NotebookLM Watermark Remover is an online tool focused on removing watermarks from PDF files generated by NotebookLM. Its importance lies in helping users obtain watermark-free, more professional PDF files. Key advantages include fast operation, which allows instant watermark removal; high security, providing data protection for users; and ease of use, allowing even non-professionals to easily handle it. The product background was developed to meet the demand for watermark-free PDF files. From the page information, it is known that the upload and preview functions are free, but it is not mentioned whether downloading is收费, so it is temporarily classified as a free tool.