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JPG to DWG Converter

Scanned a paper drawing, or photographed one? Drop the .jpg here and get it back as a DWG you can actually draft on — free, no sign-up.

output

Drop images here, or click to choose

Conversion starts immediately. Up to 100 MB per file. You can also paste a screenshot

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How to convert JPG to DWG

Upload your JPG file

Drop your .jpg on the converter, click to browse, or paste a screenshot with Ctrl+V.

We trace the lines

The histogram is read with Otsu's method so JPEG ringing and paper tint fall below the cut, then only the surviving ink is vectorized.

Download a real DWG

You get a native 2018-format DWG with editable LWPOLYLINE geometry on its own A-SKETCH layer — editable geometry, ready to draft on, not a picture to trace again.

What you get: lines, not pictures

A floor plan with solid walls, furniture and text — and the CAD geometry this converter produces from it. Walls keep both faces, every thin line is a single editable polyline, and labels become real editable text.

Example JPG floor plan before conversion — Input: raster image (solid walls, thin furniture lines, text)

Editable DWG vector drawing produced by the converter — Output: editable DWG polylines (walls outlined, lines centerlined)

About JPG to DWG conversion

JPG is the default output of every flatbed scanner and every phone camera, which makes it the most common way a paper drawing starts its journey into CAD. It is also the most hostile input a tracer can get. JPEG is a lossy, block-based codec: it stores an 8×8 approximation of the image, and high-contrast edges — which is all a line drawing is — come back surrounded by ringing, mosquito noise and grey halos. Trace that naively and you get a fuzzy double line for every crisp pencil stroke.

The cleanup pass exists for exactly this. Before anything is measured the image is binarized with a threshold computed from its own histogram, so the halo tones and the yellowish cast of old paper land on the white side of the cut and simply cease to exist. Only then does tracing start. The practical limit is compression strength: at very low quality settings JPEG will have eaten thin construction lines before you ever uploaded the file, and nothing downstream can invent them back. Rescan at 300 DPI and quality 90 or above if a line vanishes.

Frequently asked questions

Will JPEG compression artifacts end up in my DWG?

No. The image is binarized using a threshold read from its own histogram, which puts ringing, mosquito noise and paper tint firmly on the white side before any geometry is measured. What gets traced is ink, not codec artifacts.

What scan settings give the best DWG?

300 DPI, greyscale or black-and-white, JPEG quality 90 or higher. Heavy compression destroys thin lines inside the file itself — no converter can recover a stroke the codec already averaged away, so quality at capture time matters more than anything you do afterwards.

Can I photograph a drawing instead of scanning it?

Yes, and it works well. Flat, even lighting is what matters: a shadow falling across the sheet reads as ink and gets traced as a blob. Shoot square to the page, avoid your own shadow, and keep the whole drawing in frame.

Are thick walls handled differently from thin lines?

Yes. The tracer classifies ink by thickness. A thin line becomes one polyline down its centerline, the way a drafter would redraw it. A solid region — a poché wall, a filled arrow — is traced along its real edges so both faces survive, instead of collapsing into a single stroke.

Which CAD programs open the result?

The output is 2018-format DWG, which BricsCAD, ZWCAD, GstarCAD, DraftSight, NanoCAD and every other CAD released since 2018 read natively. If the primary writer is unavailable the file falls back to R2000 DWG, opened by essentially everything since 2000.

Convert from a script or an AI agent

The same conversion is one HTTP call — no key, no account, no rate limit. The full machine-readable spec lives at /llms.txt.

curl -X POST https://nasji.com/api/convert \
  -F "[email protected]" \
  -F "target=dwg" \
  -o drawing.dwg