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Quick answer
To merge PDF files, open Zappy Merge PDF, add up to 20 PDFs, drag them into the order you want, then click Merge PDFs. The combined file downloads straight away. It is free, needs no account, adds no watermark, and the merge runs in your browser, so your files are never uploaded.
How to merge PDF files in 3 steps
This works the same on a Windows PC, a Mac, a Chromebook, an iPhone or an Android phone. All you need is a browser.
Add your PDFs
Open Merge PDF and drag your files onto the page, or click to choose them. You can add up to 20 PDFs at once.
Put them in order
Each file appears as a tile. Drag the tiles until they are in the order you want the pages to appear in the finished document.
Merge and download
Click Merge PDFs. The pages are joined in that exact order and the new PDF downloads immediately.
How to merge PDF files on a Mac
Every Mac includes Preview, which can combine PDFs without any extra software:
- Open the first PDF in Preview.
- Choose View > Thumbnails so the page sidebar appears.
- Drag the other PDF files from Finder into the sidebar, dropping them where you want their pages to go.
- Choose File > Export as PDF and save the combined file under a new name.
Preview works well for two or three files. For longer stacks, dragging tiles in Merge PDF is quicker because you can see and reorder every file at once.
How to merge PDF files on Windows
Windows 10 and Windows 11 do not include a tool that combines PDFs. Microsoft Print to PDF can create a PDF, but it cannot join existing ones.
The simplest free option is a browser tool. Open Merge PDF in Edge or Chrome, add your files and merge them. There is nothing to install and no trial to cancel later.
How to merge PDF files on iPhone and iPad
The Files app can combine PDFs on its own:
- Open Files and go to the folder that holds your PDFs.
- Tap Select and choose the files you want to combine.
- Tap the More button (three dots) and choose Create PDF.
Files combines them in the order they appear in the folder, so rename them first (01, 02, 03) if the order matters. To drag pages into any order instead, open Merge PDF in Safari. It works the same way on a phone.
How to merge PDFs without Adobe Acrobat
Combining files in Adobe Acrobat needs a paid subscription. You do not need it for a one-off merge:
Swipe to compare →
| Zappy Merge PDF | Mac Preview | Adobe Acrobat Pro | |
|---|---|---|---|
| Price | Free | Free (Mac only) | Paid subscription |
| Account needed | No | No | Yes |
| Works on Windows and phones | Yes | No | Needs the app |
| Reorder files before merging | Drag tiles | Drag thumbnails | Yes |
| Files uploaded | No, merged in your browser | No | Depends on the version |
If you already pay for Acrobat, use it. Otherwise a free browser tool or Preview does the same job.
Tips for a clean merged PDF
- Name files in order first. Starting names with 01, 02, 03 makes them easy to line up.
- Check page orientation. If a scanned page is sideways, fix it with Rotate PDF before or after merging.
- Remove pages you don't need. Blank or duplicate pages are easy to drop with Delete PDF pages.
- Shrink it for email. Gmail limits attachments to 25 MB and Outlook to 20 MB. If the merged file is too big, run it through Compress PDF.
Frequently asked questions
How do I merge PDF files into one for free?
Open Zappy Merge PDF, add your files, drag them into order and click Merge PDFs. The combined file downloads immediately. There is no account, no watermark and no daily limit.
Can I merge PDF files without Adobe Acrobat?
Yes. A free browser tool such as Zappy Merge PDF combines files without Acrobat, and Mac users can also use Preview. Neither needs a subscription.
How do I combine PDF files on a Mac?
Open the first PDF in Preview, show thumbnails, drag the other PDFs into the sidebar in the order you want, then choose File, Export as PDF. Or use Zappy Merge PDF in Safari or Chrome.
How do I merge PDF files on Windows 10 or 11?
Windows has no built-in way to merge PDFs. Open Zappy Merge PDF in Edge or Chrome, add your files, set the order and click Merge PDFs.
How many PDF files can I merge at once?
You can add up to 20 PDFs in one go. To combine more, merge the first 20, then merge that result with the next batch.
Will merging PDFs reduce the quality?
No. The pages are copied into the new file as they are, so text stays sharp and images are not recompressed.
Are my files uploaded when I merge them?
No. Zappy merges PDFs inside your browser, so your documents never leave your device.
How do I merge PDFs on my iPhone?
In the Files app, select the PDFs, tap the More button and choose Create PDF. Or open Zappy Merge PDF in Safari to drag the files into any order first.