Gamma Watermark Remover

A local web tool to strip the "Made with Gamma" branding from PDF and PowerPoint (.pptx) files exported from gamma.app free accounts.

It runs a FastAPI backend that parses the document structure to identify and remove specific watermark elements based on coordinates and object properties.

Functionality

• PDF: Scans pages using PyMuPDF (fitz) for images linked to the gamma.app domain located in the bottom-right corner.
• PPTX: Uses python-pptx to parse the presentation. Since Gamma embeds the watermark in the Slide Layouts (masters) rather than individual slides, the script targets the master layouts to remove the branding globally across the presentation.

Setup

Requires Python 3.7+.

1. Clone the repo:

   git clone https://github.com/username/gamma-watermark-remover.git
   cd gamma-watermark-remover

2. Install dependencies:

   pip install -r requirements.txt

3. Run the server:

   python app.py

4. Go to http://localhost:8000 in your browser.

Technical Notes

The detection logic is heuristic-based:

• PPTX: Checks prs.slide_layouts. If a shape contains a hyperlink to gamma.app and is positioned beyond the 70% mark of the slide width/height, it gets deleted.
• PDF: Iterates through page objects. If a clickable image points to the Gamma domain, the object is removed from the drawing stream.

If Gamma changes their export coordinates or DOM structure, the coordinate offsets in utils.py (or wherever logic resides) will need to be updated.

Dependencies

• fastapi / uvicorn - Web server
• pymupdf - PDF processing
• python-pptx - PowerPoint manipulation
• python-multipart - For file uploads

Disclaimer

This tool is for educational purposes only. I am not affiliated with Gamma. Please consider upgrading to their paid tier if you use the software for professional work.