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BMP to DWG Converter

Upload an uncompressed .bmp scan and download a DWG of clean editable polylines. Files up to 100 MB, free, no account needed.

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 BMP to DWG

Upload your BMP file

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

We trace the lines

A BMP is raw pixels, so there is no codec damage to undo — the threshold operates on exactly the tones the scanner recorded.

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 BMP 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 BMP to DWG conversion

BMP stores raw pixels with no compression at all, which is why it refuses to die in industrial settings: old scanner drivers, Windows imaging utilities, machine-vision cameras and plenty of shop-floor software still write it. The files are enormous compared to a PNG of the same picture, and that is the entire point — nothing has been approximated. Every tone the scanner recorded is the tone the tracer sees, so there is no ringing to threshold away and no block structure to mistake for geometry. For pure line work a BMP scan is the best-case input this converter can be handed.

Size is the only practical concern. The upload limit is 100 MB, which comfortably holds a full-sheet 24-bit scan, and because the image is normalized to a 2048-pixel working frame before anything else happens, a physically enormous bitmap converts in about the same time as a small one. If a scan does exceed the limit, saving it as PNG is lossless — you lose nothing at all, just the bulk.

Frequently asked questions

My BMP scan is huge — will it upload?

Up to 100 MB, yes, which covers most full-sheet 24-bit scans. Above that, re-save as PNG: PNG is also lossless, so the pixels are identical and only the file size changes. Nothing about the trace quality is affected.

Is a BMP really better input than a JPG?

For line drawings, yes. BMP is uncompressed, so there is no ringing around edges and no block artifacts — the threshold sees exactly what the scanner recorded. A JPG of the same scan needs artifacts cleaned away first, and very heavy compression can destroy thin lines outright.

Are 1-bit and 8-bit BMP files supported?

Yes. Monochrome, greyscale, palette and 24-bit BMP files are all decoded and normalized before tracing. 1-bit scans are ideal — the image is already binary, so thresholding is effectively a no-op.

Does conversion take longer because the file is bigger?

Barely. The first step scales the image to a 2048-pixel working frame, so tracing time depends on how much linework is in the drawing, not on the original pixel count. Upload time is what you actually wait for on a large BMP.

What layers does the DWG use?

Traced geometry goes on A-SKETCH as LWPOLYLINE entities; OCR-recognized labels go on A-TEXT as editable TEXT. Keeping them apart lets you freeze the linework and re-letter, or freeze the text and redraft, without unpicking a single-layer file.

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