.PDN File Extension

paint.net Image

Developer Rick Brewster
4.0  |  58 Votes

What is a PDN file?

A PDN file is a bitmap image created by paint.net, a free image-editing program for Windows. It contains an image as well as a record of the layers, effects, text, and other items applied to that image. PDN files are similar to Adobe Photoshop Documents (.PSD files).

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Screenshot of a .pdn file in paint.net
PDN file open in paint.net

Paint.net is an image and photo editor that allows Windows users to add effects, adjustments, layers, text, and shapes to their images. If a user wants to retain a record of the edits and additions they've made to an image, they can save the image as a PDN file (by selecting File → Save As... and selecting PDN in the Save as type: field).

Saving an image as a PDN file allows users to continue editing that image's layers and effects as needed. In contrast, saving an image to any of the other file formats paint.net supports will flatten it, compressing all the image's layers into one.

How to open a PDN file

You can open a PDN file in paint.net (Windows). To do so, select File → Open... from the program's menu bar. Then, navigate to and open your PDN file.

How to convert a PDN file

You can use paint.net's File → Save As... feature to convert PDN files to the following image formats:

  • .PNG - Portable Network Graphic
  • .JPEG - JPEG Image
  • .BMP - Bitmap Image
  • .TIFF - Tagged Image File Format
  • .GIF - Graphical Interchange Format
  • .TGA - Targa Graphic
  • .DDS - DirectDraw Surface Image
  • .JXR - JPEG XR Image
  • .HEIC - High Efficiency Image Format
  • .AVIF - AVIF Image
  • .WEBP - WebP Image
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Programs that open PDN files

Portable Draughts Notation File

Developer Wieger Wesselink
3.3  |  6 Votes

A PDN file may also be a game data file that stores a recorded draughts game (known as "checkers" in America) in the Portable Draughts Notation (PDN) standard. It stores plain text information, which includes each move made by the players and game metadata, such as when the game was played and who played it.

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Screenshot of a .pdn file in Dragon Draughts 4.5
PDN file open in Dragon Draughts 4.5

Draughts is a two-player board game that involves diagonal moves and jumping over opposing pieces. Internationally, the game is called draughts and is typically played on a 10x10 board. In America, draughts is more commonly referred to as checkers and played on an 8x8 board.

Draughts players compete online in tournaments with other players through draughts programs that record and save the matches. The PDN file format is the most common type for storing recordings of games. Players can replay games with a Draughts program that supports the PDN format.

What is the PDN format?

The PDN file format typically consists of two sections. One section is made up of key-value pairs that store metadata about the recorded game and the other section stores the recorded moves for the game:

  1. Game metadata - includes the event when the game was played, the location where it was played, the date of the game, players involved, game result, and cumulative time each player used to play
  2. Recorded moves - Includes the move number, the space that the piece moved from, and the space that the piece moved to
Steven J. Edwards developed the original PDN format and released it in 1993. Other programmers in the draughts community subsequently developed and released 2.0 and 3.0 versions of PDN.

How to open a PDN file

You can open PDN files with various draughts programs, including Dragon Draughts (Windows) and Checkersland (multiplatform). These programs replay the moves recorded in the game and display information about the game.

Since PDN files are saved in plain text, you can also open them with text editors, such as Microsoft Notepad (Windows), Apple TextEdit (macOS), and Microsoft Visual Studio Code (multiplatform). These options are useful for modifying the recorded game stored in a PDN file.

NOTE: Keep in mind, text or source code editors display PDN files as plain text and do not replay the recorded game.

Programs that open PDN files

Checkersland  —  Discontinued
Checkersland  —  Discontinued
Checkersland  —  Discontinued

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