Free IGES (.iges, .igs) to STL (.stl) converter — running entirely in your browser. No upload, no signup, no file limits: your files never leave your device.
STEP · IGES · BREP · STL · OBJ · PLY · GLB · glTF · 3MF · COLLADA · AMF · FBX · 3DS · OFF
IGES is one of the oldest neutral CAD exchange formats, dating back to 1980. It represents models as surfaces and curves rather than watertight solids, and although STEP has largely replaced it, IGES files remain everywhere in legacy archives, tooling data and supplier exchanges.
STL is the de-facto standard for 3D printing. It describes a model purely as a mesh of triangles — no color, no units, no assembly structure — which makes it simple, universally supported, and the required input for virtually every slicer, from PrusaSlicer and Cura to resin-printer tools.
| IGES | STL | |
|---|---|---|
| Geometry | B-rep surfaces & curves | Triangle mesh |
| Units | Yes, embedded | No — unitless numbers |
| Colors & materials | Limited | No |
| Animations | No | No |
| Typical use | Legacy CAD exchange | 3D printing |
Yes — free with no accounts, no watermarks and no file-size limits. Conversion runs on your own machine, so there are no server costs behind it.
No. The converter runs entirely in your browser using WebAssembly. Your .iges file never leaves your device, which makes it safe for confidential designs.
IGES stores exact CAD surfaces, which are tessellated into triangles at a quality you choose — from fast drafts to near-exact precision meshes. Preview the result in the built-in 3D viewer before downloading.
Yes. Every converted model opens in the built-in 3D viewer with an assembly tree, display modes and section views, so you can inspect the result first.
IGES stores exact boundary surfaces, but every output available here is a triangle mesh. Tessellation is irreversible: feature history, constraints and analytic curves cannot be recovered from the converted file. The STL result also has no units, colors, material data or part names, so keep the source alongside it.
IGES and STEP both move CAD data between systems, but they are generations apart. When IGES still appears, why STEP usually wins, and how to convert both for free.
What do tessellation quality settings actually control? Linear and angular deflection explained with practical presets for 3D printing, rendering and web delivery.
Which file format should you actually print from? A practical ranking of STL, OBJ, 3MF and AMF for FDM and resin printing, with free conversion tools.