Your files never leave your computer
Conversion runs inside this browser tab using OpenCascade compiled to WebAssembly. Nothing is uploaded, so it is safe for client and NDA work.
Free, no sign-up
Bulk IGES to STL converter
Drop in as many .igs or .iges files as you like. They convert in your browser, and nothing gets uploaded.
STEPIGEStoSTL
Runs on your device
Settings changed.
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Built for people who print
Pick the mesh quality
Draft, Standard or Fine. A tighter tolerance gives smoother curves and bigger files.
- Draft
- 0.2mm
- Standard
- 0.05mm
- Fine
- 0.01mm
Convert a whole folder
Drop dozens of files, or a whole folder, at once. They convert in parallel and download as one ZIP.
- .step
- .stp
- .iges
- .igs
Check it before you slice
Open any result in a 3D preview and orbit around it to make sure every part came through.
How to convert IGES to STL
IGES is an older neutral CAD format, saved as .igs or .iges. Many older CAD systems and machining workflows still use it. To 3D print an IGES part, it first needs converting to an STL mesh.
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Add your files
Drop your .igs or .iges files onto the converter, or click Choose files. STEP files work too, and you can drop a whole folder.
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Pick a mesh quality
Standard works for most prints. Choose Fine for small parts with tight curves, or Draft for quick checks.
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Download your STL files
Save each STL on its own or everything as one ZIP, then open it in Cura, PrusaSlicer, Bambu Studio or OrcaSlicer.
IGES to STL questions
What is an IGES file?
IGES (Initial Graphics Exchange Specification) is an older neutral CAD format saved as .igs or .iges. Many older CAD systems and machining workflows still export it.
Why does my IGES file convert with holes?
IGES files often contain separate surfaces instead of closed solids. They still convert, but the STL can have small gaps. If your slicer reports holes, use its repair tool, or export STEP from the original CAD program instead.
Should I use STEP or IGES?
If you can choose, export STEP. It keeps solids and assembly structure more reliably, and it converts with the STEP to STL converter on this site.
Are my files uploaded anywhere?
No. Your CAD files are read from your disk, converted in your browser's memory and saved straight back to your disk. Nothing is sent to a server.
What units does the STL use?
STL files have no units. This tool exports in millimetres, which is what slicers assume, so parts load at the right size.
What do Draft, Standard and Fine mean?
They set how closely the triangles follow curved surfaces: within 0.2 mm, 0.05 mm or 0.01 mm. Standard suits most FDM and resin prints. Use Fine for small parts with tight curves.
What does "One STL per body" do?
By default an assembly becomes a single STL. Turn this on to get a separate STL for each body, grouped in a folder named after the source file.
Is there a file size limit?
There is no fixed limit, but very large assemblies can run out of browser memory. If a file fails, try Draft quality or convert it on its own.
Is it really free?
Yes. No account, no watermark and no limit on the number of files.