How to compress a PDF for email
Last updated: April 2026 · Reading time: 3 minutes
Email providers cap attachments at 20–25 MB. If your PDF is larger, the message bounces or forces you into a cloud link. Compressing the PDF below 25 MB usually takes under a minute with the right tool. Here's how to do it without installing anything, creating an account, or adding a watermark.
Step-by-step
- 1
Open the PDFree compress tool in your browser at pdfree.app/en/tools/compress.
- 2
Drop your PDF file into the upload area, or click to select it from your computer.
- 3
Choose a compression level: High (smallest size, lower quality), Medium (balanced), or Low (best quality, larger size).
- 4
Wait 5–30 seconds while the file is processed on a secure server.
- 5
Download the compressed PDF. The file is automatically deleted from the server immediately after processing.
Email attachment limits by provider
| Provider | Max attachment size |
|---|---|
| Gmail | 25 MB |
| Outlook.com | 20 MB |
| Yahoo Mail | 25 MB |
| iCloud Mail | 20 MB |
| ProtonMail (free) | 25 MB |
Frequently asked questions
What's the maximum email attachment size?
Gmail caps attachments at 25 MB, Outlook.com at 20 MB, Yahoo Mail at 25 MB, iCloud Mail at 20 MB. If you exceed the limit, most providers auto-suggest a cloud link instead — but for client-friendly delivery, compressing the PDF below 25 MB is more reliable.
How much can I compress a PDF without losing quality?
Typical compression ratios are 30–80% depending on content. PDFs with embedded images compress more (50–80%); PDFs with mostly text compress less (10–30%). PDFree's Medium setting preserves visible quality for most documents while cutting file size in half.
Is it safe to compress sensitive PDFs online?
PDFree's compress tool runs server-side, but files are processed in memory only and deleted immediately after the download is delivered. We do not log file contents, do not retain copies, and use HTTPS in transit. For maximum privacy with sensitive documents, you can also use desktop tools or PDFree's client-side tools (rotate, sign, redact) which never upload at all.
Why is my compressed PDF still over 25 MB?
If your PDF contains high-resolution scanned images at 300 DPI or higher, compression alone may not be enough. Try the High compression level, or split the PDF into smaller files using PDFree's split tool and send them as separate emails.