The Merge pdf files node lets you combine multiple PDF files into a single document within your module.
Use it when you want to consolidate several PDFs, for example, reports, attachments, or user uploads, into one file that can be previewed, downloaded, or sent via email.
How to configure
- Add the Merge pfd files action node at the point in your module where you want to combine files.
- Select the PDF files to merge from the dropdown list.
- Use the six dot icon (drag controls) next to each file to reorder them. The final PDF follows this sequence.
- Enter a name for the merged result in the Result file name field (for example
FinalReport.pdf). - You can now use your file variable in the next step in your module (e.g., referenced in input nodes, displayed in Document view, or attached in Send Email actions).
Supported files & Known limitations
- Only PDF files are supported. Other file types (e.g., .docx, .xlsx) are ignored.
- Ensure that the files are not password-protected.
- The combined file cannot exceed 50 MB. If the total of all input files exceeds this limit, the node will fail.
- Files uploaded via a File upload input node with the option Allow multiple file uploads enabled (these files are stored internally as a ZIP) cannot be used – only individual PDF uploads are supported.
Troubleshooting
| Issue | What to check |
|---|---|
| “Combined PDF would exceed maximum file size” | Reduce the number or size of input PDFs so the total is under 20 MB. |
| Files missing / cannot load | Ensure all selected file variables exist and are available when the node runs. |
| Unexpected page order | Verify the file order in the node’s configuration – this controls page order in the merged PDF. |
| No output generated | Make sure at least one valid PDF is selected. If only non-PDFs or a ZIP from multi-upload are selected, the node cannot proceed. |
Best Practices
- Use clear file names (e.g.,
SubmissionBundle_2025.pdf) for the merged PDF. - For many or large PDFs, consider splitting files or reducing size to avoid hitting the 20 MB limit.
- Place a Document view node after the merge so users can preview the combined PDF.
- When requesting uploads from users, guide them to submit PDFs if you plan to merge files.