diff --git a/frontend/src/tools/drawing/CircleTool.ts b/frontend/src/tools/drawing/CircleTool.ts
new file mode 100644
index 0000000..e4fcb8f
--- /dev/null
+++ b/frontend/src/tools/drawing/CircleTool.ts
@@ -0,0 +1,43 @@
+import { Tool } from '../Tool';
+import { YjsDocument } from '../../crdt/YjsDocument';
+
+class CircleTool extends Tool {
+  private centerPoint: { x: number; y: number } | null = null;
+
+  constructor(yjsDoc: YjsDocument) {
+    super(yjsDoc);
+    this.name = 'CircleTool';
+  }
+
+  onMouseDown(event: MouseEvent): void {
+    if (!this.centerPoint) {
+      this.centerPoint = { x: event.clientX, y: event.clientY };
+    } else {
+      // Calculate radius and create circle element in Yjs document
+      const radius = Math.sqrt(
+        Math.pow(event.clientX - this.centerPoint.x, 2) +
+        Math.pow(event.clientY - this.centerPoint.y, 2)
+      );
+      this.yjsDoc.createCircle(this.centerPoint.x, this.centerPoint.y, radius);
+      this.centerPoint = null;
+    }
+  }
+
+  onMouseMove(event: MouseEvent): void {
+    // Preview circle while dragging
+  }
+
+  onMouseUp(event: MouseEvent): void {
+    // Handle mouse up if needed
+  }
+
+  onKeyUp(event: KeyboardEvent): void {
+    // Handle key up events
+  }
+
+  reset(): void {
+    this.centerPoint = null;
+  }
+}
+
+export { CircleTool };
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