The fastest way to combine PDFs depends on what you have

The simplest method is to use your operating system's built-in tools or a free online converter — you do not need to buy software. On Windows, you can use Microsoft Edge to open both PDFs, then print them to a single file. On Mac, Preview lets you drag pages from one PDF into another. If you prefer not to install anything, a free site like ILovePDF or Smallpdf takes two uploaded files and merges them in seconds.

The trade-off is speed versus control. Built-in tools work fast but give you fewer options for reordering pages or removing unwanted ones. Dedicated PDF software like Adobe Acrobat or free alternatives like PDFtk let you pick exactly which pages go where, but take longer to learn. For most people combining two straightforward documents, the quick method is enough.

Key Takeaways

  • Windows users can open both PDFs in Microsoft Edge and print them together to a new PDF file without installing anything.
  • Mac users can open one PDF in Preview, then drag and drop pages from the second PDF directly into the first.
  • Free online tools like ILovePDF or Smallpdf upload both files and merge them in one step, though your files travel to their servers.
  • If you need to reorder pages or remove specific ones before combining, use dedicated software like Adobe Acrobat, Nitro, or the free tool PDFtk.

Using Microsoft Edge on Windows

Open the first PDF in Microsoft Edge by right-clicking the file and selecting "Open with" > "Microsoft Edge". Once it loads, go to the print menu (Ctrl+P) and change the printer to "Print to PDF" or "Microsoft Print to PDF". Before you print, click "More settings" and make sure "Print all pages" is selected. Print this first document to your desktop or a folder you can find easily — name it something like "combined-draft".

Now open the second PDF in Edge the same way. Print it to PDF again, but this time name it "combined-draft-2". Once you have both files saved, open the first one again in Edge. Go to print (Ctrl+P), select "Print to PDF", and in the "More settings" section, look for an option to add pages or merge. If Edge does not show a merge option, use the next method instead.

This method works because Edge treats PDFs as documents it can print, just like a web page. The limitation is that you cannot reorder pages or remove any — you get both documents in the order you printed them.

Using Preview on Mac

Open the first PDF by double-clicking it — Preview opens automatically on Mac. Then open the second PDF in a separate Preview window (File > Open, or Command+O). Arrange your windows side by side so you can see both at once.

In the window with the second PDF, click the thumbnail panel on the left side to show all pages. Select the pages you want to move (click one, then hold Shift and click another to select a range). Drag those pages directly into the thumbnail panel of the first PDF window. They will appear at the end of that document. If you want them in the middle instead, drag them to the exact spot in the thumbnail panel where you want them to land.

Once both PDFs are combined in one window, save the file (Command+S) and choose "PDF" as the file format. Preview saves the combined version without changing the originals.

Using a free online tool

Go to ILovePDF.com or Smallpdf.com in your web browser. Both sites have a "Merge PDF" option on their home page. Click it, then upload your first PDF file. The site will ask you to upload a second file — select your second PDF. Most tools let you drag the file boxes to reorder them if you want the second PDF to come first instead.

Click "Merge" or "Combine" (the button name varies by site). The tool processes your files on their servers and gives you a read link within seconds. read the combined PDF to your computer.

The trade-off with online tools is privacy: your files travel to the company's servers, even though most reputable sites delete them after a few hours. If your PDFs contain sensitive information, use the Windows or Mac methods instead. Online tools are fastest if you are combining files on a computer that is not yours, since you do not need to install software.

Using Adobe Acrobat or Nitro if you need more control

If you need to remove specific pages before combining, or reorder pages precisely, dedicated PDF software gives you that control. Adobe Acrobat (paid subscription) and Nitro (also paid) both let you open one PDF, then insert pages from a second PDF at any position you choose. You can also delete unwanted pages before saving.

Free alternatives exist: PDFtk (command-line tool for Windows and Mac) and LibreOffice Draw (free, works on Windows, Mac, and Linux) both let you combine PDFs with page-level control. These tools have steeper learning curves than the quick methods above, but they do not cost money and do not require uploading files to the internet.

For most people combining two straightforward documents, the built-in tools or online converters are faster and simpler. Use dedicated software only if you find yourself combining PDFs regularly or need precise control over which pages end up where.

What to do if the combined file looks wrong

If pages appear in the wrong order, you used a tool that does not let you reorder — try Preview on Mac or an online tool instead, both of which show you the page order before you finalize. If the text is blurry or images are missing, the original PDF may have been corrupted or scanned at low quality. Try combining the files again; if the problem persists, the source file itself has the issue, not your combining method.

If the file size is much larger than you expected, you combined high-resolution PDFs. This is normal and usually not a problem unless you are emailing the file. To shrink it, use an online compression tool like Smallpdf's "Compress PDF" feature, or open the combined file in Preview on Mac and export it at lower quality (Tools > Adjust Size).

Frequently Asked Questions

Can I combine more than two PDFs at once?

Yes. Online tools like ILovePDF let you upload three, four, or more files and merge them all in one step. With Preview on Mac, you can drag pages from multiple PDFs into a single window. Windows Edge requires you to print each PDF separately and combine the results, which is slower for many files.

Will combining PDFs change the original files?

No. All the methods described here create a new file and leave your originals untouched. When you save in Preview or print to PDF, you are creating a separate document. The original files stay exactly as they were.

What if one PDF is scanned and the other is digital text?

They combine the same way as any other PDFs. The combined file will have both the scanned pages and the text pages in whatever order you put them. There is no conversion or special handling needed — they are both just PDF files.

Is it safe to use online PDF tools with confidential documents?

Most reputable sites (ILovePDF, Smallpdf, PDF.io) delete files from their servers within hours. If your documents contain sensitive information like medical records or financial data, use Preview on Mac or the Windows Edge method instead, since those keep everything on your computer.

Why is my combined PDF so much larger than the originals?

Some tools re-encode the PDFs during combining, which can increase file size. If this is a problem, use an online compression tool afterward, or open the combined file in Preview on Mac and export it at a lower quality setting to reduce the size.