# Unpaywall - Chrome Extension Security Audit & Unpacked ZIP Download

> **CRX8 Security Inspection & Official Download Hub**  
> **Category**: Academic & Research | **Version**: 3.9.8 | **Rating**: 4.7 / 5.0 (2900 ratings) | **Users**: 500,000+  
> **Safety Score**: 9.9 / 10 (非营利公益 · 极佳安全)  
> **Updated**: 2026年6月10日 | **Package Size**: 320 KiB  
> **Official Page**: https://crx8.com/ext/unpaywall

## Overview & Verified Verdict
Verified Academic & Research extension. Security Score: 9.9/10, Rating: 4.7★ (2900 reviews).

## Permissions & Manifest Security Audit
- **Security Score**: 9.9 / 10
- **Auditor Verdict**: Low risk. Full compliance with Chrome Web Store MV3 guidelines.
- **Manifest Permissions**: [{"perm":"storage","desc":"保存偏好设置","risk":"低"}]

## Key Features & Highlights
- 自动识别 DOI 论文标识码并在页面右侧显示绿色解锁小挂件
- 实时索引全球 50,000+ 高校机构知识库、预印本平台(arXiv)与作者合规开放副本
- 一键直达官方合法开放获取 (Open Access) 完整 PDF 资源
- 非营利背景，绝无违规侵权风险，受全球顶级大学图书馆一致推荐

## Pros & Cons
### Pros
- 100% 合法合规，避免版权纠纷
- 极度轻巧安静，只有当检测到可用全文时才会点亮绿色解锁挂件
- 全球覆盖超 3000 万篇论文公开全文

### Cons
- 对于部分极其封闭且作者从未发布预印本的商业期刊无法找到全文

## Recommended Alternatives
- Sci-Hub Now!: 备用镜像路由，但存在部分地区学术版权争议
- Zotero Connector: 侧重于将文献元数据及附件导入本地文献库

## Direct Download (Official Google Stream)
- **Native CRX Format (Official Source)**: [Download .crx](https://crx8.com/download/unpaywall.crx)
- **Unpacked ZIP Format (Load Unpacked)**: [Download .zip](https://crx8.com/download/unpaywall.zip)


## How to Install Unpacked Extension (.ZIP)
1. Download the `.zip` archive above and extract it to a local folder;
2. Open Chrome or Edge browser, navigate to `chrome://extensions`, and enable **Developer mode** in the top right;
3. Click **Load unpacked** in the top left, and select the extracted folder to run immediately.