To ensure security, only download plugins from the official Paint.NET Forum .

: Copy the area, paste it as a new layer, and merge it down to fill in semi-transparent gaps. How to Install Plugins Download the .dll file from the Paint.NET Forums.

: It is often used to fix "almost-opaque" sections inside a shape or to prepare images for file formats that do not support transparency. How to Download and Install

You can locate the dedicated thread and download link on the official Paint.NET Forum for Remove Transparency BoltBait’s Plugin Pack What it does:

To download and install the plugin, follow these steps: