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Lark PDF Reader

A complete PDF reader and editor
for Android, fast, secure, and lightweight.

Key Features

Everything You Need
in One App

Read, edit, manage, and secure PDF documents
easily and efficiently.

  • Page rendering, reading modes, full navigation
  • Text editing, annotations, and form filling
  • Redact & protect PDFs with encryption
  • Convert PDF to Word, split & merge files
  • OCR & on-device translation
  • Read aloud (TTS) and document scanning

Architecture & Technology

Reliable PDF Engine
with Modern Technology

Powered by Lark Engine, a custom-built native
PDF engine that is secure, stable, and fast.

  • Kotlin
  • C++
  • PDFium
  • qpdf
  • ML Kit
  • UI & Features
  • Data Layer
  • Tools & AI

Lark PDF Reader

:appAndroid App
(Jetpack Compose)
:engineLark Engine
(Isolated Process)
  • PDFium + qpdf
  • ML Kit
  • Play Billing
    (Donations)

Lark PDF Reader

v1.0 Target: September 2027

A project from Larkon Technologies,
for better productivity.