GrapheneOS/PdfViewer
Simple Android PDF viewer based on pdf.js and content providers. The app doesn't require any permissions. The PDF stream is fed into the sandboxed WebView without giving it access to content or files. CSP is used to enforce that the JavaScript and styling properties within the WebView are entirely static.
Star History
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+26
STARS · LAST 30 DAYS
1
PER DAY
#201
MOST-STARRED Kotlin
| Window | 7 days | 30 days | 90 days |
|---|---|---|---|
| Stars gained | +7 | +26 | +90 |
| Per day | 1 | 1 | 1 |
| Forks gained | +1 | +3 | +10 |
PdfViewer gained 26 stars in the last 30 days, about 1 a day, and now has 1K. It is about 10 years old and has averaged roughly 105 stars a year. It ranks #201 among Kotlin repositories and #4,997 across all languages on GitHubRepo.
Trending Record
3
DAYS ON TRENDING
#5532
BEST RANK
Oct 6, 2026
FIRST APPEARANCE
Active
STATUS TODAY
PdfViewer has maintained a continuous presence across global trending indexes, peaking at #5532. Below is the 30-day activity profile:
💡 Overview
PdfViewer is an open-source project written in Kotlin: Simple Android PDF viewer based on pdf.js and content providers. The app doesn't require any permissions. The PDF stream is fed into the sandboxed WebView without giving it access to content or files. CSP is used to enforce that the JavaScript and styling properties within the WebView are entirely static.
Engineered for speed, consistency, and developer ease, it solves common hurdles in android, grapheneos, pdf. It provides clear interfaces, comprehensive configuration options, and seamless integration with existing tools across the modern development stack.
⚡ Key Features
Optimized execution pipeline written in Kotlin for predictable speed.
Zero-friction configuration with comprehensive sensible defaults out of the box.
Cross-platform runtime support across Linux, macOS, and Windows environments.
Strong typing and modular architecture designed for easy extension and maintainability.
Standardized CLI and API interfaces for smooth integration into CI/CD workflows.
Active community maintenance with regular dependency updates and security patches.
📥 Installation
$ git clone https://github.com/GrapheneOS/PdfViewer.git
cd PdfViewer⚙ System Requirements
Platforms
- • macOS
- • Linux
- • Windows
Runtime & Dependencies
JDK 17+, Kotlin compiler >= 1.9
Architecture
x86_64, ARM64 (Apple Silicon & Graviton)
🧠 How It Works
PdfViewer coordinates its core functionality through a modular Kotlin pipeline. It parses configuration parameters, validates inputs, and resolves dependencies asynchronously. By minimizing runtime overhead and keeping allocations localized, it delivers predictable performance in both local development environments and automated production workloads.
🎯 Production Use Cases
Production System Integration
Embed PdfViewer into Kotlin backend services to handle core application logic.
CI/CD Automated Pipelines
Run automated validation, builds, and integration suites during deployments.
Developer Tooling & Workflows
Accelerate developer onboarding with pre-configured project utilities.
Open Source Extension
Fork and customize internal modules under the repository's open MIT license.
🚀 Getting Started
Install PdfViewer using your package manager: `git clone https://github.com/GrapheneOS/PdfViewer.git`
Initialize your project workspace or configuration file for PdfViewer.
Import PdfViewer into your codebase or invoke it directly from your terminal.
Execute your test suite or run `PdfViewer --help` to verify successful setup.
👍 Strengths
⚠️ Considerations
⇄ Alternatives & Direct Competitors
👥 Who Should Use This
Developers and engineering teams building with Kotlin, seeking reliable, tested, and actively maintained tooling for production workloads.
🏆 Nearby in the Rankings
GrapheneOS/PdfViewer is currently ranked #4,997 by stars across every repository tracked on GitHubRepo. These are adjacent projects:
| Rank | Repository | Language | Stars | Action |
|---|---|---|---|---|
| #4,992 | radar/by_star | Ruby | ★ 1K | Compare ↗ |
| #4,992 | defunkt/cijoe | Ruby | ★ 1K | Compare ↗ |
| #4,992 | backdrop/backdrop | PHP | ★ 1K | Compare ↗ |
| #4,992 | microsoft/testfx | C# | ★ 1K | Compare ↗ |
| #4,992 | OnlistTeam/ai-manager | Rust | ★ 1K | Compare ↗ |
| #4,997 | GrapheneOS/PdfViewer This Project | Kotlin | ★ 1K | |
| #4,997 | licensee/licensed | Ruby | ★ 1K | Compare ↗ |
| #4,997 | cloudflare/pint | Go | ★ 1K | Compare ↗ |
| #5,000 | uzbl/uzbl | C | ★ 1K | Compare ↗ |
| #5,000 | simpligility/android-maven-plugin | Java | ★ 1K | Compare ↗ |
| #5,000 | jowilf/starlette-admin | Python | ★ 1K | Compare ↗ |
Frequently Asked Questions
What does PdfViewer do? +
Simple Android PDF viewer based on pdf.js and content providers. The app doesn't require any permissions. The PDF stream is fed into the sandboxed WebView without giving it access to content or files. CSP is used to enforce that the JavaScript and styling properties within the WebView are entirely static.
What language is PdfViewer written in? +
The primary language is Kotlin. Topics include: android, grapheneos, pdf, pdf-viewer, pdfjs.
Is PdfViewer actively maintained? +
Yes, the last recorded push was on Oct 5, 2026 with 51 open issues being tracked.
How many stars does PdfViewer have? +
PdfViewer has 1,046 stars and 144 forks on GitHub.
How does PdfViewer rank among GitHub repositories? +
With 1,046 stars, GrapheneOS/PdfViewer is ranked #4,997 globally across all repositories tracked on GitHubRepo and #201 among Kotlin projects.
What license is PdfViewer distributed under? +
The repository reports a MIT license. Always verify the repository LICENSE file for legal terms.
