AI PDF Reader

in a Renewed Exprience

UPDF delivers the ultimate PDF reading experience with multiple viewing modes, cross-platform support, AI and smart features.

Free Download

Support: Windows · macOS · iOS · Android

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1 AI Reading
2 Comfortable Reading
3 PDF Navigation
4 Cross Platforms
5

Eye-Friendly, Efficient, and AI-Powered PDF Reading

AI-Powered Smart Reading

No more struggling with technical terms, lengthy paragraphs, complex logic, or foreign languages
—AI Assistant simplifies everything.

How to Summarize PDF

Summary and Mind Map

Summarize PDF or convert PDF to mind map for clear key points and structure
Instant Translation

Translate selected text or the whole PDF while preserving the layout
Chat with PDF

Ask questions and get instant answers

Free Download

Comfortable Reading
Experience

UPDF offers flexible reading modes like Eye-Care Mode, Presentation Mode and Compare Mode. Customize the background color and page layout for a book-like reading feel.

How to Enable PDF Dark Mode

Eye-protection Mode

Minimize blue light for extended reading sessions
Dark Mode

Reduce eye strain in low-light environments
Colorful Backgrounds

Customize your reading environment with soothing colors
Larger Reading Window

Maximize your view for distraction-free reading

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Efficient PDF Navigation

With advanced bookmarks, quick page navigation, and a powerful search that highlights relevant content, navigating large or complex documents becomes effortless and efficient.

How to Find Synonyms with UPDF

Lightning-fast rendering

Open massive files and render 10,000-page PDFs instantly
Smart Bookmarks New!

Auto-generated with summaries for easier navigation
AI Semantic Search New!

Locate the right information quickly with AI-powered understanding
UPDF Copilot New!

AI assistant that guides you to find right tools faster

Free Download

Read PDFs Anywhere,
Anytime

Sync and protect documents across devices, accessing PDFs on the go. Use Text-to-Speech to listen to selected text for a smooth, secure reading experience.

How to Read PDF on iPhone How to Read PDF Aloud

Multi-Device Sync

Seamless access across mobile, desktop, and tablet—supports Windows, macOS, iOS, and Android
Secure & Encrypted

Encrypt documents to ensure privacy across all platforms

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