Merge Word documents in the browser
What gets concatenated
Merge is for two or more .docx files that should become one .docx. The sample cover says “Project: Harbor map” and the appendix says “Scale: 1:5000”. Put the cover first and the appendix second. The result inserts a page break between them and remains a .docx, not a PDF. Body text is concatenated in list order. Headers, footers, and section settings follow the first file. Images are copied when the file stores them in the usual media folder. Other embedded objects can be dropped. At least two files are required, up to twelve, and each file must be 20 MB or smaller.
This is not a comparison. Nothing is highlighted. If you need to see what changed between two drafts, use compare first and merge only when you have decided which files should sit in sequence. The work is local. NexTool does not upload the documents. Download the merged .docx and open it in Word before you send it, because a dropped image or a header from the wrong file is easier to see there than in a file name. If the recipient needs a PDF, convert the checked .docx with Word to PDF afterward.
Order and leftovers
List order is the document order. Drag the cover above the appendix before you export. A page break is inserted between files, so the appendix should start on a new page even if the cover was short. It will not renumber headings for you, and it will not reconcile two different style systems into one design. If both files define a style named Normal differently, expect the first file to win where the format says it follows the first file. Open the result and scroll through the join. If a picture that you know was in the appendix is missing, it was not stored in the usual place inside the .docx and you should paste it by hand.
Order is the whole job
Merge is for separate .docx files that should become one document with a page break between them. The sample puts cover.docx, which says “Project: Harbor map,” before appendix.docx, which says “Scale: 1:5000.” Your files follow the same rule: the first file’s headers are kept, and each later file starts on a new page. If the appendix must be read first, put it first. The tool will not guess a story from the file names. Look at the preview from top to bottom before you download. A missing page break usually means the source did not end where you thought, not that the browser invented a page.
Both files are read locally. NexTool does not upload them to stitch the XML, and the merged .docx is not stored for you. The usual limit is 20 MB per file. Embedded images come along only when the preview can see them. Comments do not become a shared review. If you needed a PDF, merge first, open the .docx, and then decide whether Word to PDF is honest enough for that recipient. If you needed to see what changed between two drafts, merge is the wrong tool. Use compare, which does not glue the files together. Keep the separate originals until the combined file has been opened and the page order is the one you meant.