Combining a PDF and a Word file into one document is a common need — a contract body in PDF with an appendix in Word, a report PDF with an updated cover letter in Word, or multiple deliverables that need to go out as a single file. The most reliable approach is to convert everything to PDF first, then merge. Trying to combine the formats directly without conversion leads to formatting inconsistencies.
The Core Approach: Convert Word to PDF, Then Merge
The cleanest method is a two-step process. First, convert the Word document to PDF. Then Merge PDF both files — the original PDF and the newly converted Word-as-PDF — into one combined document. This ensures consistent formatting, page size, and rendering across the entire final file.
Step 1 — Convert Word to PDF: in Microsoft Word, File > Save As > PDF. Use the native export, not Print to PDF, to preserve links and formatting. The result is a PDF that matches the Word document exactly.
Step 2 — Merge the PDFs: use WukongPDF's Merge PDF tool at www.wukongpdf.com. Upload both PDF files, arrange them in the correct order, and download the combined result. The final file is a single PDF containing all pages from both documents.
Controlling Page Order in the Combined File
Most merge tools let you drag files into the desired order before combining. If you need the Word content at the front — as a cover letter before the PDF body — upload the Word-derived PDF first. If it's an appendix, upload it after the main PDF. The order at upload determines the page order in the output.
For more complex arrangements — inserting the Word pages in the middle of a PDF rather than at the beginning or end — split the original PDF first at the insertion point, then merge in order: first half + Word PDF + second half. WukongPDF's split tool handles the first step, then the merge tool handles the combination.
Using Adobe Acrobat Pro to Combine Directly
Adobe Acrobat Pro can accept Word files directly in its Combine Files tool (Tools > Combine Files > Add Files). Acrobat converts the Word document internally during the combine process — you don't need to pre-convert to PDF manually. Drag both files into the combine interface, arrange them in order, and click Combine.
Acrobat uses its own Word-to-PDF conversion engine for the inline conversion, which is high quality. The result is a single PDF as if you had pre-converted and merged manually. This one-step approach saves time if you have Acrobat Pro available.
Check That Page Sizes Match
A common problem when combining documents from different sources: the Word document is set to A4 and the PDF is Letter size, or vice versa. The merged file ends up with pages of different sizes — visually jarring and sometimes causing printing issues.
Before merging, check the page size of both documents. In Word, Layout > Size shows the current page size. In the PDF, File > Properties > Description shows the page dimensions. If they don't match, set the Word document to the same page size as the PDF before converting, or use Acrobat Pro to normalize all pages to one size after merging.
After Combining: Check and Compress
After merging, open the combined PDF and scroll through every page to confirm the order is correct, pages from both documents look consistent, and nothing was dropped or duplicated during the merge. Check that the total page count matches the sum of both source documents. If the combined file is large — particularly if the Word document contained images — run it through a PDF Compression tool to reduce the size before distributing. A combined file that's well-structured and reasonably sized is more useful than a large one that's awkward to share.