Is there a NotebookLM watermark remover?

Yes. There are several tools that remove the NotebookLM watermark from exported files:

Kaptex NotebookLM Watermark Remover (free, browser-based) The Kaptex Watermark Remover at kaptex.com/notebooklm-watermark-remover supports PDF, PPTX, and PNG exports. Drag your file in, click Remove, and download the clean version. No signup required. Processing is 100% in your browser — nothing is uploaded to any server.

Open-source option (GitHub) The watermark removal logic is based on the open-source slideclean project by aaronyang-ai, available on GitHub. If you prefer a self-hosted or command-line option, the repository is publicly available.

Manual tools - Canva — import your PDF or PPTX, delete the watermark element per slide, re-download - Microsoft Word — open the PDF in Word, the watermark appears as an editable object you can click and delete

For most users, the Kaptex tool is the fastest option — it removes watermarks from all pages at once without any manual work per slide.