Sia PDF Viewer
Lightweight and fast PDF reader for Android.
About
Sia PDF Viewer is a lightweight, dependency-free PDF reader for Android that renders documents using only the native Android PdfRenderer API. It features both scroll and swipe page navigation modes, smooth pinch-to-zoom with spring animations, a dark mode filter, and an integrated file library with category management and search.
Features
- Scroll mode (continuous vertical) and swipe mode (single page horizontal pager)
- Pinch-to-zoom with spring animation and smooth scaling (0.2x to 3.0x)
- Night mode with ColorMatrix inversion filter
- Page bookmarks stored in Room DB with quick-jump navigation
- Full-screen reading with system bar and swipe-to-share
- Screen rotation lock
- File library with 2-level category hierarchy, breadcrumb navigation, and search
- List and grid view modes with sorting options (name, date, size, last opened)
- SAF file picker and external intent PDF auto-import
- Thumbnail disk cache (WebP) with loading progress display
- PDF sharing via FileProvider
- Theme support: system, light, and dark
- Multi-language support with instant locale switching