Page deletion: select the page from the sidebar and press the delete key Page addition: drag a page from another PDF sidebar into the Preview sidebar Merging:

Page deletion: select the page from the sidebar and press the delete key Page addition: drag a page from another PDF sidebar into the Preview sidebar Merging: same, but for a whole PDF Encryption: File > Edit Permissions > Require Password to Open Document Decryption: If you have the password, then the same flow Redaction/Markup/Signatures: All from the Markup menu