How to Merge PDF Files on Mac, Windows, and Phone

Whether you're on a Mac, Windows PC, iPhone, or Android phone, you can merge PDF files — and you don't need to install any special software. The method varies slightly by platform, but the result is identical: a single combined PDF document. Here's how to do it on every major device.

On Mac (Using Preview — Built In)

macOS includes Preview, a built-in PDF viewer that can merge files without any additional software. This is the best option for Mac users who want offline processing with maximum privacy.

  1. Open your first PDF in Preview (double-click the file — Preview is the default PDF viewer on Mac)
  2. Go to View → Thumbnails to show the page sidebar on the left
  3. Open Finder and locate your second PDF
  4. Drag the second PDF's icon from Finder into Preview's thumbnail sidebar — its pages will be appended after the first document's pages
  5. Rearrange pages by dragging thumbnails up or down in the sidebar
  6. Go to File → Export as PDF to save the merged document

Tip: You can also drag individual page thumbnails from one PDF to another in Preview. This is useful when you want to interleave pages from different documents rather than simply appending one after the other.

Limitations: Preview works well for merging 2-5 files but becomes clunky with larger numbers of files. Dragging many PDFs from Finder one at a time is tedious.

On Windows (Using Online Tool)

Windows doesn't have a built-in PDF merger like Mac's Preview. The "Microsoft Print to PDF" feature can combine pages but is cumbersome for merging separate files. The easiest and most reliable method is using an online tool:

  1. Open your browser (Chrome, Edge, Firefox) and go to our Merge PDF tool
  2. Click "Upload Files" and select your PDFs from File Explorer — you can select multiple files at once by holding Ctrl while clicking
  3. Arrange the files in the desired order by dragging thumbnails
  4. Click "Merge PDF" and wait for processing (usually under 30 seconds)
  5. Download the merged file to your Downloads folder

Alternative: If you prefer offline tools, PDFtk (command line) or LibreOffice Draw can merge PDFs on Windows, but they require installation and are less intuitive than the online method. See our free alternatives guide for details.

On iPhone (Using Online Tool)

You can merge PDFs directly on your iPhone using Safari or Chrome. No app installation needed:

  1. Open Safari and go to our Merge PDF tool
  2. Tap "Upload Files" — you can select from Files app, iCloud Drive, Google Drive, Dropbox, or take a new photo of a document
  3. Arrange the PDFs in order by dragging the thumbnails
  4. Tap "Merge PDF" to combine them
  5. Tap "Download" to save the merged file to your iPhone
  6. The file will be saved to your Files app — you can share it from there via email, Messages, AirDrop, or any other app

Tip: If your PDFs are in email attachments, save them to Files first, then upload them to the merge tool. iOS makes it easy to move files between email, Messages, and the Files app.

On Android (Using Online Tool)

Android users can merge PDFs using Chrome or any browser:

  1. Open Chrome and navigate to our Merge PDF tool
  2. Tap "Upload Files" and select PDFs from your device storage, Google Drive, Dropbox, or other cloud apps
  3. Arrange the files in the desired order
  4. Tap "Merge PDF" to process
  5. Download the merged file — it will be saved to your Downloads folder
  6. Share directly from the browser or find it in your Files app to share via any messaging app

Tips for All Platforms

  1. Use consistent file naming — Name files with numbers (01_intro.pdf, 02_chapter1.pdf) to keep track of order. This is especially helpful when merging 10+ files.
  2. Check page sizes — If merging A4 and Letter-size PDFs, the merged document will have mixed page sizes. Consider standardizing first if you plan to print the result.
  3. Compress after merging — The combined file might be large. Use our Compress PDF tool to reduce size for email or upload. A 50 MB merged file can often be compressed to under 15 MB.
  4. Verify the result — Always open the merged PDF and check that all pages are present and in the correct order before sharing. Scroll through the entire document to confirm nothing is missing.

Frequently Asked Questions

Can I merge PDFs without internet?

On Mac, yes — use Preview. On Windows, you'd need to install offline software like PDFtk or LibreOffice. Online tools require an internet connection but offer the best user experience across all platforms with no installation needed.

Will merging work the same on all devices?

Yes. The merged PDF is identical regardless of which device you use to create it. The output file is a standard PDF that opens the same way everywhere — Mac, Windows, phone, tablet.

Can I merge PDFs from different cloud services?

Yes. Our online tool lets you upload files from your device, Google Drive, Dropbox, or any cloud storage accessible through your browser. You can mix sources — some files from Google Drive, others from your device.

Is there a limit to how many PDFs I can merge?

Free users can merge up to 2 files per task. Starter supports up to 20 files, Pro up to 100 files per task.

Summary

Whether you're on Mac, Windows, iPhone, or Android, our Merge PDF tool works right in your browser. No software to install, no platform limitations. Upload, arrange, merge, and download — it's that simple. Mac users who prefer offline processing can use the built-in Preview app. Everyone else gets the same fast, reliable experience from any device.