I've got a book of harpsichord music 30 pages long which is all in separate pdf pages or files that i want to add to IMSLP. I was told I need to "merge" them into a single file. Where can i find a useable FREE software that will do this without putting writing or watermarks all over the page. I'm not about to pay for software which I only need to provide IMSLP with "free" music.
Any help is appreciated!