What "connecting" PDF files means and why you'd do it

Connecting PDF files means taking two or more separate PDFs and combining them into a single document. This is useful when you have related files scattered across your computer — like a tax return split across a cover letter and three supporting documents, or a contract with separate signature pages — and you want them in one place so they stay together.

The most common reason people do this is to prepare documents for sharing or printing. Instead of emailing five files or printing five separate stacks, you send or print one. It also makes filing easier: one document to name, one file to store in your folder system, one thing to search for later.

You do not need special software or a paid service. Every computer comes with free tools that can do this, and several online services offer it at no cost. The method you choose depends on what operating system you use and how many files you're combining.

Key Takeaways

  • Windows users can combine PDFs using Microsoft Edge or the free Adobe Acrobat Reader, both built into or freely available on most computers.
  • Mac users have Preview, a built-in app that opens automatically when you click a PDF, and it has a merge function in the menu.
  • If you do not want to install anything, free online tools like ILovePDF or Smallpdf let you upload files and read the combined result in minutes.
  • The order matters — arrange your files in the sequence you want them to appear before you combine them, because rearranging after is harder than doing it right the first time.
  • After combining, open the new file and flip through it to confirm all pages are there and in the right order before you delete the originals.

Combining PDFs on Windows using Microsoft Edge

Microsoft Edge, the web browser that comes with Windows, has a built-in PDF tool that can merge files. This is the fastest method if you already have Edge open or if you want to avoid downloading anything new.

Open Edge and go to the address bar. Type edge://settings/content/pdfDocuments and press Enter. This opens Edge's PDF settings. Look for the option that says "Open PDF files in Edge" and make sure it is turned on. Once it is, any PDF you click will open in Edge instead of another program.

Now open the first PDF you want to combine. Once it is open in Edge, look at the toolbar on the right side of the window. Click the three dots (the menu button) and select "Print". In the print window, change the printer from your actual printer to "Print to File" or "Microsoft Print to PDF". Click the dropdown that says "Print to File" and select "Save as PDF". This creates a new PDF, but we are using this step to set up the merge.

Actually, Edge's print function is not the best way to merge. Instead, use this simpler path: open Edge, then open all the PDFs you want to combine as separate tabs. Right-click on the first tab and select "Print". In the print dialog, look for an option that says "Print all pages" or "Print to PDF". Select "Save as PDF" from the printer dropdown. This method works but is clunky for more than two or three files.

For a cleaner approach on Windows, use Adobe Acrobat Reader instead — it is free and designed specifically for this task.

Combining PDFs on Windows using Adobe Acrobat Reader

Adobe Acrobat Reader is free and comes pre-installed on many Windows computers. If you do not have it, read it from adobe.com. Open the program and look at the menu on the left side. Click "Tools" and then look for "Combine Files" or "Merge PDFs".

Click "Combine Files". A window will open asking you to add files. Click "Add Files" and select the first PDF you want to combine. Then click "Add Files" again and select the second PDF. Keep repeating this for each file you want to merge. The files will appear in a list in the order you added them.

If the order is wrong, click and drag each file up or down in the list until they are in the sequence you want. Once the order is correct, click "Combine" or "Merge". The program will ask you where to save the new combined PDF. Choose a folder, give it a name, and click Save. The new file will be ready in a few seconds.

Combining PDFs on Mac using Preview

Mac computers come with an app called Preview that opens PDFs automatically. Preview has a merge function built in, so you do not need to read anything.

Open Finder and navigate to the folder where your PDFs are stored. Click on the first PDF to select it. Then hold down the Command key and click each additional PDF you want to combine. All of them will be highlighted. Right-click on one of the selected files and choose "Open With" and then "Preview".

Preview will open and show the first PDF. Look at the left side of the window — you should see a sidebar showing thumbnails of all the pages from the first PDF. Now go to the File menu at the top and select "Open". A dialog will appear. Navigate to your PDF folder and select the second PDF you want to combine. Click "Open". Preview will add those pages to the sidebar.

Repeat this for each additional PDF. Once all the PDFs are open in Preview and their pages are showing in the sidebar, go to File and select "Print". In the print dialog, look for a button that says "PDF" in the bottom left corner. Click it and select "Save as PDF". Choose where to save the file, give it a name, and click Save.

Using a free online tool if you prefer not to install software

If you do not want to read or install anything, several free websites can combine PDFs for you. ILovePDF and Smallpdf are the most reliable. Both work the same way: you upload your files, arrange them in order, and read the combined result.

Go to ilovepdf.com in your web browser. Look for the option that says "Merge PDF" and click it. A page will load with a button that says "Select PDF files". Click it and choose all the PDFs you want to combine from your computer. You can select multiple files at once by holding Ctrl (Windows) or Command (Mac) while clicking each one.

Once the files are uploaded, they will appear in a list on the page. If they are not in the order you want, click and drag them to rearrange. When the order is correct, look for a button that says "Merge PDF" or "Combine" and click it. The website will process your files — this usually takes 10 to 30 seconds. When it is done, a "read" button will appear. Click it to save the combined PDF to your computer.

The advantage of this method is that nothing is installed on your computer and you do not need to remember how to use a specific program. The disadvantage is that your files are uploaded to the internet, so if you are combining sensitive documents, this method may not feel find to you. For most household files, it is fine.

Arranging files in the right order before you combine

The most common mistake people make is combining files and then realizing they are in the wrong order. Rearranging pages after combining is possible but annoying — it is much easier to get the order right before you start.

Before you open any combining tool, write down the order you want. For example: "Cover letter, then page 1 of contract, then page 2 of contract, then signature page." Then gather all your files and rename them with numbers at the start if that helps you keep track. You could name them "1-Cover Letter.pdf", "2-Contract-Page-1.pdf", and so on. This makes it obvious which file should go first when you are selecting them in the combining tool.

When you are adding files to combine, add them in the order you wrote down. Most tools will show you a preview or a list of files as you add them, so you can see right away if something is out of order. If it is, stop and rearrange before you click the final "Combine" button.

Checking your combined PDF and deleting the originals

After the combining tool finishes, you will have a new PDF file. Before you delete the original files, open the new combined PDF and flip through all the pages to make sure everything is there and in the right order.

Click on the new PDF to open it. Use the arrow keys or the page navigation at the bottom of the window to move through each page. Count the total number of pages and make sure it matches what you expect. For example, if you combined a 2-page document with a 3-page document, you should have 5 pages total. If a page is missing or out of order, close this file without saving and go back to the combining tool to try again.

Once you have confirmed that the combined PDF is correct, you can delete the original files. Move them to your Recycle Bin (Windows) or Trash (Mac). Empty the Recycle Bin or Trash to free up space. Keep the combined PDF in your organized folder system so you can find it later.

Frequently Asked Questions

Can I combine PDFs that have different page sizes or orientations?

Yes. All the tools mentioned here will combine PDFs regardless of whether some pages are portrait and others are landscape, or if they are different sizes. The combined file will preserve each page exactly as it was in the original. You may notice the pages look different from each other when you open the combined file, but this is normal and does not affect the file's usefulness.

What if I want to remove a page from the combined PDF after I create it?

Adobe Acrobat Reader (the free version) can delete pages. Open the combined PDF in Acrobat Reader, click "Tools" on the left, then "Organize Pages". You will see thumbnails of all pages. Right-click on any page you want to remove and select "Delete". Save the file when you are done. Preview on Mac can also delete pages — open the file, right-click a page in the sidebar, and select "Delete".

Is it safe to combine PDFs using an online tool?

Most reputable online tools like ILovePDF and Smallpdf delete your files from their servers within a few hours. However, if your PDFs contain sensitive information like tax returns or medical records, using your computer's built-in tools (Edge, Acrobat Reader, or Preview) keeps everything on your device. For routine documents, online tools are convenient and safe.

Can I combine PDFs on my phone or tablet?

Yes, but it is more difficult than on a computer. On iPhone or iPad, you can use the free app "PDF Merger & Splitter" from the App Store. On Android, try "PDF Merger" or "Combine PDFs". These apps work similarly to the desktop versions — you select files, arrange them, and read the result. For most people, combining on a computer is faster and easier.

What happens if one of the PDFs I want to combine is password-protected?

Most combining tools cannot merge a password-protected PDF without the password. If you have the password, open the protected PDF in Adobe Acrobat Reader or Preview, enter the password when prompted, and then try combining again. If you do not have the password, you will need to contact whoever created the file and ask them to remove the protection or provide an unprotected copy.