PDF Guides

How to Merge PDF Files: The Complete 2025 Guide

Published by ContinuePDF Team ·

Why Merge PDF Files?

Combining multiple PDF documents into a single file is one of the most common PDF tasks. Whether you're consolidating reports, creating document packages, or organizing scanned pages, knowing how to merge PDFs efficiently saves time and reduces clutter.

Method 1: Merge PDFs Online (Fastest)

The quickest way to merge PDF files is using an online tool like ContinuePDF's PDF Merger. Here's how:

  1. Visit the Merge Tool - Open ContinuePDF Merge PDF in any browser
  2. Upload Your Files - Click "Select PDFs" or drag and drop multiple files
  3. Arrange Order - Drag files to reorder them as needed
  4. Merge & Download - Click "Merge PDFs" and download your combined file

This method works on any device with a browser - Mac, Windows, iPhone, or Android.

Method 2: Merge PDFs on Mac

Mac users have several options:

Using Preview (Built-in)

  1. Open the first PDF in Preview
  2. Go to View > Thumbnails
  3. Drag additional PDFs into the thumbnail sidebar
  4. Save as a new PDF

Using ContinuePDF (No Installation)

For a more intuitive experience, use ContinuePDF on Mac. It's faster and provides more control over the merge process.

Method 3: Merge PDFs on Windows

Using ContinuePDF (Recommended)

Windows doesn't have a built-in PDF merger, making ContinuePDF the best free option. It works in Edge, Chrome, or Firefox.

Using Microsoft Print to PDF

  1. Open PDFs in a viewer
  2. Print to "Microsoft Print to PDF"
  3. This method is slow and loses some formatting

Method 4: Merge PDFs on iPhone/iPad

The Files app can combine PDFs, but it's limited. For better results:

  1. Open Safari and go to ContinuePDF
  2. Upload your PDF files
  3. Rearrange and merge
  4. Save to Files or iCloud

Method 5: Merge PDFs on Android

Android lacks native PDF merging. Use:

  1. Open Chrome and visit ContinuePDF
  2. Select your PDF files from device storage
  3. Merge and download

Privacy Considerations

When merging sensitive PDFs (contracts, financial documents), choose a tool that doesn't upload your files to servers. ContinuePDF processes everything locally in your browser - your files never leave your device.

Troubleshooting Common Issues

Large Files Taking Too Long?

Try compressing your PDFs first to reduce file sizes before merging.

Wrong Page Order?

Use the PDF Organizer to rearrange pages after merging.

Need to Remove Pages?

After merging, use Delete Pages to remove unwanted content.

Conclusion

Merging PDFs is simple with the right tool. For maximum convenience, privacy, and compatibility across all devices, ContinuePDF's Merge Tool is the best free option available.