How to Remove Watermarks and Fix Chinese Text in NotebookLM‑Generated PPTs

Many users notice that PPTs generated by NotebookLM often contain a watermark in the lower‑right corner, and the Chinese characters may appear garbled or blurry. The article proposes a "combo" solution to address both issues.

Step 1: Remove the watermark. Upload the PDF version of the NotebookLM PPT to SlideDeckCleaner (https://www.slidedeckcleaner.com/zh/). The service processes the file in a few seconds and provides a clean PDF without the watermark.

Step 2: Fix Chinese text and improve image quality. Use the AI PPT conversion tool at https://aippt.wps.cn/aippt/convert-ppt/home?request_source=header. Upload the cleaned PDF (or the original NotebookLM PPT) and let the service perform OCR and conversion.

The tool extracts most pages into editable PPT slides, converts unclear text into pure text that can be edited, and automatically extracts images. Most of the extracted text is ready for second‑stage editing.

If certain images remain unprocessed, you can download the problematic image separately, upload it again to the conversion service, and then merge the resulting PPT with the rest of the slides.

The underlying principle is that the service first identifies different elements on each page, applies OCR to extract text, and then re‑lays out the text and images into PPT format, making the content editable and the images replaceable.

For further reading, see the related article "Your NotebookLM isn’t working? The truth is you got the first step wrong" (https://mp.weixin.qq.com/s?__biz=Mzg3NzI0MzAyNA==∣=2247490601&idx=1&sn=78767056488a178f6619a582f4617d1e&scene=21#wechat_redirect).