Download and install the latest version of Filestar.
Right click on one or more G4 file(s) on your desktop and select Convert with Filestar.
Type convert to jbig in the search box.
Press Convert.
Or let an AI agent do it: filestarcli -i file.g4 -c "convert to jbig" (how).
Documents - File Explorer─☐✕
This PC › Documents
Home
Desktop
Downloads
Documents
Pictures
Music
.g4Contract.g4
.xlsxBudget.xlsx
.pdfReport.pdf
.pngLogo.png
Filestar*Help✕
Drop files here to get started
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Let your AI agent convert G4 to JBIG
Claude Code, Codex, Cursor and other agents can do this with Filestar. This skill runs in Filestar's cloud and needs a paid Filestar plan.
Install Filestar and add it to your agents:
npm install -g filestar
filestarcli agent install
Then ask your agent:
“Convert the G4 files in my Downloads folder to JBIG”
Or run it yourself:
filestarcli -i file.g4 -c "convert to jbig"
Runs in Filestar's cloud and needs a Filestar plan.
Can my AI agent convert G4 to JBIG?
Yes, with a paid Filestar plan: this skill runs in Filestar's cloud. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.g4 -c "convert to jbig".
Group 4 (G4) used for black and white lossless compression to maintain high-quality images, commonly used in TIFF format compression by fax machines. A picture is seen as black dots and lines on a blank page; the fewer the dots and lines are, the lesser the file size.
JBIG is a lossless compression file format that was created for the fax machine; it can be used by other image file formats. The files created by JBIG format are smaller compared to G3 and G4 file formats.
