Merge PDF email attachments: one file instead of dozens

Why merging attachments is more convenient

If you send 10 attachments per email the recipient has to open them all separately. One bundled PDF file is easier: one click, one download, one document to print or archive. It also looks more professional — especially for quotes, reports or legal correspondence.

Step by step: merge attachments

Upload all PDF attachments to the Merge tool on PDFrust. Sort them in logical order: start with the main letter or summary document, followed by attachments in the order they are referenced. Download the bundled file. Add a table of contents if the bundle is long.

Table of contents as first page

For large bundles of 20+ pages a table of contents on page 1 is a professional addition. Create a simple TOC PDF ("Attachment 1: Quote — p. 1", "Attachment 2: Specifications — p. 5", etc.), add it as the first PDF in the Merge tool. The recipient immediately sees what is in the package and on which page.

Compress for email limits

Bundled PDFs can get large quickly. Email providers have limits: Gmail and Outlook accept attachments up to 25 MB, other providers less. Use the Compress tool after merging to reduce file size. If the file is larger than 25 MB, use a file sharing service (WeTransfer, Google Drive, Dropbox) and send the link.

File name for the attachment

Give the bundled file a clear name so the recipient immediately knows what it is: "2026-07-25_Quote_ProjectName.pdf" or "ApplicationDossier_Name_2026.pdf". Avoid generic names like "document.pdf" or "scan.pdf".

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