Short answer: open a PDF merger, add your files, put them in order and click Merge PDF. On a Mac you can use Preview, and on an iPhone the Files app, without installing anything. Windows has no built-in option.
Joining invoices for an expense claim, putting scanned pages back together or bundling a contract with its appendices: combining PDFs is one of the most common document tasks. You don't need a paid copy of Acrobat. Here's how to do it for free on each device, how to get the page order right and what to do with protected files.
Which method to use on each device
| Device | Free method | Install anything? |
|---|---|---|
| Any (browser) | Online PDF merger | No |
| Windows | Online PDF merger | No |
| Mac | Preview | No |
| iPhone and iPad | Files app → Create PDF | No |
| Android | Online merger in the browser | No |
1. Online, without uploading your files
- Open the merge & split PDF tool.
- Select or drag in the PDFs you want to combine.
- Use the up and down arrows to set the order: the final file follows the list from top to bottom.
- Click Merge PDF and download the result.
The merge happens in your browser: the PDFs aren't sent to any server or stored anywhere. If the documents contain personal data (payslips, ID scans, contracts, medical records), that's the safest option. There's no watermark and no file limit.
Combine as many PDFs as you need into one file. Free, no watermark, no sign-up.
Merge PDF now →2. On Windows
Windows doesn't include a way to merge PDFs, and the free Acrobat Reader can't do it either (combining files is a paid Acrobat feature). The free alternatives are:
- An online merger in Edge, Chrome or Firefox, like the one above.
- If the documents are your own Word files, you can join them in a single document with Insert → Object → Text from File, then save it as a PDF.
3. On a Mac with Preview
- Open the first PDF in Preview.
- Choose View → Thumbnails to show the page sidebar.
- Drag the other PDFs from Finder into the thumbnail sidebar, where you want them to go.
- Drag pages around to reorder them if needed.
- Choose File → Export as PDF to save the combined document.
4. On iPhone and iPad with Files
- Open the Files app and go to the folder with your PDFs.
- Tap ⋯ → Select and pick the files in the order you want.
- Tap ⋯ at the bottom right and choose Create PDF.
A new PDF appears in the same folder. It works with photos too, so you can combine a PDF and photos of a document into one file.
5. On Android
Android has no built-in PDF merger. The easiest option is to open the online tool in your phone's browser and pick the files from Downloads or Google Drive. It works just like on a computer.
Splitting a PDF or removing pages
The same tool does the opposite: upload a document, enter the page range you want to keep (for example 1-3, 5, 8-10) and you get a new PDF with only those pages. See the full guide on how to split a PDF.
Tips for a clean merge
- Number your files (01, 02, 03…) if you have many, so they sort in the right order when you select them.
- Check the order before merging; it's quicker than redoing it.
- Password-protected PDFs: open them with the password and save an unprotected copy first (if you're allowed to).
- If the result is too big to email (many services cap attachments at 20–25 MB), shrink it with the PDF compressor.
- If your documents are in Word, convert them with the Word to PDF converter first and then merge them.
Frequently asked questions
How do I merge PDF files for free?
Use an online PDF merger: add your files, put them in order and click Merge PDF to download a single file. On a Mac you can also do it for free with Preview, and on iPhone with the Files app (select the PDFs and choose Create PDF).
How do I combine PDF files on Windows without software?
Windows has no built-in way to merge PDFs, and the free Acrobat Reader cannot do it either. The simplest option is an online tool in your browser. If you choose one that works on your device, your files are not uploaded to any server.
Can I merge PDFs without uploading them?
Yes. A browser-based merger combines the files locally, so they never leave your device. That is the safest choice for contracts, payslips, ID documents or medical records.
Does merging reduce PDF quality?
No. Pages are copied as they are, without recompressing text or images. The merged file is roughly the size of all the originals added together.
Can I merge password-protected PDFs?
Not directly. Open the file with its password and save or print a copy without protection (if you are allowed to), then merge it with the rest.
How do I combine photos and PDFs into one file?
Turn the photos into PDFs first: on iPhone, the Files app does it with Create PDF; on Windows, use Print → Microsoft Print to PDF. Then merge all the PDFs in the order you want.