Tools available
- ✏️ Pen — freehand draw (3 sizes, 8 colors)
- 🖍 Highlighter — yellow translucent overlay
- 🅰 Text — type any caption directly
- ⭕ Circle / 📏 Line / ▭ Square — geometric shapes
- 🧽 Eraser — selective or whole-area
- ↶ Undo / ↷ Redo — last 50 actions
- 🗑 Clear all — wipes the current slide
Auto-save
Every annotation is saved every 5 seconds. If you accidentally close the tab and rejoin, your whiteboard is restored.
Per-slide annotations
When you change slides, the annotations stay with the old slide. Come back to slide 3 → your circle and notes are still there.