A free app for Windows, by convertidor-de-pdf.

The Unir PDF app is an all-in-one tool that can be used in both personal and professional settings. With it, you can merge PDF files easily. You can also edit PDFs by adding text or other elements.

It is a very easy-to-use tool that can be used by people of all ages. There is no need to install any other software to perform these tasks. All you need is this app.

The app allows you to combine multiple PDFs into one document. It supports all the file formats that are currently available on the market.