Download and install the latest version of Filestar.
Right click on one or more Jnx file(s) on your desktop and select Convert with Filestar.
Type convert to j2c in the search box.
Press Convert.
Or let an AI agent do it: filestarcli -i photo.jnx -c "convert to j2c" (how).
Documents - File Explorer─☐✕
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.jnxContract.jnx
.xlsxBudget.xlsx
.pdfReport.pdf
.pngLogo.png
Filestar*Help✕
Drop files here to get started
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Let your AI agent convert JNX to J2C
Claude Code, Codex, Cursor and other agents can do this on your computer with Filestar. Your files stay on your machine.
Install Filestar and add it to your agents:
npm install -g filestar
filestarcli agent install
Then ask your agent:
“Convert the JNX files in my Downloads folder to J2C”
Or run it yourself:
filestarcli -i photo.jnx -c "convert to j2c"
Runs on your computer, so your files stay on it. Works on Windows, macOS and Linux. 50 free conversions with the npm install, no account needed.
Can my AI agent convert JNX to J2C?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i photo.jnx -c "convert to j2c" on your computer, so your files stay on it.
JNX is a raster image file format used by Garmin devices. It stores satellite map images seen through a BirdsEye subscription. This satellite maps are divided into smaller tiles for faster loading when displaying them. Hence, the name tile format.
The JPEG 2000 Code Stream (j2c) file format is a type of image file format that is part of the JPEG 2000 family of image standards. This format is specifically designed for encoding images in a highly efficient manner, allowing for both lossless (exact reproduction) and lossy (approximate) compression. The j2c format focuses on the core coding stream of JPEG 2000 images, representing the encoded image data without additional metadata or structure.
