100% Private
Conversion runs entirely in your browser. Your drawings are never uploaded to a server — safe even for confidential work.
Offline capableLatest updates
- The quick-convert page now has the full interactive viewer — zoom, pan, and a color/monochrome toggle.
- Zoom no longer goes below 100%, so drawings stay legible while panning.
- Improved parsing accuracy for a wider range of JWW files, including layer visibility and line styles.
100% client-side processing
JWW drawings, converted in your browser
Privacy-first JWW viewer & converter
Your files never leave your browser.No upload required — all processing happens on your device.
Drag & drop a JWW file here
Supported format: .jww (Jw_cad)
Why use JWW Converter
Multi-Format Export
Turn one drawing into SVG, PDF, PNG, or DXF — vector or raster, whichever your workflow needs.
SVG · PDF · PNG · DXFAnnotate & Mark Up
Mark up drawings with lines, arrows, shapes, highlights, and text notes — then export with your markup included.
Markup · Redline · NotesNo Installation
No Jw_cad, plugins, or sign-up. Open the page, drop a file, and start working instantly.
Instant startMore on JWW files
Longer write-ups on the format and on what conversion does to a drawing.
What a JWW file actually is
Where the format came from, what it stores, why other software struggles with it, and the situations that send people looking for a converter.
Read →Choosing an export format: SVG, PDF, PNG or DXF
A comparison of the four export formats by editability, text handling and intended use, so you can pick without trial and error.
Read →What survives conversion, and what does not
Geometry, text, layers, line types and blocks all come through. PDF text is rasterised and DXF drops embedded images. The full list, with reasons.
Read →How to check that a browser converter is really local
Use the network tab, pull the network cable, and look for an upload endpoint. Also: what this site does store, which is not your drawing.
Read →Opening a JWW file on a phone
Jw_cad has no mobile version, so a phone has nothing to open a .jww with. Converting in the phone's browser, asking for a PDF, remote desktop, and viewer apps compared.
Read →How it works
Converting a JWW file takes three steps — all on your device.
- 1
1. Open your file
Drag a .jww file onto the page or pick it with the file chooser. Parsing happens in your browser using a Web Worker, so the page stays responsive.
- 2
2. Preview the drawing
The drawing renders instantly. Zoom and pan to inspect it, and toggle monochrome to preview a black-and-white version.
- 3
3. Export
Choose SVG, PDF, PNG, or DXF and download. The output matches what you see, including the monochrome setting.
Which format should I choose?
- SVG
- Scalable vector image — ideal for the web and further editing.
- PNG
- A raster image that opens anywhere. Choose the resolution.
- Print-ready PDF: vector geometry with text embedded as an image.
- DXF
- CAD drawing data (R13) that opens in other CAD software.
Frequently asked questions
What is a JWW file?
A JWW file is a drawing created by Jw_cad, a widely used Japanese CAD application. It stores lines, arcs, text, and other 2D drawing data.
Is JWW Converter free?
Yes. The converter is completely free and runs entirely in your browser.
Are my files uploaded anywhere?
No. All parsing and conversion happen locally in your browser. Your files never leave your device.
Which formats can I export to?
You can export to SVG, PDF, PNG, and DXF. SVG and PDF keep vector geometry; PNG is a raster image; DXF opens in other CAD software.
Can I annotate or mark up a JWW drawing?
Yes. The built-in annotation tools let you draw lines, arrows, rectangles, and circles, highlight areas, and add text notes on the drawing. Annotations can be moved, resized, and erased, and they are included when you export.
What languages does JWW Converter support?
The interface is available in Japanese and English. Japanese text inside JWW drawings is fully supported and rendered accurately in every export format.
Why isn't the text selectable in the PDF?
PDF geometry is exported as true vectors, but text is embedded as a high-resolution image. This keeps Japanese characters accurate without bundling large fonts.