DocuScan

DocuScan — modern Android document scanner. Camera capture, gallery import, auto-crop, 12+ image filters, multi-page PDF & JPG export.

A modern, local-first Android document scanner. Capture or import images, apply 22 filters, crop and rotate each page, and export as PDF or JPG.

Built with Kotlin + Jetpack Compose (Material 3) + CameraX, modeled after the MakeACopy feature set.

Features 📷 Camera capture with in-app preview, flash & front/back flip (CameraX) 🖼️ Gallery import (system photo picker — no storage permissions needed) 📄 PDF import — open an existing PDF and its pages become editable pages 🧭 Manual crop — like MakeACopy: drag the four corners or the edges (parallel edge translation), with a snap-to-right-angle assist that locks near-vertical/horizontal edges to 90° and aspect-ratio presets (Auto, Original, A3/A4/A5, US Letter, Legal, custom) enforced at warp time; output is deskewed via perspective warp. The crop toolbar sits at the bottom of the image with Rotate ⟲/⟳, aspect chips and Crop/Reset/Cancel — exactly like MakeACopy's crop screen 🔄 Rotate — rotate a page 90° at a time, either in the editor or while cropping ✨ MakeACopy document cleanup — the same OpenCV presets: Natural, Enhanced and Clean Text (background flattening, CLAHE local contrast, clean-up), on top of the 19 classic filters 🎨 22 filters — Original, Natural, Enhanced, Clean Text, Magic, B&W (real Otsu threshold binarization), Grayscale, Sepia, Polaroid, Vintage, Soft, Warm, Cool, Ocean, Rose, Blue, Invert, Vivid, Faded, Crisp, Sharpen, Night 🔆 Brightness & contrast sliders 📚 Multi-page documents — add/remove/reorder pages 📄 Export — PDF with page-format presets (Fit-to-image, A4, US Letter, Legal) and quality presets (High/Standard/Small/Very small, 300/200/150/110 dpi); JPG with configurable quality + color/B&W 📨 Inbox Mode — pick a folder (SAF) and every export is automatically saved there too — great for paperless-ngx / Syncthing / Nextcloud workflows ♿ Accessibility Mode — spoken + haptic feedback and volume-key shutter in the camera 📤 Share with one tap (PDF or JPG) 🗂️ Document library — browse, view, re-share or delete past scans, with search over titles 📨 Share-to-scan — open an image from any app with "Send to DocuScan" 🌙 Modern Material 3 UI, light/dark/system theme Everything is processed on-device — no network calls, no accounts, no uploads.