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Paint.NET

paint.net
Paint.net logo.png
Paint.net 4.0.6 screenshot.png
paint.net version 4.0.6
Original author(s) Rick Brewster
Developer(s) dotPDN, LLC
Initial release May 6, 2004; 12 years ago (2004-05-06)
Stable release
4.0.13 / December 12, 2016; 2 months ago (2016-12-12)
Written in C#, C++
Operating system Windows 7 SP1 or later
Platform .NET Framework 4.6
Size 6.7 MB
Available in 21 languages
Type Raster graphics editor
License Freeware
Website getpaint.net

paint.net (sometimes stylized as Paint.NET) is a freeware raster graphics editor program for Microsoft Windows, developed on the .NET Framework. paint.net was originally created by Rick Brewster as a Washington State University student project, and has evolved from a simple replacement for the Microsoft Paint program into an editor with support for layers, blending, transparency, and plugins.

paint.net is primarily programmed in the C# programming language. Its native image format, .PDN, is a compressed representation of the application's internal object format, which preserves layering and other information. Excluding the installer, text, and graphics, paint.net was released under a modified version of the MIT License. It was initially released as completely open source, but due to breaches of license, all resource files (such as interface text and icons) were released under a Creative Commons license forbidding modification, and the installer was made closed-source.

Version 3.36 was initially released as partial open source, but the sources were later removed by Brewster, citing problems with plagiarism. In version 3.5, the license was altered to reflect this, and users are now prohibited from modifying the software. As free licenses cannot be revoked, developers can still legally develop forks based on version 3.36 and earlier.

paint.net originated as a computer science senior design project during spring 2004 at Washington State University. Version 1.0 consisted of 36,000 lines of code and was written in fifteen weeks. In contrast, version 3.35 has approximately 162,000 lines of code. The paint.net project continued over the summer and into the autumn 2004 semester for both the version 1.1 and 2.0 releases.


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