How to Merge PDF Files Online
- Add your PDFs. Drop two or more files into the box above. Each file shows its page count and a thumbnail of the first page.
- Arrange the order. Use the ▲ ▼ arrows. The numbered badges show the final order.
- Name the file (optional) and choose whether to add a blank page between documents. This is handy for double-sided printing.
- Click Merge PDFs. The combined document opens in a preview so you can scroll through every page before downloading.
Tip: You can mix in JPG or PNG images, for example a scanned receipt or a photo of a signed page. Each image becomes its own page.
How to Merge PDF Files on Mac (Preview)
- Open the first PDF in Preview.
- Choose View → Thumbnails to show the page sidebar.
- Drag the other PDF files from Finder into the sidebar, where you want them to appear.
- Choose File → Export as PDF to save the combined document.
Preview works well for a couple of files. For many files, or to reorder whole documents quickly, the tool above is faster.
How to Merge PDFs on iPhone or iPad
In the Files app, tap Select, choose the PDFs, then tap the More (•••) button and choose Create PDF. Or open this page in Safari and use the tool above, which works the same on mobile.
How to Combine PDF Files on Windows
Windows doesn't include a built-in tool for combining PDFs. The quickest free option is to use the merger above in Edge or Chrome. Your files stay on your PC, there's nothing to install, and it works for any number of files.
Why Use K4Converter to Merge PDFs?
- Private: merging happens in your browser. Contracts, statements and IDs are never uploaded to a server.
- Keeps quality: pages are copied exactly, so text stays selectable and nothing is re-compressed.
- No limits or watermarks: merge as many files as your device can handle.
- Works everywhere: Windows, Mac, Chromebook, iPhone and Android.
Need the opposite? Save PDF pages as JPG images, turn images into a PDF, or sign a PDF after merging.
Works on Every Device
The Merge PDF tool runs in any modern browser (Chrome, Safari, Edge and Firefox) on Windows, Mac, Chromebook, iPhone, iPad and Android. It uses the same open-source PDF technology found in Firefox, running entirely on your device, so there's no upload wait, no file-size cap from a server, and no account or watermark.
Troubleshooting & Tips
- "This PDF is password-protected" Open it with the password and save an unlocked copy (for example with Print → Save as PDF), then add that copy.
- The merged file is large Merging keeps every page at full quality. To shrink scanned pages, convert them to images and back with lower quality, or compress the source scans first.
- Pages appear in the wrong order The order follows the numbered list. Use the arrows before clicking Merge.
- Can I merge only some pages? Merge the whole files first, then save just the pages you need with PDF to JPG, or reorder in a PDF editor.
Frequently Asked Questions
How do I merge PDF files for free?
Add your PDFs to the tool above, put them in order and click Merge PDFs. It's free with no signup, limits or watermark.
Is it safe to merge confidential PDFs here?
Yes. The files are combined inside your browser and never uploaded, so nobody else can see them.
Can I change the order of the PDFs?
Yes. Use the up and down arrows next to each file before you merge.
Can I merge password-protected PDFs?
Not directly. Remove the password first (you'll need to know it), then add the unlocked file.
Will merging reduce the quality of my PDF?
No. Pages are copied as they are, so text, images and links keep their original quality.
Written by Prakhar Singh, software engineer and creator of K4Converter · Last updated October 2026