How do I remove watermark from PDF on a Windows PC?

PDFs come with watermarks and this is a common case as far as I know. Fortunately, there are many easy and free ways to remove watermarks from PDF files. Please don't do this with the PDF editor software, such as Adobe Acrobat. Here are the reasons:

1. Limited ability to deal with translucent watermarks
Adobe Acrobat's “Eraser” or “Marker Tool” is mainly designed for solid-color watermarks, if the watermark is a semi-transparent overlay layer, direct erasure will lead to the underlying text fuzzy or edge of the residual traces of the obvious. Professional watermarking tools can analyze the pixel transparency layer repair, which is difficult to achieve Acrobat.

2. Rely on manual operation and inefficient
If the document contains dozens of pages of watermarks, manually selecting the watermark area page by page will take a lot of time. In contrast, code-based automatic detection or batch processing tools can significantly improve efficiency, especially for batch processing of tutorials PDF documents.

3. Payment threshold and functional limitations
Adobe Acrobat's complete watermarking features are limited to paid subscription users (such as Acrobat Pro DC), while the free version of the function is severely limited. For programming enthusiasts, the use of open source libraries (such as pdfplumber + Pillow) or low-cost tools can meet the demand, but also to avoid paying for commercial software.

Please go with a more user-friendly and lightway solution to remove PDF watermarks on Windows PC.