ShapeScan: Photo to SVG outline in original size for precise 3D prints

ShapeScan is a browser tool that converts photos of objects into dimensionally accurate vector files. An image is turned into a clean outline that can be exported as SVG, DXF, PNG, or STL; according to the provider, STEP is planned. The focus is on true scaling in millimeters or inches and a typical accuracy of ±1 mm, with ±0.5 mm claimed in good lighting conditions. This makes the process suitable not only for quick tracing, but also for more reliable measurement of object contours than rough sketches.

The workflow is designed for speed: take a photo, upload it, trace it automatically, download the file. ShapeScan uses markers in the four corners of a sheet for calibration. These ArUco markers are designed to correct scale, perspective, and lens distortion at the same time – even with smartphone wide-angle lenses. There are templates for A4 and US Letter; the sheet should lie flat, for example on a clipboard or under glass. Soft, diffuse light improves recognition. According to the description, ShapeScan also works without markers, but is less robust.

The service accepts common image formats such as JPG, PNG, TIFF, BMP, and WEBP for uploading. Processing runs entirely in the browser; the provider does not specify any upload limits. Several steps come together in the background: AI-supported segmentation (U²-Net) separates the object from the background, then contour points are applied to edge lines using “edge snap.” Built-in editing allows for fine corrections to individual areas.

For 3D printing, the quick transfer to CAD is particularly interesting. An SVG or DXF outline can be imported as a sketch and then extruded, for example to design custom-fit holders, foam inlays, or Gridfinity organizers. ShapeScan cites laser cutting and CNC as further areas of application, for example for templates, tool holders, or vacuum fixings. The tool is free to use and is being further developed according to the project page; Sérgio Cruz and Inês Machado are named as developers.