© Provided by CNET Use these tips to combine PDFs on Mac or Windows devices. Sarah Tew/CNET

Trying to merge multiple PDFs together? Don't get stressed. Though working with lots of different documents can get tricky, there are a few easy ways you can combine PDFs together, whether you're constructing a portfolio or just looking for ways to cut down on file clutter.

Merge PDF Files Software can merge your PDFs in several ways, such as merging different PDF files together into one, adding more pages to an existing file, rearranging the pages into a different order, and so on. These software also have additional features that make generating PDFs more convenient, such as the ability to encrypt your documents.

1. Open the Smallpdf Merge PDF tool in your browser to get started. Here, you can select and drag in PDF files or click on the “Choose File” button to select PDF files from local storage. After selecting the files, click on the “Choose” button. The PDF files will now be uploaded to the website.
2. This online tool allows merging multiple PDF files and images to a single PDF file. You can select up to 20 Files, drag and drop them into the text box. You have to wait for file upload and the processing to be complete. You can change the order for the files by rearranging them and then converting the same.

Step 1 - Download PDFBinder.

One of the most popular tools for combining PDFs is Adobe Acrobat, but that software will cost you at least $13 a month for a subscription. Luckily, there are a few other ways you can combine PDFs for free, no matter what type of computer you're using.

Here's how to combine multiple PDFs for free, whether you're working on a Windows device or a Mac. (We've also got tricks for how to easily sign PDFs, and four free apps for better PDF editing.)

How to combine PDFs on Windows

If you're using Windows, you'll need a third-party app to help you combine PDFs. We tested a few, and found a solid option in PDF Merger & Splitter by AnywaySoft. It's available through the Microsoft Store for free.

Here's how to merge PDFs with this app:

• Open the app, and choose Merge or Split. If you just need to merge two documents without changing the order of any pages, choose Merge.
• Click Add PDFs, and select however many you want to merge. You have the option to move them up or down, or sort by name. You can also preview what the merged documents will look like.
• Once your documents are in order, hit Merge, and name and save the new merged PDF.

If you want to customize your merger a bit more, such as by changing the order of pages or only adding in certain parts of each PDF, you'll have to split them first. To do that, select Split when the app opens. Choose which individual pages or page ranges you want to pull out. You can save them as one PDF, or as individual PDFs.

Read more:How to download Windows 11 free

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How to combine PDFs on Mac

On Mac, you can combine PDFs with a built-in tool found in Preview, according to Apple Support.

Here's how to combine two PDFs:

• Open a PDF in Preview.
• Go to View > Thumbnails. You'll see page thumbnails in the sidebar.
• Select the thumbnail for the page where you want to insert the other document.
• Click Edit > Insert > Page from File (if the Page from File selection is dimmed so you can't click it, make sure that the file you have open is a PDF. Some encrypted PDF documents can't be merged, according to Apple . Check the permissions of a PDF by choosing Tools > Show Inspector, then click the lock icon).
• Select the PDF you want to add, and click Open.
• Choose File > Export as PDF to save.

And here's how to combine parts of one PDF with another PDF:

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• Open the PDFs you want to combine in Preview.
• In each document, choose View > Thumbnails. You'll see page thumbnails in the sidebar.
• Press and hold the Command key, and select the page thumbnails that you want to add to the other document. Let go of the Command key.
• Drag the selected thumbnails to the sidebar of the other PDF, and release where you want them to go. (If you have macOS Sierra or earlier, drag the thumbnails directly into a thumbnail in the other PDF.)

You can rotate, delete and reorder pages from the thumbnail section, too.

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Now that you've mastered combining all of your PDFs, make sure to check out other hidden Mac tips and secret Windows 10 tips, and how to download Windows 10, Windows 11 and Microsoft Office apps for free.