How to Make a PDF Smaller for Email (Under 10MB Fast)
Reduce PDF file size to send by email. Get large PDFs under Gmail and Outlook attachment limits — free, takes under 30 seconds.
Email Attachment Size Limits
Every email provider has an attachment limit:
| Email service | Attachment limit |
|---|---|
| Gmail | 25 MB |
| Outlook / Hotmail | 20 MB |
| Yahoo Mail | 25 MB |
| iCloud Mail | 20 MB |
| Corporate email | Often 10 MB or less |
If your PDF is over these limits, it bounces back or fails to send. The fix is quick.
The Fastest Way to Reduce PDF Size for Email
1. Go to Breklo's Compress PDF tool
2. Upload your PDF
3. Select Medium compression
4. Click Compress PDF
5. Download and send
Medium compression reduces most PDFs by 40–60% in about 10–30 seconds depending on file size. A 30 MB PDF typically becomes 10–15 MB.
What If Medium Is Not Enough?
Try High compression. It re-renders each page at lower quality and typically achieves 60–80% reduction. A 30 MB PDF usually becomes 6–10 MB on High.
Note: High compression converts pages to images, so text will no longer be selectable in the resulting PDF.
Alternative: Split the PDF
If compressing is not enough, split the PDF into sections and send them as separate emails. A 60 MB PDF split into three 20 MB parts gets under most email limits.
Alternative: Share via Cloud
For very large files, consider uploading to Google Drive or Dropbox and sharing a link instead of an attachment. This avoids size limits entirely.
Checking File Size on Windows and Mac
Windows: Right-click the PDF → Properties → check Size.
Mac: Click the file once → press Cmd+I → check Size.
After compressing, check the new file size before sending to confirm it is under the limit.
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Frequently asked questions
What is the attachment limit for Gmail?
Gmail allows attachments up to 25 MB. For files larger than 25 MB, Gmail automatically converts them to a Google Drive link.
How do I compress a PDF to under 1MB?
Use High compression on Breklo. For most PDFs this achieves 60–80% reduction. A 5 MB PDF typically becomes 1–2 MB. For very large PDFs, you may also need to split them first.
How long does it take to compress a PDF online?
Basic compression is nearly instant. Medium compression takes 5–30 seconds depending on page count. High compression (which re-renders pages) takes 10–60 seconds for a typical document.
Will compressing a PDF affect the digital signature?
Yes. Compression modifies the file structure, which invalidates digital signatures. Remove any signatures before compressing, then re-sign after.
Why does my compressed PDF still look good?
Medium compression uses 72% quality rendering, which looks fine on screens and in standard print. The reduction in file size comes from lower image resolution and more efficient encoding.
Can I compress a PDF on my phone to send by email?
Yes. Open Breklo in any mobile browser, upload the PDF, compress it, and download. Then attach the compressed PDF to your email.