GPT Web Highlighter

GPT Web Highlighter adds a highlighting layer on top of ordinary web pages. Rather than asking you to select sentences by hand, it can run in an automatic mode that surfaces what appears to be the key content, letting you scan long articles, documentation, or research pages much faster. A manual mode gives you direct control through an on-page button, so you can mark passages yourself exactly as you like. A third mode simply turns everything off when you want the original page back.

The extension is deliberately small and simple. It installs from the Chrome Web Store, shows up as a toolbar icon, and works while you read instead of requiring you to copy text into a separate app. Its stated purpose is to support reading on the web, and along the way it may collect personally identifiable information, financial or payment information, and page content according to the developer's disclosure.

It is a niche, independent tool maintained by a single developer. Rules for how pages are detected and highlighted are built in, and there is no account, no subscription, and no cloud dashboard to manage. That makes it easy to try and easy to remove if it does not fit your reading habits.