Since ETABS cannot run natively in a browser, the best way to use it "online" is via a Virtual Desktop Infrastructure (VDI). This streams a Windows desktop to your browser.
Navigate to the official CSI Cloud Viewer. Note: I cannot link directly due to policy changes, but search "CSI Cloud Viewer" on Google. It is the first result.
: Some online platforms allow you to upload structural files to convert them into web-friendly formats (like GLTF or OBJ) for visualization, though these often lose the structural analytical data (loads, sections, etc.). Remote Desktop/VDI
For now, opening an ETABS file online means viewing , not modeling .
: Tools like Vizicon allow you to export your model as an .E2K or .S2K text file, which can then be viewed in lightweight, often web-compatible or free-to-download viewer environments.
CSI launched this web-based platform a few years ago to solve the portability problem. It is not a full ETABS license, but it is a professional-grade viewer .