Convert SXF(P21) to DXF Structural
No signup, unlimited use. Drop a file to convert SXF (P21) to DXF and preview the result instantly. Deterministic conversion — entities are mapped one-to-one wherever possible.
- 01Drop your drawing file
- 02Pick a format & convert
- 03Preview & download
When you need this
- Open P21 deliverables from a Japanese client in your CAD
- Convert P21 drawings to DXF for reuse in new designs
- Inspect Japanese e-delivery data without special software
About converting SXF(P21) to DXF
P21 is the formal SXF deliverable format used in Japanese public-works projects, based on ISO 10303 (STEP). Very few tools outside Japan open it. zumen-gate reads .p21 files directly in your browser and converts them to DXF for use in AutoCAD or any other CAD.
P21 is the formal file type of SXF, the Japanese public-works CAD exchange standard based on ISO 10303 (STEP). If you received .p21 drawings from a Japanese client, very few tools outside Japan can open them.
The converted DXF opens in AutoCAD, BricsCAD, LibreCAD, QCAD, and practically any other CAD application. You can choose between R2010 (AC1024) for modern software and R12 (AC1009) for older tools.
All conversions run through a single engine with a common intermediate representation. Every conversion produces a loss report tallying which entities were converted as-is and which were approximated or dropped — so you can trust the output, or know exactly why not.
FAQ
SXF(P21) → DXF conversion — frequently asked questions
Which DXF version should I choose?
Choose R2010 (AC1024) for AutoCAD and most modern CAD software. Choose R12 (AC1009) for older CAD applications or CNC/CAM tools. If unsure, try R2010 first and fall back to R12 if it won't open.
Will my drawing break when converting SXF(P21) to DXF?
The conversion is a deterministic, structural translation through a common intermediate representation. After every conversion you get a loss report listing exactly which entities were converted, approximated, or dropped — so you can verify the result on the spot.
Is there a limit on conversions or downloads?
No. Conversions and downloads are unlimited, and no account is required. The only limit is 10MB per file.
What happens to the files I upload?
Transfers and storage are encrypted, and your drawings are never sold or shared with third parties. On the free tier, uploads are used to improve the service and train our AI models, so please avoid uploading confidential drawings. A no-training Pro plan is available — see the data policy page for details.