potatameister/PaperKnifePlus — reverse-engineered prompt

Build me a simple Android app for working with PDFs on my phone, with privacy as the main selling point. I want it to work completely offline, with no accounts, no uploads, no ads, and no tracking.

The app should let me pick PDF files from my device, merge them together, split a PDF into smaller files, rotate pages, rearrange pages, and add password protection. It should also let me turn photos into a PDF and export pages from a PDF as images, ideally bundled together so they’re easy to save or share.

Please make the app feel clean and easy for normal people to use, with clear buttons, helpful empty states, progress feedback, and simple success or error messages. Files should never leave the device. Include a basic app icon, a polished home screen, and make sure the final project can be built as an installable APK.