Your files stay on your device • No upload to server • No account required

Merge PDF Files Online Free

Merge multiple PDF files into a single document in seconds. Our browser-based tool lets you combine PDFs without uploading anything to a server — your files stay on your device. Drag to reorder pages and download the merged result.

How to merge PDF files

  1. 1Upload two or more PDF files using the tool above.
  2. 2Arrange them in your preferred order by dragging.
  3. 3Click "Generate file" to merge them into one PDF.
  4. 4Download the combined PDF — all processing happens in your browser.

Why merge PDFs in your browser?

100% Private

Files never leave your device. No upload, no server, no third-party access.

Free & Unlimited

No file size limits, no watermarks, no registration required.

Works Offline

After the page loads, the tool works even without internet.

Fast Processing

Powered by PDF-Lib — merge hundreds of pages in seconds.

100% Private — No Upload, No Account

Your PDF never leaves your device. All processing is done locally in your browser using WebAssembly — no files are uploaded to any server, no account or sign-up is required, and after the page loads the tool works even without internet. Perfect for sensitive documents like contracts, invoices, and IDs.

Frequently Asked Questions

How many PDFs can I merge at once?

There is no hard limit. You can merge as many PDFs as your browser can handle.

Is it safe to merge PDFs online?

Yes. All processing happens entirely in your browser. Your files are never uploaded to any server.

Are there any file size limits?

There are no imposed limits, but very large files may affect browser performance.

Can I reorder pages before merging?

Yes, you can drag files to reorder them before merging.

Are my PDF files uploaded to a server?

No. All processing happens entirely in your browser using WebAssembly. Your files never leave your device — there are no uploads to any server. After the page loads, the tool works even without an internet connection.

Is this tool free to use?

Yes, completely free. There are no hidden charges, no file size limits, no watermarks on output files, and no registration or account required. Use it as much as you need.

Can I merge PDF files on a mobile phone or tablet?

Yes. The tool works in any modern browser on mobile, tablet, or desktop. The interface is responsive and works with touch input. No app download needed.

Will the PDF quality change after processing?

No. The tool preserves your original PDF content and quality exactly. Only the changes you requested are applied — text, images, and layout remain unchanged.

Can I merge PDF files if the PDF is password-protected or encrypted?

No. Password-protected or encrypted PDFs cannot be processed. You need to remove the protection first (using a tool like Adobe Acrobat or a free online unlocker), then upload the unprotected file.