What survives conversion, and what does not
The geometry, text and attributes that come through a conversion unchanged, and the places where the result is an approximation or the data is left out entirely — with the reason in each case.
Everything below is current behaviour, not a roadmap.
Comes through
- Lines, arcs and circles. Ellipses keep their tilt and flattening ratio
- Text keeps its size, character spacing, rotation, bold and italic, and vertical 縦書き runs read top-to-bottom
- Japanese characters export in every format
- Filled polygons (ソリッド) keep the per-solid colour, which Jw_cad stores separately from the pen colour
- Layer groups and layers survive, and hidden ones stay hidden
- Pen colours, widths, and dashed, chain and dash-dot-dot line types, all read from your file's own pen table
- Blocks come through as blocks, not as a pile of exploded lines
- Points, including endpoint and SXF marker shapes
- Embedded raster images work if the file is Ver 7 or later
Doesn't, or not fully
- Text in a PDF export is drawn as a high-resolution image, which means you cannot select or search it. Embedding CJK fonts would add several megabytes to every page load, so the PDF gets pixels.
- Embedded raster images are skipped in DXF. All vector content still exports.
- Construction lines (補助線) are left out, the same as when Jw_cad prints.
- A block scaled differently in X than in Y gets its arcs approximated from the X scale. Uneven block scaling is rare in practice.
- Only .jww is read. For an older .jwc file, open it in Jw_cad and save it as .jww first.
- Conversion runs one way. There is no export back to .jww.
- Before sending an export on, check the key dimensions against the original in Jw_cad.