Third-party developers "crack" these applications to provide paid subscription features for free. In an "unlocked" version of Adobe Acrobat, you typically get access to: Modifying text and images directly on mobile.
Exporting PDFs to Word, Excel, or PowerPoint. or deleting pages.
Adding password protection and restricting editing permissions. or deleting pages.
Converting scanned documents into searchable, editable text. Adobe Acrobat Reader: Edit PDF - Apps on Google Play or deleting pages.
Merging multiple files, reordering, or deleting pages.