There are several ways to merge word documents:
How to merge word documents using Microsoft Excel and Microsoft Word
Microsoft Excel enables you to do mail merge. It's not super intuitive, but this link provides pretty clear instructions: https://support.office.com/en-us/article/mail-merge-using-an-excel-spreadsheet-858c7d7f-5cc0-4ba1-9a7b-0a948fa3d7d3. In order to use this, you have to own Microsoft word
How to merge word documents using easymailmerge.com, for free
If you don't have Microsoft Word or Microsoft Excel on your desktop, using those apps are not possible. Easymailmerge.com makes it easy to merge word documents for free. It also enables you to
- Merge Microsoft Word documents with Google Sheets
- Merge Microsoft Excel files with Google Docs
- Merge Google Docs with Google Sheets
Easymailmerge.com does all that and more, for free. For more information, head here: http://easymailmerge.com/lp/merge-word-documents
Easymailmerge.com is the only app that allows you to merge word documents for free.