The fastest way depends on which program you use

The simplest method is to open the document you want to keep as your main file, then copy and paste the content from the second document into it. This works in Microsoft Word, Google Docs, LibreOffice Writer, and most other editors. If your documents are short or you only need to do this once, copy-paste takes two minutes and requires no special steps.

If your documents are long, have complex formatting, or you combine files regularly, your program likely has a built-in merge or insert feature that preserves formatting better than manual copying. The exact location and name of this feature varies by program, so the sections below walk through the most common editors.

Key Takeaways

  • Copy-paste works in any document editor and takes a few minutes, but may lose some formatting if your documents use styles or complex layouts.
  • Microsoft Word's Insert > Object > Text from File feature keeps formatting intact and is faster than copy-paste for long documents.
  • Google Docs has no built-in merge feature, so you copy-paste content or use a third-party add-on if you need to combine files often.
  • LibreOffice Writer's Insert > Section feature lets you pull in another document while preserving its original formatting.
  • Always save your combined document with a new name so you keep the original files unchanged.

Combining documents in Microsoft Word

Open the document you want to be your main file. Place your cursor where you want the second document's content to appear — usually at the end, after pressing Enter a few times to create space. Go to the Insert tab at the top, then click Object (or Text from File, depending on your Word version). A file browser will open; navigate to and select the second document, then click Insert.

Word will paste the entire second document into your main file at that location, keeping its original formatting — fonts, spacing, headings, and styles stay as they were. If the formatting looks wrong after insertion, you may need to adjust spacing or page breaks manually. Once both documents are in one file, save it with a new name so you do not overwrite either original.

If you are using Word Online (the free version in your browser), this feature is not available. You will need to copy and paste manually instead: open both documents side by side, select all text in the second document with Ctrl+A (or Cmd+A on Mac), copy it, switch to your main document, and paste it where you want it.

Combining documents in Google Docs

Google Docs does not have a built-in merge or insert feature. The standard approach is to open both documents in separate browser tabs, then copy and paste. Open your main document in one tab and the second document in another. In the second document, select all text with Ctrl+A (or Cmd+A), copy it, switch to your main document, click where you want the content, and paste.

If you combine documents regularly and want a faster method, you can install a third-party add-on. Open your main document, click Extensions in the menu, then search for "merge" or "combine" in the add-on store. Several free add-ons exist, though they vary in reliability and how much data they collect. Review the privacy policy of any add-on before installing it, since add-ons can see the content of your documents.

Another option is to use Google Drive's folder structure: keep both documents in the same folder, then manually copy sections between them. This is slower than merging but gives you more control over what gets combined.

Combining documents in LibreOffice Writer

LibreOffice Writer has an Insert > Section feature that lets you pull another document into your current one while keeping its formatting intact. Open your main document and place your cursor where you want the second document to appear. Go to Insert in the menu, then click Section. A dialog box will open; click the From file button, navigate to your second document, and click Insert.

LibreOffice will create a linked section — the content appears in your main document, but it is technically still connected to the original file. If you edit the original second document later, those changes will show up in your combined file automatically. If you want a permanent copy instead of a linked one, you can break the link after inserting by right-clicking the section and selecting Edit Section, then unchecking the Link checkbox.

Combining documents in other editors

Most free or open-source editors like AbiWord, OnlyOffice, or Calligra Words have an Insert menu with an option to insert text from another file. The exact name and location vary, but the process is similar: open your main document, place your cursor where you want the second document, find the Insert menu, look for an option like "Text from File" or "External Document", and select your second file.

If your editor does not have this feature, copy-paste is your only option. This is also true for very basic editors like Notepad or online editors designed for straightforward text only.

What happens to formatting when you combine documents

When you use an insert or merge feature (rather than copy-paste), most programs preserve the original formatting of both documents. However, conflicts can happen: if your main document uses a font called "Calibri" and your second document uses "Georgia", both fonts will appear in the combined file, which can look inconsistent. If both documents define a style called "Heading 1" differently, one definition will override the other.

To avoid formatting problems, open the combined document and scan it for inconsistencies. Look for sudden font changes, unexpected spacing, or headings that look different from what you expected. You can fix these by selecting the problem text and explore the correct style from your main document's style list. Most programs let you access styles through a sidebar or panel — in Word, it is the Styles pane; in Google Docs, it is Format > Styles; in LibreOffice, it is Format > Styles.

Keeping your original files safe

Always save your combined document with a new name. If you open Document A, insert Document B into it, and then save, you will overwrite Document A with the combined version. You will no longer have a copy of Document A by itself. Instead, use Save As (or Save a copy in Google Docs) and give the new file a clear name like "Document A and B Combined" or "Final Report v2".

Keep your original documents in a separate folder or mark them clearly so you do not accidentally delete them. If you need to combine the same documents multiple times or make changes to the combined version, having the originals available makes it straightforward to start over.

Frequently Asked Questions

Can I combine more than two documents at once?

Most programs require you to combine documents one pair at a time. Open Document A, insert Document B, save the result as Document AB, then open Document AB and insert Document C. Some third-party tools can merge multiple files in one step, but they are usually paid software or require technical setup.

What if the two documents have different page sizes or margins?

The combined document will use the page settings of your main document for the entire file. If the second document was formatted for a different page size, you may see awkward page breaks or spacing. After combining, you can adjust margins and page breaks manually, or reformat the inserted content to match your main document's settings.

Will combining documents affect my privacy or data?

Using your program's built-in merge feature keeps everything on your device (or in your cloud account if you use Google Docs or OnlyOffice). Third-party add-ons may collect data about your documents, so review their privacy policy before installing. Copy-paste never sends data anywhere — it stays entirely within your program.

Can I undo a merge if I change my mind?

Yes. Use Ctrl+Z (or Cmd+Z on Mac) when ready after inserting to undo. If you have already saved and closed the file, you can reopen your original documents and start over. This is another reason to save your combined file with a new name — your originals stay unchanged.

What if one document is in a different format, like PDF?

Most word processors cannot insert a PDF directly. You will need to convert the PDF to a Word or text document first using a free tool like Smallpdf or ILovePDF, then combine as usual. Be aware that PDF conversion sometimes loses formatting, especially if the PDF has images or complex layouts.