Printzo is an Android app for printing from a phone. The user picks photos or a PDF from the phone's system file picker (or takes a photo with the camera through the system camera intent), chooses paper size (A4, Letter, Legal, A5, A6, A3, 4x6, 5x7, 3x5 inch photo paper), orientation, margins, number of photos per sheet, copies, colour/grayscale/ink-saver tone, and sees a live preview of the exact sheet that will be printed. The app builds the print-ready PDF entirely on the device with a bundled PDF engine (pdf-lib and pdf.js), then hands that PDF to Android's own printing framework (PrintManager), which shows the system print dialog where the user picks the printer or "Save as PDF". Printer discovery and drivers belong to Android's print services (default print service / Mopria / manufacturer plug-ins); Printzo does not talk to printers directly and has no cloud printing. Tools: Print photos (free), Print PDF (free), Poster mode that splits one photo across several sheets with glue overlap and cut marks (PRO), Scan & print that cleans a camera photo into a high-contrast document (PRO), Label & tag sheets with optional offline-generated QR codes (PRO). Monetization: a single auto-renewing subscription sold through Google Play Billing, "Printzo PRO", with weekly, monthly and yearly base plans and a 3-day free trial. There are no ads, no advertising SDK, no analytics SDK and no crash-reporting SDK. There are no user accounts and no login of any kind. Permissions: the app declares only INTERNET (required by the Google Play Billing library and by an anonymous remote-configuration request). It does NOT request camera, storage, location, contacts or any other runtime permission; files are chosen with the Android system picker and photos are taken through the system camera intent.