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.

The application is integrated into Windows Explorer and with a right click on the PDF files the user can set their PDF properties.

It is also possible to drag and drop PDF documents to be modified to the main window of the application.

The application does NOT need Adobe Acrobat software installed.

Also, special items, such as filename, directory path, current date and time, last write time e.t.c., can be set as custom PDF properties, automatically.

All versions of PDF documents are supported and also password-protected PDF documents are supported.

The application is multilingual and translated into 38 languages.