What is the maximum email attachment size?

It depends on your provider. Gmail allows attachments up to 25MB, while Outlook caps most attachments at around 20MB. If your PDF is larger than the limit, the email will not send until you shrink it.

How can I make a PDF small enough to email?

Run it through the PDFEzy Compress PDF tool and pick a compression level until the file drops under your provider's limit. For very large documents, split the PDF first or share it as a download link instead of an attachment.

Is it safe to compress confidential PDFs online?

Yes. PDFEzy compresses your files locally and in your browser using client-side code. Your confidential documents are never uploaded to a server, so they stay private on your own device.

How to Reduce PDF File Size for Email

To reduce a PDF for email, open the PDFEzy Compress PDF tool, upload your file, pick a compression level, and download the smaller version. Shrinking it helps the PDF slip under common attachment limits — 25MB on Gmail and about 20MB on Outlook — with no software to install and no uploads.

Why your PDF won't attach

Email providers cap attachment sizes. Gmail rejects anything over 25MB, and Outlook stops most attachments at around 20MB. A scanned document or image-heavy report can easily blow past those limits.

Compressing the PDF lowers the size of embedded images and removes redundant data, so the same document fits comfortably in an email.

Step-by-step: shrink a PDF to fit your email limit

1. Open the Compress PDF tool

Go to the Compress PDF tool. It loads instantly in any modern browser — Chrome, Edge, Firefox or Safari — with nothing to download.

2. Upload your PDF

Drag and drop your large PDF onto the page, or click to browse and select it from your device.

3. Pick a compression level

Choose how aggressively to compress. Higher compression makes a smaller file with a slight drop in image quality; lighter compression keeps quality but saves less space.

4. Check it fits the limit

Look at the new file size and confirm it lands under your provider's cap — under 25MB for Gmail or under about 20MB for Outlook. Try a stronger level if it is still too big.

5. Download the smaller PDF

Click to download the compressed file, then attach it to your email. The whole process takes seconds and runs on your device.

Practical tips

If a single PDF is still too large even after heavy compression, use the Split PDF tool to break it into smaller parts and send them across a couple of emails.

For very large files, share a download link from cloud storage instead of attaching the PDF. And if you are bundling several documents, the Merge PDF tool can combine them first so you compress one clean file.

Is it private?

Yes. PDFEzy runs entirely in your browser using client-side code, so your files are processed on your own device and never uploaded to a server. When you close the tab, nothing remains.