Upload files
Choose the PDFs to merge.
Combine PDF files, in your browser
This tool merges two or more PDF files into a single document. Add your files, arrange their order, and the pages are appended one after another into one PDF you can download. Your original files are left unchanged.
Merging runs in the browser with pdf-lib, so pages are copied exactly as they are. Nothing is re-rendered, recompressed, or sent anywhere, and the result opens in any normal PDF reader.
Why your files stay on your device
Privacy here is structural, not a promise. There is no upload step because there is no server to upload to:
- The merge runs entirely in your browser.
- The page is served as static files and makes no request with your PDF data.
- The source is open and anyone can read it (MIT).
- It works offline, which is only possible because nothing leaves the device.
If you want to check for yourself, open your browser's Network panel while merging — no request carries your files. Read the source.
How to use it
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Add PDFs
Click to select two or more PDF files, or drop them anywhere on the page. You can add more at any time.
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Set the order
Move files up or down to arrange them, or remove any you don't need. Pages are combined in the order shown.
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Merge and download
Combine the files into one PDF and download it. Your original files are untouched.
FAQ
Are my files uploaded anywhere?
No. The merge runs entirely in your browser. There is no server component, so your files have no path off your device. The source is open and you can confirm this in your browser's Network panel.
How do I choose the order pages appear in?
Each file you add appears in a list. Move files up or down to arrange them, and remove any you don't want. The pages are combined top to bottom in exactly that order.
Does merging change the original files?
No. Your input files are read on the device and left unchanged. The tool produces a new combined PDF for you to download; nothing is overwritten.
Does it reduce quality or compress the pages?
No. Pages are copied exactly as they are — there is no recompression, OCR, or re-rendering. The merged PDF keeps the same content and quality as the originals.
Can it merge password-protected PDFs?
No. Encrypted (password-protected) PDFs can't be opened, so they can't be merged. You'll see a clear message if a file is protected; remove the password first, then try again.
Does it work offline?
Yes. It is a PWA. After the first visit it is cached, so merging works without a network connection. You can also install it to your home screen.
Is there a limit on file size or number of files?
There is no fixed limit. Because everything runs in your browser, the practical ceiling depends on your device's memory. Very large or numerous PDFs may be slower.