Is there a free way to combine PDF files?

The short answer is: yes, you can combine PDF files for free in a few steps:

1. Scroll up on this page to use the PDF Merger tool.
2. Drag-and-drop (or click to upload) your first document below.
3. Press the “Add more files” button in the lower part of the screen
4. Add the files you want to merge: the 2nd, 3rd, etc... files
5. Press “Apply Changes”

Wait a few seconds ⏲️.

And then you will be able to download the new, freshly-merged PDF file!

It's free and it doesn't require any signup/login — although you could do that in order to be able to access the files in the future.