Download and install the latest version of Filestar.
Right click on one or more J2k file(s) on your desktop and select Convert with Filestar.
Type convert to jbg in the search box.
Press Convert.
Or let an AI agent do it: filestarcli -i photo.j2k -c "convert to jbg" (how).
Documents - File Explorer─☐✕
This PC › Documents
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Desktop
Downloads
Documents
Pictures
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.j2kContract.j2k
.xlsxBudget.xlsx
.pdfReport.pdf
.pngLogo.png
Filestar*Help✕
Drop files here to get started
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Let your AI agent convert J2K to JBG
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 J2K files in my Downloads folder to JBG”
Or run it yourself:
filestarcli -i photo.j2k -c "convert to jbg"
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 J2K to JBG?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i photo.j2k -c "convert to jbg" on your computer, so your files stay on it.
Compressed bitmap image that uses wavelet compression instead of the DCT compression used by standard .JPEG images; supports 16-bit color, alpha transparency, and lossless compression.
Created by JBIG (Joint Bi-level Image Experts Group), JBG is a lossless file format that contains both colored and monochrome images. Commonly used to compress fax images, and it has better compression than G3 and G4 compression codecs.
