diff --git a/src/js/history.js b/src/js/history.js
new file mode 100644
index 0000000..0251535
--- /dev/null
+++ b/src/js/history.js
@@ -0,0 +1,35 @@
+class History {
+	constructor() {
+		this.undoStack = new BoundedStack(32);
+		this.redoStack = new BoundedStack(32);
+	}
+
+	saveState(snapshot) {
+		this.undoStack.push(snapshot);
+		this.redoStack.clear();
+	}
+
+	undo(currentSnapshot) {
+		if (this.undoStack.isEmpty()) return null;
+
+		// save current state to redo stack before undoing
+		if (currentSnapshot) {
+			this.redoStack.push(currentSnapshot);
+		}
+
+		return this.undoStack.pop();
+	}
+
+	redo(currentSnapshot) {
+		if (this.redoStack.isEmpty()) return null;
+
+		// save current state to undo stack before redoing
+		if (currentSnapshot) {
+			this.undoStack.push(currentSnapshot);
+		}
+
+		return this.redoStack.pop();
+	}
+}
+
+const history = new History();