How to Merge PDF Files on Windows & Mac
Two contracts that need to be one attachment. A cover letter and a résumé. Twelve scanned receipts for one expense report. Combining PDFs is one of the most common document jobs there is. Here are the three best free ways to do it, on any computer.
Fastest way: open our free Merge PDF tool, drop in your files, drag them into order, and download the combined PDF. Everything happens in your browser; your documents are never uploaded.
Method 1: In your browser (works on Windows, Mac, and Chromebooks)
- Open the Merge PDF tool.
- Drag your PDF files in (or click to browse). Add as many as you need.
- Drag the files into the order you want them to appear.
- Click Merge and download your single combined PDF.
Because the merge runs locally with in-browser processing, it's private by design (contracts, statements, and IDs stay on your machine) and there's no upload wait, no sign-up, and no watermark.
Method 2: On a Mac, Preview is built in
macOS ships with a real PDF combiner hiding in Preview:
- Open the first PDF in Preview.
- Choose View → Thumbnails so the page sidebar appears.
- Drag the second PDF file from Finder straight into the sidebar, at the position you want its pages.
- Reorder pages by dragging thumbnails; delete any you don't need.
- Choose File → Export as PDF… to save the merged file.
One caution: saving in place can overwrite your original, so export a copy instead.
Method 3: On Windows, the honest answer
Windows 10 and 11 have no built-in way to merge PDFs. The commonly suggested workaround (opening files in Edge and using Print → Microsoft Print to PDF) technically produces a combined file, but it re-renders every page: text can blur, links and bookmarks are stripped, and file size often balloons. It's fine in a pinch; it's not what you want for anything that matters.
Your practical options on Windows are a browser-based merger (Method 1, nothing to install) or a desktop app like PDFsam Basic (free, open source) if you regularly merge very large batches offline.
Which method should you use?
| Situation | Best method |
|---|---|
| Any computer, occasional merges | In-browser merge (Method 1) |
| Mac, quick page-level control | Preview sidebar (Method 2) |
| Windows, no installs allowed | In-browser merge (Method 1) |
| Huge batches, fully offline | Desktop app (PDFsam Basic) |
Frequently asked questions
Is it safe to merge sensitive documents online?
Only if the site processes files in your browser rather than uploading them. Our merger runs entirely on your device; you can even disconnect from the internet after the page loads and it still works.
Will the merged PDF stay searchable?
Yes. A true merge copies pages untouched, so text layers, fonts, and searchability are preserved. Only print-to-PDF workarounds lose them.
Can I reorder pages, not just files?
For page-level control, merge the files first, then use the Split PDF tool to extract exactly the pages you want in a new order.
Why is my merged PDF huge?
Merging adds file sizes together, so scans add up fast. Run the result through the Compress PDF tool, and see also why PDFs get so large.