This document summarizes Veda Online (VO), a web-based interface for accessing and running Veda energy system optimization models via a web browser without needing local software. Key benefits of VO include no required software setup, enforced version control, model runs on cloud servers, improved data visualization, and enabling team collaboration. VO supports uploading Veda models from GitHub, browsing input data, defining and running model cases, and viewing results and reports. VO can be used for open pedagogical models, controlled deployment of private models, collaborative development, and running large scenario analyses in parallel on cloud servers.