Open JWW files in your browser
Received a .jww file and nothing on your computer will open it? JWW is the native format of Jw_cad, a free CAD application used throughout Japan's architecture industry — and it's practically unreadable outside Japan. zumen-gate opens JWW files right in your browser: no Japanese software, no signup.
Can't open a JWW file? Common causes and fixes
Your CAD software doesn't recognize the .jww extension (JWW is proprietary to the Japanese application Jw_cad)
Drop the file on this page to view it in your browser — no Jw_cad needed.
You need the drawing in AutoCAD or another CAD application
Convert it to DXF here. Choose R2010 (AC1024) for AutoCAD, or R12 (AC1009) for older software.
The file is corrupted, or it's a different format renamed to .jww
When you drop a file, the format is auto-detected and a diagnostic (loss report) flags corruption and unsupported elements.
Convert it while you're here
A displayed JWW file can be converted straight to DXF, PDF, SVG, or PNG — and the loss report shows exactly what survived the conversion.
FAQ
JWW viewer — frequently asked questions
What is a .jww file?
A drawing file saved by Jw_cad, a free 2D CAD application that dominates the Japanese architecture industry. It is a proprietary binary format, which is why most CAD software outside Japan cannot open it.
Can I open a JWW file on a Mac?
Yes. Jw_cad itself runs only on Windows, but zumen-gate works in any modern browser, so you can open JWW files on macOS, Linux, and even tablets.
How do I convert JWW to DXF or PDF?
Drop the file on this page, pick DXF or PDF as the output, and convert. Downloads are free and unlimited, and a loss report shows exactly how the conversion went.