Add a PDF to a Word document

A thesis appendix and a Friday deadline

Tomás is finishing his master's thesis in thesis-draft.docx. His supervisor wants the draft by Friday, complete with two appendices that only exist as PDFs: ethics-approval.pdf, a two-page signed letter from the university committee, and interview-codebook.pdf, a 38-page reference document that a reader might consult but will not read start to finish. Later, the library expects the final version as a single PDF.

Those two files need different treatment. The approval letter must be visible on the page, in print as well as on screen, because examiners check the signature. The codebook only has to be reachable. And because the final submission is a PDF, there is a third option that avoids nesting files in Word altogether. Each route produces something different, which is why the same request ends in such different results.

What each route leaves in your document

Before choosing, look at what the reader actually gets. This is the comparison Tomás used:

For Tomás the answer split in two: page images for the approval letter, an icon for the codebook in the draft, and appending for the final library copy.

Show the pages as pictures in your text

The PDF to images tool renders pages in your browser tab; the file is not uploaded anywhere. Then Word treats each page like any photo you insert:

1. Open the tool and choose ethics-approval.pdf. It reports the file name, the number of pages and the size, so you can confirm you picked the right document.
2. Set the format and resolution. JPG at 150 DPI is preselected and suits pages that are mostly photographs. For a letter with small print and a signature, switch to PNG, which keeps edges crisp. Pick 300 DPI if the thesis will be printed and bound, and 96 DPI only for something read on screen in a hurry.
3. Choose the pages. "All pages" is the default; for part of a longer file, select "Choose pages" and type something like 2 or 1, 3-5.
4. Export and download. Each image is opened again and its pixel dimensions are checked against the resolution you chose. One page arrives as a single file, for example ethics-approval-page-001.png; several pages arrive as ethics-approval-images.zip with numbered files that keep their order.
5. In Word, place the cursor under the appendix heading, use the Pictures command on the Insert tab, and add the images in order. Open Layout Options next to each picture and pick In Line with Text, so the page moves with the surrounding text instead of floating.

An A4 page at 300 DPI is 2480 by 3508 pixels, far wider than a text column, so Word shrinks it to fit the margins. That is fine: the extra pixels are what keep the signature and the letterhead sharp on paper.

Keep the whole file behind an icon

For the codebook, the draft only needs a way in. In Word for Windows, go to the Insert tab and open Object in the Text group. On the Create from File tab, browse to interview-codebook.pdf, leave Link to file unticked so a full copy goes inside the document, and tick Display as icon. Change Icon lets you replace the file name under the icon with a caption such as "Appendix D: interview codebook (PDF, 38 pages)". Word for Mac has an Object command as well, but its dialog is arranged differently.

The embedded copy adds roughly its own size to the .docx. A 38-page scanned codebook can easily weigh several megabytes, so run it through the compress tool first if the document is going out by email. Without the icon option, Word usually shows a preview of page one, which readers often mistake for the whole document.

If the final copy is a PDF, append instead of nesting

When the destination is a PDF, as with Tomás's library submission, an icon inside Word is useless: it does nothing once the document is exported. Save a copy of the Word document as PDF, then join it with the appendices in the merge tool in this order: thesis, approval letter, codebook. The appended pages keep their original quality, and any text that was selectable in the source stays selectable.

Two details to check. If your PDF export created bookmarks from Word headings, the merge tool will tell you before it runs that they may not carry into the new file. And Word's page numbers stop where the thesis ends, so the appendices keep whatever numbering they had. The guide to combining several Word files into one PDF covers the export side in more detail.

Problems that appear on someone else's screen

• The appendix looks blurry when printed. The page was exported at 96 DPI. Export it again at 300 DPI and replace the picture.
• A picture jumped to the next page after an edit. It was set to a wrapping style that lets it float. Switch it to In Line with Text.
• The icon opens nothing for the reader. The object was linked to a file on your own drive instead of embedded. Insert it again with Link to file unticked.
• The document will not send. An embedded scan made the .docx too large for the mailbox. Compress the PDF, then embed the smaller copy.
• Twenty pages of pictures nobody can search. Long documents as images frustrate readers and screen readers alike. Embed or append them instead and picture only the page that must be seen.

Cases where Word, or the author, is the better source

If you actually need to edit what the PDF says, neither pictures nor objects help. Word can open many PDFs directly and convert them into editable text, though the layout gets rebuilt; the PDF to Word guide compares that with converting in the browser. If a colleague made the PDF from a Word file, the quickest fix is often to ask for the .docx and copy the content across with its styles intact.

Word for the web and the phone apps do not offer the full Object dialog, so in a shared online document the page image route, or a plain link to the file, works better. And if your institution forbids web tools for patient records or HR papers, the Object route needs nothing beyond Word itself. For the spreadsheet version of this task, see adding a PDF to Excel.