a download link for free. WeTransfer allows up to 2GB per transfer on the free plan.
- Ask to receive the document in person or via USB. For very large technical documents, sometimes a physical handoff is the right answer.