With Free PDF Metadata Editor 4dots you can batch edit PDF properties, of many PDF documents,i.e. set metadata such as author, title, subject and keywords e.t.c., with a single mouse click.You can also batch set unlimited user-defined custom PDF metadata.It is absolutely free, very easy to use and also multilingual.Easily you can select and batch set the metadata of whole folders and their subfolders with PDF documents.Drag and drop supported.