Merge PDF Files

Combine multiple PDFs into one file, instantly, privately, for free.

Drag and drop any number of PDFs in any order
Reorder files before merging with a click
Password-protected PDFs supported
Files never leave your device, zero uploads

NilPDF Merge runs entirely in your browser using WebAssembly, no file ever leaves your device. Whether you're combining contracts, reports, or scanned documents, the result is a single, clean PDF downloaded directly to you. Files up to 200MB each are supported, no account required, and no data sent to any server.

Your files stay on your device. They are processed entirely inside your browser using WebAssembly. Nothing is uploaded to any server. NilPDF has no backend, there is no server to send your files to.

Frequently Asked Questions

Is merging PDF files really free?

Yes, completely free, unlimited use, no account required.

Are my PDF files safe when I merge them?

Your files never leave your device. All processing happens in your browser using WebAssembly (Pyodide). NilPDF has no server, there is nothing to upload to.

How many PDFs can I merge at once?

There's no limit. You can drag in as many files as you need, reorder them, and merge into one.