Download and install the latest version of Filestar.
Right click on one or more Jp2 file(s) on your desktop and select Convert with Filestar.
Type convert to jxl in the search box.
Press Convert.
Or let an AI agent do it: filestarcli -i photo.jp2 -c "convert to jxl" (how).
Documents - File Explorer─☐✕
This PC › Documents
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.jp2Contract.jp2
.xlsxBudget.xlsx
.pdfReport.pdf
.pngLogo.png
Filestar*Help✕
Drop files here to get started
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Let your AI agent convert JP2 to JXL
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 JP2 files in my Downloads folder to JXL”
Or run it yourself:
filestarcli -i photo.jp2 -c "convert to jxl"
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 JP2 to JXL?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i photo.jp2 -c "convert to jxl" on your computer, so your files stay on it.
A JP2 file is a compressed bitmap image created using JPEG 2000 Core Coding. It incorporates a wavelet compression algorithm instead of Digital Cosine Transform (DCT) compression, which is used by standard JPEG images. JP2 files can be stored using lossy and lossless compression.
A JPEG XL file is an image saved in a compressed graphic format currently under development by the Joint Photographic Experts Group (JPEG). It supports wide color gamut and HDR (High Dynamic Range), alpha channels and animation frames while providing visually lossless compression. Images can be converted back and forth between JPEG XL and JPEG without loss of quality. Converting a regular JPEG to JPEG XL reduces the file size by 22%. JPEG XL files can be used to store any type of image content.
