Paint.NET is image and photo manipulation software designed to be used on computers that run Windows XP or 2000. Paint.NET is jointly developed at Washington State University with additional help from Microsoft, and is meant to be a free replacement for the MS Paint software that comes with all Windows operating systems.

The programming language used to create Paint.NET is C#, with GDI+ extensions.

Paint.NET has many of the powerful features that expensive commercial applications have, including the ability to use layers.

Requires Microsoft .NET Framework 2.0.

What's New in version 3.36:

• Improved: Effect rendering should be a little faster now.
• Changed: Implemented some changes to the "Add Noise" effect that were suggested by a forum member.
• Changed: The canvas background color is now always #c0c0c0.
• Changed: The auto-updater should now correctly detect .NET 3.5 and newer, which will help to save bandwidth when Paint.NET v4.0 is released (it will require .NET 3.5).
• Fixed: Paint.NET now works on a system that has the .NET 3.5 SP1 "Client Profile" installed.
• Fixed: When zoomed in and the cursor is to the top-left of the image (negative coordinates), the ruler is now highlighted in the correct area.
• Fixed: The effect rendering system no longer sets the "Tag" property on the configuration dialog.
• Fixed: Some incorrectly authored plugins would cause a crash when loading their support details (author, copyright, etc.).
• Fixed: There was a bug in the color wheel for IndirectUI that caused it to show the wrong values at initialization.
• Fixed: There was a performance problem for effects that used the IndirectUI color wheel control.
• Fixed: In some rare cases, Paint.NET would crash while shutting down.
• Fixed: When using the "Fixed Ratio" feature of the Rectangle Selection tool, it would crash if 0 was specified for both the width and height.