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Quick Start

Describe what you want your extension to do, and Extensy generates fully compliant Manifest V3 code ready to load in Chrome. Follow these steps to go from prompt to a working extension.
1

Write your prompt

Navigate to the Extensy Assistant and describe your extension in plain English. Be specific about the action, the target site, and any UI you want.Example prompt: “A tool that highlights price tags on any website and converts them to my local currency.”
2

Review the generated code

Extensy generates all necessary files — manifest.json, content.js, background.js, and a popup UI. Review the output in the editor and make any manual adjustments you need before exporting.
If the first result isn’t quite right, refine your prompt and click Regenerate. Each generation costs one credit.
3

Export the ZIP

Click the Export button in the top-right corner. Extensy packages all your extension files into a single, store-ready ZIP archive and downloads it to your machine.
4

Unzip the package

Locate the downloaded ZIP file and extract its contents into a dedicated folder. Keep this folder somewhere easy to find — Chrome needs to reference it when loading the extension.
5

Load the extension in Chrome

  1. Open a new tab and navigate to chrome://extensions.
  2. Toggle Developer mode on using the switch in the top-right corner.
  3. Click Load unpacked.
  4. Select the folder you extracted in the previous step.
Do not move or delete the unzipped folder after loading. Chrome reads the extension directly from that location. Moving it will break the installation.
6

Test your extension

Your extension card now appears in the chrome://extensions list. Pin the extension icon to your toolbar by clicking the puzzle-piece icon and selecting the pin.Navigate to a webpage that matches your prompt and verify the extension behaves as expected.

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Next steps

Your first extension is running. Now learn how to write better prompts and manage data across sessions.

Prompting Guide

Learn how to write prompts that produce more capable and reliable extensions.

Storage and State

Persist user preferences and data across extension sessions using the Chrome Storage API.

Core Concepts

Understand the generation pipeline, Manifest V3, and how credits work.

AI Assistant

Ask our in-page AI assistant any question about extension development.