https://github.com/oooooooo/gemmary

A Chrome userscript to summarize any web page on-device using built-in Gemini Nano — no API key, no server.
https://github.com/oooooooo/gemmary

gemini-nano-in-chrome summarizer userscript

Last synced: 11 days ago
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A Chrome userscript to summarize any web page on-device using built-in Gemini Nano — no API key, no server.

• Host: GitHub
• URL: https://github.com/oooooooo/gemmary
• Owner: oooooooo
• License: isc
• Created: 2026-05-23T06:51:01.000Z (28 days ago)
• Default Branch: main
• Last Pushed: 2026-05-23T07:09:26.000Z (28 days ago)
• Last Synced: 2026-05-23T08:29:51.866Z (28 days ago)
• Topics: gemini-nano-in-chrome, summarizer, userscript
• Language: JavaScript
• Homepage: https://raw.githubusercontent.com/oooooooo/gemmary/main/gemmary.user.js
• Size: 8.79 KB
• Stars: 0
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE
  • Agents: AGENTS.md

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README

          
# Gemmary

[![Install userscript](https://img.shields.io/badge/Install-userscript-blue)](https://raw.githubusercontent.com/oooooooo/gemmary/main/gemmary.user.js) ![Chrome only](https://img.shields.io/badge/Chrome-138%2B_only-blue?logo=googlechrome)

Gemmary (/ˈdʒɛməri/) — a portmanteau of **Gemini Nano** and **summary** — is a

Chrome-only userscript that summarizes any web page on-device using Chrome's

built-in Summarizer API. No API key, no server, no data leaving your machine.

The output language follows your browser's language setting — Japanese for `ja`,

English for everything else. To add more languages, edit the `LANG_*` and

`LABELS` constants near the top of the script.

## Requirements

- Chrome 138+

- [Tampermonkey](https://www.tampermonkey.net/) extension

## Installation

1. Install [Tampermonkey](https://www.tampermonkey.net/).

2. Enable the required Chrome flags:

   - `chrome://flags/#summarization-api-for-gemini-nano` → **Enabled**

   - `chrome://flags/#optimization-guide-on-device-model` → **Enabled BootstrapSentinel**

3. Restart Chrome, then go to `chrome://components` and update

   **Optimization Guide On Device Model**.

4. Open the raw script URL and click **Install**:

   ```text

   https://raw.githubusercontent.com/oooooooo/gemmary/main/gemmary.user.js

   ```

## Usage

Click the Gemini icon button in the bottom-right corner of any page. A modal

opens with four summary formats: **Key Points**, **TL;DR**, **Teaser**, and

**Headline**. Press **Esc** or click outside to close.

## License

ISC