Is 18PDF really free?

Yes. All 18 tools are free to use, with no signup, no file size limit, and no watermarks on output.

Are my files uploaded to a server?

No. Every operation runs entirely in your browser using WebAssembly. Your files never leave your device.

No. There is no signup, no login, and no tracking. Open the tool and start working immediately.

There are no artificial limits. The only constraint is the memory of your device, since processing happens locally.

No. The tool runs in your browser, so you can merge as many files as your device memory allows.

No. The originals are untouched. The merged file is a new PDF you download.

No. All merging happens locally in your browser. Nothing leaves your device.

Combine multiple PDFs into one

Drop files or click to browse

Add multiple PDFs, then drag to reorder