---
title: "IGES Viewer"
description: "Free online IGES and IGS viewer. Open legacy CAD models in your browser to inspect B-Rep surfaces and wireframe curves with zero uploads and full privacy."
toolId: "iges-viewer"
category: "preview"
subgroup: "model-viewer"
subgroupName: "3D Model Viewer"
url: "https://any3d.cc/en-US/tools/iges-viewer"
markdown: "https://any3d.cc/llm/tools/iges-viewer.md"
---

# IGES Viewer

Open IGES and IGS CAD models directly in your browser without installing CAD software, and inspect complex surfaces and curves with ease.

**Category:** 3D Model Viewer Tools (`preview`)
**Subgroup:** 3D Model Viewer (`model-viewer`)

**HTML:** https://any3d.cc/en-US/tools/iges-viewer

> Runs entirely in the browser. Files are not uploaded to Any3D servers.

## Overview

IGES (Initial Graphics Exchange Specification) is a foundational neutral CAD exchange format used throughout aerospace and automotive manufacturing. Many legacy engineering archives store 3D models in .iges or .igs files. This tool parses CAD geometry directly in your browser using local WebAssembly, allowing you to inspect trimmed B-Rep surfaces and standalone wireframe curves with smooth orbit, zoom, and pan controls.

## About Configuration Options

### Preview settings

- **Auto-rotate** (Default: Off): Slowly rotate the model around the vertical axis after loading for a full view. Can be toggled anytime in the left panel.
  - `on` — On: Auto-rotate after loading
  - `off` — Off (Recommended): Stay still, rotate manually only (default)

### Animation

- **Clips**: Number of animation clips stored in the file.
- **Bones**: Number of skeleton bones used for rigging and skinning.

## Format Information

### Input format

- **Extension:** iges, igs, igz, igesz
- **Full Name:** IGES (Initial Graphics Exchange Specification)
- **Type:** CAD Model
- **Format:** IGES
- **Tools:** [SolidWorks](https://www.solidworks.com), [Fusion 360](https://www.autodesk.com/products/fusion/overview), [FreeCAD](https://www.freecad.org)
- **Open With:** [3D Model Viewer](https://any3d.cc/en-US/tools/3dmodel-viewer), [IGES Viewer](https://any3d.cc/en-US/tools/iges-viewer)
- **Description:** IGES (Initial Graphics Exchange Specification) is one of the earliest neutral CAD exchange formats, storing geometry as B-Rep entities such as NURBS surfaces, trimmed patches, and analytic curves. For decades it served as a standard bridge between CAD systems in the automotive and aerospace industries, and a vast amount of historical engineering data still circulates today in .iges or .igs files.

IGES is a surface-oriented exchange format: the solid topology of modern CAD is often flattened into independent trimmed surfaces, and it carries no materials, textures, or parametric assembly history. Starting in 1994, its role has been gradually taken over by STEP. When opening legacy files, note that independent surface entities may leave open gaps, and the format does not support textures. It is suitable for geometric review rather than appearance presentation.
- **Supported Features:**
  - Neutral CAD exchange format
  - B-Rep surface and curve geometry
  - Widely supported by CAD/CAM/CAE software
  - Common in automotive and aerospace legacy data
- **Notes:**
  - The IGES format is widely supported in CAD software
  - Not suitable for real-time or web rendering

## FAQ

### How to view IGS or IGES files without CAD software?

Drag and drop your .igs or .iges file directly into this web viewer. The file is parsed locally in your browser, so you can inspect the 3D model immediately without installing AutoCAD, CATIA, SolidWorks, or any other CAD software.

### What is the difference between .igs and .iges files?

There is no difference in data or structure. The .igs extension is simply a three-letter abbreviation for the .iges format. Both extensions represent the Initial Graphics Exchange Specification format and work identically in this viewer.

### Can I view IGES and IGS files on mobile devices or tablets?

Yes. This viewer runs inside modern mobile browsers on iOS and Android. You can load .igs files from your device storage or cloud drive and use touch gestures to rotate, zoom, and inspect the 3D geometry on the go.

### Can I measure dimensions or export IGES files to STL or GLB?

This viewer is dedicated to high-speed visual inspection and geometry validation. To convert your IGES/IGS file to 3D printable STL, lightweight GLB, or STEP format, use the dedicated model conversion tools available on Any3D.

### Is this online IGS viewer free and safe for proprietary engineering data?

Yes. The tool is 100% free with no registration, no account creation, and no watermarks. All geometry parsing runs in client-side WebAssembly within your browser, so confidential CAD files never leave your local machine.

### Can I open compressed .igz or .igesz files?

Yes. Load the compressed file directly; there is no need to unzip it first.