The best Power BI canvas size depends on your audience and purpose. For most reports, 1920x1080 (16:9) is ideal — it’s modern, high-resolution, and scales well across devices. Use smaller canvases for tooltips, larger sizes like A3 for print, or 2560x1440 for big displays. In this guide, you’ll learn when to use the default size, when to customize, and how to make sure your report looks great everywhere.