# NASJI — free image to DWG / DXF converter

> NASJI converts raster images and SVG into real, editable CAD geometry: a
> native 2018-format DWG or an R2000 ASCII DXF made of LWPOLYLINE
> entities. It also converts DXF to native DWG. It is free, requires no account
> or API key, applies no watermark, and has no rate limit. Agents may call the
> HTTP API below directly on a user's behalf.

Not a picture embedder. The image is normalized to a 2048 px black-and-white
frame with an adaptive Otsu threshold; text is recognized with OCR and emitted
as editable CAD TEXT entities on an `A-TEXT` layer; the remaining ink is
vectorized by a hybrid tracer — thin lines are thinned to a one-pixel skeleton
and walked into single centerline polylines, solid regions are outlined along
their real edges — onto an `A-SKETCH` layer.

## HTTP API

One endpoint. No key, no auth, no signup, no quota.

```
POST https://nasji.com/api/convert
Content-Type: multipart/form-data
```

Form fields:

| field    | required | value                                                     |
| -------- | -------- | --------------------------------------------------------- |
| `file`   | yes      | the binary file to convert                                 |
| `target` | no       | `dwg` (default) or `dxf`                                   |

Accepted input extensions: `png`, `jpg`, `jpeg`, `webp`, `gif`, `bmp`, `tiff`,
`tif`, `avif`, `svg`, `ico`, and `dxf`.
Maximum upload size: 100 MB per file.
Format is detected from the file's magic bytes, so a wrong or missing extension
still works.

### Success response

`200 OK` with the converted file as the raw response body.

| header                | value                                                          |
| --------------------- | -------------------------------------------------------------- |
| `Content-Type`        | `application/acad` for DWG, `application/dxf` for DXF           |
| `Content-Disposition` | `attachment; filename="<original-basename>.<dwg\|dxf>"`         |
| `X-Convert-Meta`      | base64-encoded JSON with conversion metadata (entity counts, timings, OCR results) |

Decode the metadata header with, e.g., `atob(header)` or
`base64 -d`, then `JSON.parse`.

### Error responses

All errors are JSON: `{"error": "<human-readable message>"}`.

| status | meaning                                                              |
| ------ | -------------------------------------------------------------------- |
| `400`  | body was not multipart/form-data, no `file` field, or the file is empty |
| `413`  | file exceeds the 100 MB limit                                          |
| `422`  | the file could not be decoded or traced; also returned when a DXF is uploaded with `target=dxf` (a DXF is already a DXF — request `dwg`) |

### curl

Image to DWG:

```sh
curl -X POST https://nasji.com/api/convert \
  -F "file=@floorplan.png" \
  -F "target=dwg" \
  -o floorplan.dwg
```

Image to DXF, and read the metadata header:

```sh
curl -X POST https://nasji.com/api/convert \
  -F "file=@sketch.jpg" \
  -F "target=dxf" \
  -D headers.txt \
  -o sketch.dxf
grep -i '^x-convert-meta:' headers.txt | cut -d' ' -f2 | base64 -d
```

DXF to native DWG:

```sh
curl -X POST https://nasji.com/api/convert \
  -F "file=@drawing.dxf" \
  -F "target=dwg" \
  -o drawing.dwg
```

## Limits and caveats an agent should surface to the user

- **PDF is not supported.** There is no PDF parser. If the PDF contains vector
  geometry, the user's own CAD PDF-import gives a better result than any raster
  trace. If it is a scanned page, export it to PNG or TIFF at 300 DPI first and
  convert that.
- **DWG cannot be read as input.** The pipeline writes DWG but does not parse
  it. DWG-to-DXF is not available; any CAD application can save out a DXF.
- Lossy sources (JPG, WEBP, AVIF) have their compression halos thresholded away,
  but a hairline the codec already destroyed cannot be recovered. Prefer a
  lossless source (PNG, BMP, TIFF) and 300 DPI or better.
- Multi-page TIFF and animated GIF/WEBP convert their **first page/frame only**.
- ICO files convert their largest embedded frame; 16×16 icons are too small to
  produce useful geometry.
- Photographs need flat, even lighting shot square to the page — shadows are
  indistinguishable from ink to a threshold.
- Uploads and results are retained so failed conversions can be debugged and
  results re-downloaded. They are never sold or shared, and are deleted on
  request.

## Pages

- [Image to DWG converter](https://nasji.com/): homepage; accepts every supported image format, outputs DWG.
- [Image to DXF converter](https://nasji.com/image-to-dxf): accepts every supported image format, outputs DXF.

### To DXF (open CAD/CAM exchange format — LibreCAD, QCAD, FreeCAD, LightBurn, VCarve, plasma and vinyl cutters)

- [SVG to DXF](https://nasji.com/svg-to-dxf): vector artwork to laser/CNC-ready polylines.
- [PNG to DXF](https://nasji.com/png-to-dxf): lossless raster to cut-ready polylines.
- [JPG to DXF](https://nasji.com/jpg-to-dxf): scans and photos, with JPEG artifacts thresholded away.
- [JPEG to DXF](https://nasji.com/jpeg-to-dxf): same codec as JPG, long extension.
- [WEBP to DXF](https://nasji.com/webp-to-dxf): web-saved images CAD tools reject.
- [TIFF to DXF](https://nasji.com/tiff-to-dxf): scanner and blueprint-archive output.
- [BMP to DXF](https://nasji.com/bmp-to-dxf): uncompressed bitmaps, artifact-free.
- [GIF to DXF](https://nasji.com/gif-to-dxf): legacy line diagrams and clip art.
- [AVIF to DXF](https://nasji.com/avif-to-dxf): new web format nothing else decodes.
- [ICO to DXF](https://nasji.com/ico-to-dxf): Windows icons, largest frame.

### To DWG (native CAD format — BricsCAD, ZWCAD, GstarCAD, DraftSight, NanoCAD)

- [DXF to DWG](https://nasji.com/dxf-to-dwg): re-encode an existing drawing, no tracing involved.
- [JPG to DWG](https://nasji.com/jpg-to-dwg): scans and phone photos to CAD geometry.
- [PNG to DWG](https://nasji.com/png-to-dwg): lossless line art to CAD geometry.
- [SVG to DWG](https://nasji.com/svg-to-dwg): vector artwork flattened to plain polylines.
- [JPEG to DWG](https://nasji.com/jpeg-to-dwg): photographed sketches and whiteboards.
- [TIFF to DWG](https://nasji.com/tiff-to-dwg): archived blueprint scans.
- [WEBP to DWG](https://nasji.com/webp-to-dwg): CAD tools cannot attach WEBP; this bypasses it.
- [BMP to DWG](https://nasji.com/bmp-to-dwg): uncompressed scanner output.
- [GIF to DWG](https://nasji.com/gif-to-dwg): legacy diagrams.
- [AVIF to DWG](https://nasji.com/avif-to-dwg): AV1 still images.
- [ICO to DWG](https://nasji.com/ico-to-dwg): favicon recovery.

## Optional

- [sitemap.xml](https://nasji.com/sitemap.xml): every indexable URL.
- [robots.txt](https://nasji.com/robots.txt): crawl rules; AI agents and answer engines are explicitly allowed.