As such, it could open a PDF file as long as the %PDF-header started within the first 1024 bytes of the file. There’s, however, a change in the scheme of things now.

Windows then uses the default PDF reader app to open and load the file. You can also select the "Open with" option that appears when you right-click a PDF in Windows to manually select the program ...

Find the image you want to extract, then click it and select the Copy button in the toolbar. You can also right-click the ...

However, this default setting makes it difficult to open multiple PDF files in separate windows. You can change this setting within Acrobat and force PDF documents to open in new windows.

No matter your operating system, knowing how to combine PDF files is a good skill. We'll teach you the best ways to do so for Windows, macOS, or via the web.