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remove-gemini-watermark

★ 15 Open GitHub ↗

Remove watermarks from Gemini's nano banana, Free watermark remover tool to clean up watermarked photos instantly in your browser.

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# Gemini Watermark Remover (Banana Remove) lol idk

**client-side tool for cleaning Gemini-generated imagery.**

[Live Demo](https://nicholasxdavis.github.io/banana-remove/) • [Report Bug](https://github.com/nicholasxdavis/banana-remove/issues) • [Request Feature](https://github.com/nicholasxdavis/banana-remove/issues)

[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
[![Tech Stack](https://img.shields.io/badge/Stack-Alpine.js%20%7C%20Tailwind-yellow)](https://github.com/nicholasxdavis/banana-remove)

</div>

<br />

<div align="center">
  <h3>Before & After</h3>
  <div style="display:flex; justify-content:center; gap:16px;">
    <img src="https://github.com/user-attachments/assets/9f59a2ed-0aea-40e7-acb6-c8f5446b1926" width="45%" alt="Watermarked Image" />
    <img src="https://github.com/user-attachments/assets/03c72737-b319-44e0-a555-a23bfb32756f" width="45%" alt="Cleaned Image" />
  </div>
</div>

<br />

## About

**Gemini Watermark Remover** (also known as Banana Remove) is a lightweight web application designed to automatically detect and remove the specific watermarks found on images generated by Google's Gemini models.

Unlike other tools that rely on heavy server-side processing or diffusion models, this project runs **100% in the browser**. It utilizes a ported `WatermarkEngine` that performs reverse alpha blending using pre-calculated alpha maps to mathematically subtract the watermark without destroying the underlying pixel data.

## How It Works

The core logic resides in `js/watermark-remover.js`. The removal process follows these steps:

1.  **Alpha Map Generation:** The engine loads reference background patterns to calculate the precise alpha channel values of the watermark.
2.  **Reverse Blending:** It iterates through the pixels in the watermark's bounding box.
3.  **Restoration:** Using the formula `original = (watermarked - alpha * LOGO_VALUE) / (1 - alpha)`, it restores the original pixel color values that were obscured by the semi-transparent watermark.

## Credits

This project builds upon the research and logic provided by the open-source community:

* **[GeminiWatermarkTool](https://github.com/allenk/GeminiWatermarkTool)** by [Allen K](https://github.com/allenk) - Special thanks for the original logic on watermark detection and reverse alpha blending.

remove-gemini-watermark

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