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Not great but at least there's no watermark..
Basically combines pdfs. Won't add files when I drag and drop (even though it says to do it). Remove selected file doesn't work, but remove all files works (meaning if you added a file twice you have to remove all and start all over again to get rid of it).
Pros: no watermark
simple
Cons: adding files by drag and drop doesn't work
the remove selected files doesn't work