Download and install the latest version of Filestar.
Right click on one or more Arj file(s) on your desktop and select Convert with Filestar.
Type convert to jar in the search box.
Press Convert.
Or let an AI agent do it: filestarcli -i file.arj -c "convert to jar" (how).
Documents - File Explorer─☐✕
This PC › Documents
Home
Desktop
Downloads
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Pictures
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.arjContract.arj
.xlsxBudget.xlsx
.pdfReport.pdf
.pngLogo.png
Filestar*Help✕
Drop files here to get started
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Let your AI agent convert ARJ to JAR
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 ARJ files in my Downloads folder to JAR”
Or run it yourself:
filestarcli -i file.arj -c "convert to jar"
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 ARJ to JAR?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.arj -c "convert to jar" on your computer, so your files stay on it.
The ARJ Compressed File Archive (.arj) is a file format used for data compression and archiving. Developed in the early 1990s by Robert Jung, ARJ stands for "Archived by Robert Jung". The format allows for efficient compression of files, supporting multi-volume archives, which means a large archive can be split into several smaller files for easier management and distribution. It also supports a high level of encryption for secure data storage.
A JAR file is a Java archive (JAR) file used by the Java Runtime Environment (JRE), a framework used for executing Java programs. JAR files may serve as program libraries or as standalone programs that run if the JRE is installed on the computer or mobile device.
