Nullgen AI Blocker

Nullgen AI Blocker

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Introduction
Nullgen is a free, on-device browser extension that blocks generative AI prompts on any website.
Listed on
September 8, 2026
FreeBrowser ExtensionAI Plugins & ExtensionsAI Browser Extensions
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What is Nullgen AI Blocker?

Nullgen AI Blocker is a free browser extension that prevents users from typing or pasting text into AI chat prompt boxes on any website. It works on-device, meaning no prompt data is uploaded or stored. The extension automatically detects AI chat inputs across websites, including new assistants, and blocks input at the keyboard level.

How to use Nullgen AI Blocker?

  • Install the extension from your browser's store (Chrome, Edge, Firefox, Safari). Once installed, it starts working immediately with no configuration or sign-up. The extension automatically recognizes AI chat inputs on pages and blocks text entry into those fields. For Pro features, you can sign up for a trial and manage users, devices, and policies via an admin dashboard.

Core features of Nullgen AI Blocker

  • Blocks typing and pasting into AI chat inputs on any website
  • 100% on-device detection, no prompt data collected
  • Works automatically on new AI assistants without blocklists
  • No account or sign-up required for free version
  • Compatible with Chrome, Edge, Firefox, and Safari
  • One-minute setup with no proxy or network changes
  • Pro adds admin dashboard, policy sync, and enforcement pinning

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