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Convert 3D File Tool

Convert common CAD and mesh files to STL, then open the result in iamRapid's STL analysis, wall thickness, and error detection tools.

STL conversion workflow

Upload a 3D file

Supported inputs in this release: STEP, STP, IGS, IGES, OBJ, and STL.

Output format Binary STL

Ultra Smooth creates denser triangles for round CAD surfaces and usually takes longer to process.

Use this tool first for CAD or mesh files, then open the converted STL in iamRapid's STL-only tools.

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Upload a file to generate an STL that can be downloaded or opened in the STL tools.

Preview

Ready after conversion
Full viewer not loaded yet Convert a supported file to inspect the STL in the same 3D viewer used by STL Analysis and Error Detection.
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Free Online 3D File Converter

Convert between popular 3D file formats directly in your browser. Whether you need to convert STL to OBJ, STEP to STL, or transform files between other CAD and mesh formats, this tool handles the conversion instantly without requiring any software installation.

Supported 3D File Formats

When Do You Need to Convert 3D Files?

File conversion is essential when your CAD software exports in a format your 3D printer's slicer does not support, when collaborating with teams using different software, or when preparing scan data for manufacturing. Converting to STL is the most common step before 3D printing.

More Free Tools

After converting your file, use our STL analysis tool to check dimensions and volume, or repair the mesh if errors are detected. Ready to print? Get an instant quote from iamRapid.