Paint.NET is free image and photo editing software for computers that run Windows. It features an intuitive and innovative user interface with support for layers, unlimited undo, special effects, and a wide variety of useful and powerful tools.

Features
- Simple, intuitive, and innovative user interface
Every feature and user interface element was designed to be immediately intuitive and quickly learnable without assistance.
- Layers
Usually only found on expensive or complicated professional software, layers form the basis for a rich image composition experience.
- Special Effects
Many special effects are included for enhancing and perfecting your images. Everything from blurring, sharpening, red-eye removal, distortion, noise, and embossing are included. Also included is our unique 3D Rotate/Zoom effect that makes it very easy to add perspective and tilting.
- Frequently Updated
Updates usually come about every 4 to 6 weeks, and contain new features, performance improvements, and bug fixes.
- Active Online Community
Paint.NET has an online forum with a friendly, passionate, and ever-expanding community.
- Powerful Tools
Paint.NET includes simple tools for drawing shapes, including an easy-to-use curve tool for drawing splines or Bezier curves.
- Unlimited History
Everybody makes mistakes, and everybody changes their mind. To accommodate this, every action you perform on an image is recorded in the History window and may be undone.
- Open Source and Free
Paint.NET is provided free-of-charge, and the source code (all 140,000+ lines of it) is also available for free under generous licensing terms.