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Gemini & NotebookLM Watermark Cleaner

A privacy-first, browser-based tool for removing watermarks from Gemini and NotebookLM generated content (Images & PDFs). Built with vanilla JavaScript, featuring mathematical precision for lossless restoration and robust fallback cloning for complex document formats.

✨ Features

• Multi-Format Support: Handles standard Gemini Images (.jpg, .png, .webp) and NotebookLM documents (.pdf).
• Lossless Restoration: Uses Reverse Alpha Blending for standard Gemini images to perfectly restore original pixels without blurring.
• Smart Cloning: Applies intelligent Simple Clone (patching) for NotebookLM headers/footers and PDF slides where alpha maps don't apply.
• Privacy-First: 100% client-side processing. No files are ever uploaded to any server.
• Batch Processing: Process multiple files at once and download them as a ZIP archive.
• Modern UI: Dark/Light mode support with a clean, responsive interface.
• PDF Preview: Real-time progress tracking and preview for PDF file cleaning.

🛠️ Technology Stack

• Core Logic: Vanilla JavaScript (ES Modules)
• PDF Processing: pdfjs-dist (Parsing) & jspdf (Re-generation)
• UI Styling: Tailwind CSS (CDN)
• Packaging: esbuild for bundling

🧩 How It Works

This tool employs two distinct strategies depending on the content type:

1. Reverse Alpha Blending (for Gemini Images)

Gemini applies watermarks using a standard alpha compositing formula:

Pixel_{watermarked} = \alpha \cdot Pixel_{logo} + (1 - \alpha) \cdot Pixel_{original}

We reverse this to recover the original pixel:

Pixel_{original} = \frac{Pixel_{watermarked} - \alpha \cdot Pixel_{logo}}{1 - \alpha}

By using pre-calibrated Alpha Maps (48px/96px), we can mathematically restore the original pixel values with near-zero loss.

2. Smart Cloning (for NotebookLM & PDF)

For NotebookLM's strip-like watermarks or PDF slides where exact alpha maps vary, the tool uses a Simple Clone technique. It identifies the watermark region and intelligently "clones" a patch of pixels from the immediate neighborhood (e.g., just above the watermark) to cover it, blending the edges for a seamless look.

🔗 Attribution & References

This project is built upon the excellent work of the open-source community. Special thanks to:

• Original Project: gemini-watermark-remover by journey-ad.

  • Base architecture, alpha map logic, and core "Reverse Alpha Blending" implementation.

• Algorithm Origin: Gemini Watermark Tool by Allen Kuo.

  • Original discovery of the math and watermark masks.

🚀 Usage

Development

1. Clone the repository:

   git clone http://git.unissense.tech/mula/gemini_watermark_cleaner.git
   

2. Install dependencies:

   pnpm install
   

3. Start development mode (rebuilds on changes):

   pnpm dev
   

4. Start a local preview server:

   pnpm serve
   

5. Build for production:

   pnpm build
   

Docker Deployment

1. Build and run the container:

   docker-compose up -d --build
   

2. The application will be available at http://localhost:3000 (or the port specified in .env).

Browser

Simply open the dist/index.html (after building) or the deployed site. Drag and drop your files.

• Images: Instant preview and cleaning.
• PDFs: Shows progress per page, then displays the cleaned first page.

📄 License

MIT License