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. There are no file size limits, no account required, and no data sent to any server.

100% private. Your files 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.