Convert JPEG Network Graphics images (JNG) online for free
The converter easily converts your JNG images to various formats - free and online. No ImageMagick or or other Raster Image software needed.
The converter also works in reverse, so you can convert other "Lossy Image with Transparency" formats to JNG without using software like ImageMagick or a similar tool.
The .JNG (JPEG Network Graphics) file format is a raster image format developed by the PNG Development Group to encapsulate standard JPEG image data with an optional 8-bit or 16-bit alpha channel. It was designed as a companion to the MNG animation format, allowing web developers to use lossy compression for photographic images while maintaining transparent backgrounds. You can open these files using dedicated image utilities like IrfanView, XnView, or command-line tools like ImageMagick.
The primary disadvantage of the .JNG format is its near-total lack of support. Modern web browsers natively reject it, and mainstream operating systems cannot render previews for it in their file explorers. It is practically a dead format. Because it relies on the complex MNG specification, software developers abandoned it in favor of more modern, unified formats. Storing files as .JNG isolates your images and makes them unshareable to non-technical users.
To make these images usable, you must convert them. For web publishing that requires both lossy compression and transparency, convert .JNG to WEBP. If you only need broad compatibility and have no transparent elements, convert to standard JPG. For lossless archiving of transparency data, use PNG. Just drag and drop your file here to analyze and convert it - free, online, and without installing software.
Use Convert.Guru to open and convert your JNG file.
Users also converted JPG, HEIC, PNG, AVIF, SG_, SGDT and IG files.
If you want to convert JNG file to ICO or CUR, you can use ImageMagick or similar software from the "Raster Image Storage" category. In the File menu, look for Save As… or Export….
To convert RAW or AI files to JNG, try ImageMagick or another comparable tool in the "Raster Image Storage" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our JNG converter.