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PNJ File - What is a .pnj file and how do I open it?

Learn about .PNJ files and view a list of programs that open them.

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What is a PNJ file? A PNJ file is an image saved in the Portable Network JPEG (PNJ) format. PNJ files are similar to normal .JPG files, in that they contain image data compressed using lossy compression. However, unlike typical JPGs, PNJ files can contain transparent sections.

More Information The PNJ format is a hybrid of the .PNG and JPEG formats. Each PNJ file contains JPEG-encoded image data saved within a PNG container. This allows PNJ files to include an alpha channel, like PNG files, while still being compressed using lossy compression (reducing their file size in comparison to PNG files). The PNG Development Group created the PNJ format for use alongside the .MNG (Multiple-Image Network Graphic) format. Each MNG file can be comprised of multiple PNJ files, used to show an animation. However, both MNG files and PNJ files are quite uncommon. Thus, most image viewers and editors cannot open PNJ files. NOTE: During development of the MNG format, the PNG Development Group renamed the PNJ format to the JPEG Network Graphic ( .JNG ) format.

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DeveloperPNG Development Group
Popularity2.6 | 8 Votes

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.PNJ File Extension

Portable Network JPEG Image

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What is a PNJ file?

A PNJ file is an image saved in the Portable Network JPEG (PNJ) format. PNJ files are similar to normal .JPG files, in that they contain image data compressed using lossy compression. However, unlike typical JPGs, PNJ files can contain transparent sections.

More Information

The PNJ format is a hybrid of the .PNG and JPEG formats. Each PNJ file contains JPEG-encoded image data saved within a PNG container. This allows PNJ files to include an alpha channel, like PNG files, while still being compressed using lossy compression (reducing their file size in comparison to PNG files).

The PNG Development Group created the PNJ format for use alongside the .MNG (Multiple-Image Network Graphic) format. Each MNG file can be comprised of multiple PNJ files, used to show an animation. However, both MNG files and PNJ files are quite uncommon. Thus, most image viewers and editors cannot open PNJ files.

NOTE: During development of the MNG format, the PNG Development Group renamed the PNJ format to the JPEG Network Graphic ( .JNG ) format.

How to open a PNJ file

You may be able to open a PNJ file with XnViewMP . While XnViewMP does not officially support the PNJ format, it can open many types of image files, including .JNG files (to which PNJ files are related).

At this time, there is no known program that officially supports the PNJ format.

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Programs that open PNJ files

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Category: Raster Image Files

Updated: August 3, 2023

FAQ

What is a PNJ file?↓
A PNJ file is an image saved in the Portable Network JPEG (PNJ) format. PNJ files are similar to normal .JPG files, in that they contain image data compressed using lossy compression. However, unlike typical JPGs, PNJ files can contain transparent sections.
How do I open a .pnj file?↓
You may be able to open a PNJ file with XnViewMP. While XnViewMP does not officially support the PNJ format, it can open many types of image files, including .JNG files (to which PNJ files are related).

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