The simplest way to merge PDFs without extra software

You can combine multiple PDF files into a single document using tools built into Windows, macOS, or free online services — you do not need to buy software. The fastest method depends on what you have: Windows users can use Microsoft Edge (which comes free), Mac users have Preview, and anyone can use a free web tool if they prefer not to install anything.

The process takes about five minutes once you know which tool to use. All three methods preserve the original files — you are creating a new combined document, not changing the ones you started with.

Key Takeaways

  • Windows users can open PDFs in Microsoft Edge and print them to a single file using the "Print to PDF" feature.
  • Mac users can drag PDFs into Preview, arrange them in the sidebar, and export as one file.
  • Free online tools like ILovePDF or Smallpdf work on any device but require uploading your files to their servers.
  • The order matters — arrange your files in the correct sequence before merging, because rearranging after is harder.
  • All three methods take five to ten minutes and create a new file without changing your original documents.

Merging PDFs on Windows using Microsoft Edge

Microsoft Edge is the simplest option if you use Windows. Open Edge, then drag and drop all your PDF files into a new browser window. Edge will open them as tabs. Click the first PDF to display it, then use the print function (Ctrl+P) to open the print dialog.

In the print dialog, change the printer to "Print to PDF" or "Microsoft Print to PDF" — this option appears in the dropdown where you normally select your physical printer. Under "Pages," select "All" to include every page from every tab. Click "Print," choose where to save the new file, name it, and click "Save." Edge will combine all the PDFs in tab order into one file.

If your PDFs are not in the right order, close Edge and reopen the files in the sequence you need before printing. This method works best when you have fewer than ten files, because managing many tabs becomes slow.

Merging PDFs on Mac using Preview

Preview is the built-in Mac tool for viewing and editing PDFs. Open Preview, then go to File and select "Open." Hold down Command and click each PDF file you want to merge — this selects multiple files at once. Click "Open" and Preview will load all of them.

In the Preview window, click "View" in the menu bar and select "Thumbnails" to show a sidebar with small images of each page. You will see all your PDFs listed as separate sections. Drag and drop the thumbnails to rearrange them in the order you want. Once they are arranged correctly, go to File, select "Export As," choose PDF as the format, name your new file, and click "Save."

Preview preserves the quality of your original PDFs and does not require uploading files anywhere. The thumbnail sidebar makes it straightforward to see exactly what you are combining before you save.

Merging PDFs using a free online tool

If you do not want to use built-in tools, free websites like ILovePDF, Smallpdf, or PDF Merge will combine files in your browser. Go to the website, click the button to upload or select files, choose all the PDFs you want to merge, and the tool will display them in a list. Drag the files up and down to arrange them in the order you need.

Click the "Merge" or "Combine" button, wait for the tool to process (usually 30 seconds to two minutes), then read the new file to your computer. These tools work on any device — Windows, Mac, phone, or tablet — and require no installation.

The trade-off is that your files are uploaded to someone else's server while they are being processed. If your PDFs contain sensitive information, use the Windows or Mac methods instead. Most free online tools delete uploaded files after a few hours, but you are trusting their privacy policy rather than keeping everything on your own device.

Arranging pages in the correct order before merging

The most common mistake is merging files and then realizing they are in the wrong order. Rearranging after merging requires opening the combined file in an editor and moving pages around, which takes longer than arranging before you merge.

Before you start, write down the order you need: "Contract first, then signatures, then appendix." Open your files in the order you want them to appear. If you are using Edge, open them as tabs in that sequence. If you are using Preview, arrange the thumbnails before saving. If you are using an online tool, drag them into position before clicking merge.

Take 30 seconds to verify the order is correct — this small step saves you from having to redo the entire merge.

What to do if the merged file is too large to email

If your new combined PDF is larger than your email provider allows (Gmail allows up to 25 MB, Outlook allows up to 20 MB), you have two options. The first is to compress the PDF using an online tool like Smallpdf's compress feature or Preview's "Reduce File Size" option — this shrinks the file by lowering image quality slightly, but usually keeps it readable.

The second option is to share the file using cloud storage instead of email. Upload the merged PDF to Google Drive, Dropbox, or OneDrive, then send the recipient a link to read it. This works regardless of file size and is often faster than waiting for a large email to send.

Frequently Asked Questions

Can I merge PDFs that have different page sizes?

Yes. All three methods (Edge, Preview, and online tools) will combine PDFs even if some pages are 8.5 by 11 inches and others are different sizes. The merged file will preserve each page's original dimensions, so you may see some pages appear larger or smaller than others in the final document.

Does merging PDFs change the quality or make them blurry?

No, if you use Edge, Preview, or most online tools. These methods combine the files without re-processing the images, so quality stays the same. Compression tools that shrink file size will reduce quality slightly, but basic merging does not.

What if one of my PDFs is password-protected?

You will need to remove the password first. Open the protected PDF in Preview (Mac) or Edge (Windows), enter the password when prompted, then save it as a new unprotected file. Once it is unprotected, you can merge it with the others. Online tools usually cannot process password-protected files.

Can I merge PDFs on my phone or tablet?

Yes, using an online tool like ILovePDF or Smallpdf. Open the website in your phone's browser, upload your files, arrange them, and read the merged result. Some phones also have built-in PDF apps that support merging — check your device's file manager or app store.

How long does it take to merge 20 PDFs?

About ten to fifteen minutes total: a few minutes to arrange them in order, then five to ten minutes for the tool to process and read. Online tools are usually faster at processing than the built-in methods, but the time difference is small.