How to Reduce PDF Size for Email Attachments

Most email providers cap attachments at 25 MB. Cloud-storage links bypass the limit, but plenty of corporate inboxes still bounce anything bigger. Here are three techniques that always work.

1. Compress the PDF

Run your file through Compress PDF at the medium setting. Most documents shrink by 50–70% with no visible quality loss.

2. Split into smaller pieces

If the PDF is huge because it has hundreds of pages, use Split PDF to break it into chunks the recipient can stitch back together.

3. Convert image-heavy pages

If your PDF is a stack of full-resolution photos, the size will be enormous. Re-export the images as JPG (lossy compression handles photos beautifully), then rebuild the PDF with JPG to PDF.

Email-friendly target sizes

• Gmail / Outlook: <25 MB
• Corporate inboxes: often <10 MB
• Mobile data senders: aim for <2 MB

If your file still won't fit, share via a cloud link instead — but always include a short description of the contents in the email body so the recipient knows what they're clicking.