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Merge PDF Files for Email Attachments

Combine multiple PDFs into one file before sending via email

Direct tool access Query-specific guide Free to run. No card.

Why merge PDF Files for Email Attachments?

Email clients like Gmail (25 MB) and Outlook (20 MB) limit attachment sizes and count. Merging multiple PDFs into a single document keeps your emails professional, organized, and under size limits. Instead of attaching 5 separate files, send one clean PDF.

How to merge PDF Files for Email Attachments — Step by Step

Check the input requirements, follow the steps below, and open the tool when you are ready.

  1. 1

    Upload all the PDF files you want to email

  2. 2

    Drag to arrange them in the right order

  3. 3

    Click 'Merge PDFs' to combine into one file

  4. 4

    Download the merged PDF and attach to your email

Frequently Asked Questions

What's the maximum file size for Gmail attachments?
Gmail allows up to 25 MB per email. If your merged PDF exceeds this, use ZiaSign's Compress PDF tool to reduce the file size, or use Google Drive links for larger files.
Can I merge PDFs on my phone before emailing?
Yes. ZiaSign works in any mobile browser — upload, merge, and attach to your email directly from your phone.
Will the merged PDF be too large to email?
If it is, merge first, then use our Compress PDF tool to reduce the size. You can typically achieve 40-90% size reduction.

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Ready to merge PDF Files for Email Attachments?

Free to run, no card. Anonymous uploads are limited to 25 MB per file and 25 MB combined per operation. Confirm email to download; signed-in uploads support up to 100 MB per file and 100 MB combined per operation, subject to tool and plan limits.

The free plan includes 3 contracts/month. Review the current plan terms before sending.