How to Merge PDF Files Online — Free & Private

Merging PDFs is one of the most common document tasks. Whether you're combining invoices, reports, or scanned pages, you need a tool that's fast and respects your privacy.

Most online PDF mergers upload your files to their servers. PDF Tools Pro does it differently — all processing happens in your browser using WebAssembly. Your files never leave your device.

Simply drag and drop your PDFs, arrange them in your preferred order, and click Merge. The combined PDF downloads instantly with no watermarks, no signup, and no file upload.