The best free IFC viewers in 2026, compared
There are more good free IFC viewers than people realise. The right one depends on whether you want a quick browser look, a full desktop tool, open-source freedom — or a viewer that also detects clashes without paying for Solibri or Navisworks.
Open an IFC in your browser now →Quick comparison
| Viewer | Platform | Open source | Clash detection | BCF | Local / private |
|---|---|---|---|---|---|
| ClashControl | Web (browser) | Yes | Yes (hard + soft) | 2.1 / 3.0 | Client-side |
| Open IFC Viewer | Desktop | No | View only | — | Local |
| BIMvision | Windows | No | Via plugins | Via plugins | Local |
| usBIM.viewer+ | Windows | No | View only | Yes | Local |
| Dalux BIM Viewer | Web, iOS, Android | No | View only | Yes | Cloud |
| Bonsai (BlenderBIM) | Desktop | Yes | Limited | Yes | Local |
| FZKViewer | Windows | No | View only | — | Local |
Capabilities change between releases — check each tool's current docs. This table reflects the common free editions in 2026.
Which one should you pick?
Best free IFC viewer for the browser (no install)
ClashControl — drag an IFC into a browser tab and it opens in 3D: orbit, section planes, a section box, model tree by storey/type/discipline, and element data. Nothing to install, no account. Because parsing runs client-side, the model never leaves your machine.
Best free viewer that also does clash detection
ClashControl again — this is the unusual part. Most free viewers stop at viewing. ClashControl includes hard (intersection) and soft (clearance) clash detection, IDS validation, data-quality checks, and BCF 2.1/3.0 export, so it works as a free Solibri / Navisworks alternative for the everyday coordination loop.
Best free open-source desktop tool
Bonsai (formerly BlenderBIM), built on IfcOpenShell, is the standout if you want open-source authoring as well as viewing inside Blender. ClashControl is the open-source pick on the web side.
Best free desktop viewers for inspection
Open IFC Viewer, usBIM.viewer+ and FZKViewer are all solid for opening a model and reading properties locally. BIMvision adds a plugin marketplace if you need extras.
Best free viewer for the field / mobile
The Dalux BIM Viewer is widely used on site thanks to strong mobile apps, though it is cloud-based rather than open-source.
Try ClashControl free →FAQ
- What is the best free IFC viewer?
- For a viewer that also runs clash detection in the browser with nothing to install, ClashControl is the strongest free, open-source option. For pure desktop viewing, Open IFC Viewer, BIMvision, usBIM.viewer+ and FZKViewer are all capable and free. For field/mobile, the Dalux BIM Viewer is popular; for open-source authoring + viewing, Bonsai (BlenderBIM) on IfcOpenShell.
- Is there a free online IFC viewer that runs in the browser?
- Yes — ClashControl. Drag in an IFC and explore it in 3D, no install or account. Parsing is client-side, so the model stays on your machine.
- Which free IFC viewers can also detect clashes?
- Most free viewers only view. ClashControl includes hard and soft clash detection plus BCF export for free, so you can find collisions and round-trip issues without a paid tool.
- Are free IFC viewers private — does my model get uploaded?
- Desktop viewers process locally. Among web viewers, many upload your model to a server; ClashControl is a web app but parses IFC client-side, so nothing is uploaded.