Reagon PDF Reader - No Ads

Reagon File Reader redefines document viewing on Android, offering an ultra-lightweight, high-performance, and privacy-first solution for all your essential file formats. Built entirely in Kotlin, this app is engineered for speed, efficiency, and absolute user privacy, allowing you to open PDF, DOCX, XLSX, PPTX, and CSV files directly on your device without any internet connection or reliance on bulky third-party software.

Experience Unmatched Performance and Efficiency

Unlike conventional document viewers that consume hundreds of megabytes and drain your battery, Reagon File Reader boasts an incredibly small footprint, typically 3-5 MB. It delivers an instant cold start in under 0.5 seconds and a locked 60fps/120fps scrolling experience, ensuring seamless navigation through even the most complex documents. This exceptional performance is achieved through custom-built, zero-dependency rendering engines and meticulous UI/UX optimizations, including predictive page prefetching for PDFs and intelligent view recycling for smooth scrolling.

Absolute Privacy and Unwavering Security

In an era of pervasive data tracking, File Reader stands as a beacon of privacy. The application is designed with a "trust-no-one" cybersecurity model, fundamentally omitting the android.permission.INTERNET permission. This means zero network access, zero telemetry, and zero data exfiltration – your documents and personal information never leave your device. Furthermore, the app enhances security by:

• Avoiding Third-Party SDKs: Eliminating supply-chain vulnerabilities by relying solely on pure-Kotlin code and native Android APIs.

• Sandboxed WebView: DOCX files are rendered in a strictly sandboxed Android WebView with JavaScript disabled, preventing XSS and macro execution attacks.

• XXE Protection: Utilizing Android's native XmlPullParser to inherently guard against XML External Entity injection attacks.

• Resource Exhaustion Mitigation: Implementing strict safety valves, such as CSV buffer ceilings (8 MB/10,000 rows) and PPTX image caps (20 MB), to prevent "Zip Bomb" and Out-Of-Memory (OOM) attacks.

• Modern OS Integration: Fully compliant with Android 11+ Scoped Storage, interacting with the filesystem via the OS-brokered Storage Access Framework (SAF).

Comprehensive Document Support, Simplified

Reagon File Reader is your all-in-one document viewer and file opener, supporting a wide array of formats with precision and speed:

• PDF Reader: Fast and efficient viewing with predictive prefetching.

• DOCX Reader (Word): Seamlessly open and view Word documents.

• XLSX Reader (Excel): Access your spreadsheets with aggressive row-capping for stability.

• PPTX Reader (PowerPoint): View presentations with text extraction and memory-safe image handling.

• CSV Reader: Robust parsing with automatic delimiter detection and embedded newline handling.