Is Glasp Web Highlighter: PDF & Web Highlight Safe? — Extension Safety Profile

This extension requests broad host permissions (*://*/*) along with activeTab, contextMenus, tabs, and storage. In practice, that means it can read and modify content on any website you visit, add items to your right-click menu, and store data locally. For a web and PDF highlighter, such access is typical because it needs to inject highlighting scripts and save annotations across all pages. However, the scope is significant: it can technically see everything you type or view on any site, including sensitive information.

Productivity tools like highlighters often require extensive page access, so a careful user should consider what data is being collected. The developer declares that it collects personally identifiable information and website content, but states this data is not sold or used for unrelated purposes. While these self-declarations are positive, users should still review the privacy policy to understand exactly what is gathered and how it is stored.

The fact sheet shows a strong Maintenance & Ownership score, indicating the extension is actively updated and its ownership is clear, which reduces the risk of it becoming an abandoned or hijacked tool. The weakest dimension is Publisher & Identity, suggesting limited transparency about the company behind it. Combined with a high community reputation, this paints a picture of a functional, well-liked tool where the main caution lies in the breadth of data access rather than any specific red flag.