Simple PDF Viewer & Reader

Fast, simple PDF viewer with library, thumbnails, dark mode, and clean settings.

Sia PDF Viewer — Fast, Lightweight PDF Reader

Sia PDF Viewer is a clean, lightweight PDF reader built for one purpose: reading PDFs comfortably on your Android device. No bloated
editors, no unnecessary features — just a fast, focused reading experience.

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📖 TWO READING MODES

• Scroll Mode — Continuously scroll through pages like a web page. Perfect for long documents and research papers.
• Swipe Mode — Flip through pages one at a time with natural swipe gestures. Ideal for books, presentations, and focused reading.

Switch between modes anytime with a single tap.

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🔍 INTUITIVE ZOOM & GESTURES

• Pinch to zoom with smooth, responsive animation
• Double-tap to zoom in and out instantly
• Pan freely while zoomed in — scroll vertically and horizontally with natural one-finger gestures
• Zoomed scrolling works seamlessly in both reading modes

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📚 ORGANIZE YOUR LIBRARY

• Create categories and subcategories to organize your PDFs
• Import PDFs from your device using the built-in file picker or open them directly from other apps
• View your library as a list or grid with thumbnail previews
• Sort by name, date added, file size, or last opened
• Search your library by file name
• Track reading progress — see how far you've read at a glance with progress indicators on each book

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🔖 BOOKMARKS & NAVIGATION

• Bookmark important pages for quick access
• Jump to any page instantly with the page slider or direct page input
• Bookmarked pages appear as quick-access chips at the bottom of the screen
• Your reading position is always saved — pick up right where you left off

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🌙 COMFORTABLE READING

• Night mode inverts PDF colors for comfortable reading in the dark — easy on your eyes
• Adjust screen brightness directly from the reader without leaving the app
• Fullscreen immersive mode hides system bars for a distraction-free experience
• Lock screen rotation to stay in your preferred orientation
• Auto-scroll lets you read hands-free at adjustable speeds (0.2x to 3.0x)
• Screen stays awake while you read — no more tapping to keep the display on

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⚡ FAST & EFFICIENT

• Lightweight app with minimal storage footprint
• Smart page caching delivers smooth scrolling even with large documents
• Priority rendering focuses on pages you're actually viewing
• Low-resolution preview during fast scrolling, automatically replaced with full quality when you stop
• Memory-efficient rendering uses half the memory of typical PDF readers

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🎨 PERSONALIZE

• Choose between Light, Dark, or System-follow theme
• Set your preferred default reading mode (scroll or swipe)

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🔒 PRIVACY FIRST

• All your data stays on your device — PDFs, reading history, and settings are stored locally
• No cloud uploads, no tracking, no accounts required
• Full GDPR compliance with transparent data handling
• Delete all your data anytime from Settings

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📤 SHARE & VIEW INFO

• Share PDFs with other apps directly from the reader
• View document details: file name, page count, file size, and your current reading position

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💎 REMOVE ADS

• Sia PDF Viewer is free to use with ads
• A one-time purchase removes all ads permanently — no subscriptions

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Sia PDF Viewer is designed for readers who want a simple, reliable PDF app without the clutter. Whether you're reading textbooks,
research papers, manuals, or ebooks, Sia PDF Viewer gets out of your way and lets you focus on what matters — your content.

Download now and enjoy a better PDF reading experience.