How-To4 min readJune 10, 2025

How to Compress a PDF for Email (Without Losing Quality)

Most email providers cap attachments at 20–25MB. Learn how to compress your PDF to send it as an email attachment — without making it look blurry.

The Problem: Your PDF is Too Big to Email

Gmail caps attachments at 25MB. Outlook limits you to 20MB. If your PDF is over that, your email simply won't send.

The good news? Most PDFs — especially ones with scanned pages, photos, or complex graphics — can be compressed by 50–90% without any visible quality loss when reading on screen.

The Right Compression Level for Email

When compressing a PDF specifically for email, use the Recommended compression level. Here's why:

Low compression barely reduces file size — you might go from 18MB to 15MB, which still won't fit.

Recommended hits the sweet spot — downsampling images to 150 DPI. This is invisible on any screen and brings most PDFs under the 5MB mark.

Extreme compression (72 DPI) is a last resort. Text stays sharp, but photos will look noticeably softer. Only use this if Recommended still leaves you above the limit.

Step-by-Step: Compress a PDF for Email

Go to compress-pdf.site

Select Recommended as your compression level

Drag and drop your PDF into the upload zone

The file compresses automatically — no button to click

Download the compressed file

Attach it to your email as normal

That's it. No account needed. The file is auto-deleted from our servers after 1 hour.

What If the File Is Still Too Large?

Try these in order:

Switch to Extreme compression — this should handle most cases.

If the PDF has many pages, consider splitting it into two smaller files and sending them in separate emails.

Use a file transfer service (WeTransfer, Google Drive, Dropbox) and share a link instead of attaching the file directly.

Supported Email Clients

A compressed PDF opens correctly in every major email client — Gmail, Outlook, Apple Mail, Yahoo Mail, and mobile apps on iOS and Android.

How Much Will It Shrink?

It depends on what's inside the PDF:

Content Type	Typical Reduction
Scanned documents (photos)	60–90%
Mixed text + images	40–70%
Pure text / vector	10–30%
Already-optimised PDFs	0–10%

A 20MB scanned contract will typically compress to under 4MB on the Recommended setting — well within email limits.

Ready to try it?

Free PDF compression. No signup. Files deleted after 1 hour.

Compress a PDF now

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