How can I add logo watermark in pdf file on Windows 11?

[Windows Server]

Hi everyone, I'm indie author who is just getting started. I recently finished an ebook and would like to add my personal logo as a watermark or cover element in my own PDF version. However, I'm not too familiar with PDF editing tools, and the tutorials I found online are either complicated in terms of steps or require paid software, which I'd prefer to add logo watermark in pdf in a free or low-cost way.

I insert the logo paste in Word and then converted to PDF, but the results in typographical errors;
And the file size is too large by doing this with online pdf watermark tools. Although I know that this may be a basic problem, but I really do not have a clue. I implore you to share how to do this.

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