diff --git a/excalidraw-app/app_constants.ts b/excalidraw-app/app_constants.ts
index 1dc6c6f462..c3a0fa9a82 100644
--- a/excalidraw-app/app_constants.ts
+++ b/excalidraw-app/app_constants.ts
@@ -23,6 +23,7 @@ export enum WS_SUBTYPES {
   INVALID_RESPONSE = "INVALID_RESPONSE",
   INIT = "SCENE_INIT",
   UPDATE = "SCENE_UPDATE",
+  DELETE = "SCENE_DELETE",
   MOUSE_LOCATION = "MOUSE_LOCATION",
   IDLE_STATUS = "IDLE_STATUS",
   USER_VISIBLE_SCENE_BOUNDS = "USER_VISIBLE_SCENE_BOUNDS",
diff --git a/excalidraw-app/collab/Collab.tsx b/excalidraw-app/collab/Collab.tsx
index 595295611f..f4fd6a6b68 100644
--- a/excalidraw-app/collab/Collab.tsx
+++ b/excalidraw-app/collab/Collab.tsx
@@ -72,6 +72,7 @@ import {
 } from "../data/FileManager";
 import { LocalData } from "../data/LocalData";
 import {
+  deleteRoomFromFirebase,
   isSavedToFirebase,
   loadFilesFromFirebase,
   loadFromFirebase,
@@ -115,6 +116,7 @@ export interface CollabAPI {
   onPointerUpdate: CollabInstance["onPointerUpdate"];
   startCollaboration: CollabInstance["startCollaboration"];
   stopCollaboration: CollabInstance["stopCollaboration"];
+  deleteRoom: CollabInstance["deleteRoom"];
   syncElements: CollabInstance["syncElements"];
   fetchImageFilesFromFirebase: CollabInstance["fetchImageFilesFromFirebase"];
   setUsername: CollabInstance["setUsername"];
@@ -228,6 +230,7 @@ class Collab extends PureComponent<CollabProps, CollabState> {
       isCollaborating: this.isCollaborating,
       onPointerUpdate: this.onPointerUpdate,
       startCollaboration: this.startCollaboration,
+      deleteRoom: this.deleteRoom,
       syncElements: this.syncElements,
       fetchImageFilesFromFirebase: this.fetchImageFilesFromFirebase,
       stopCollaboration: this.stopCollaboration,
@@ -675,6 +678,18 @@ class Collab extends PureComponent<CollabProps, CollabState> {
             break;
           }
 
+          case WS_SUBTYPES.DELETE: {
+            const { roomId } = decryptedData.payload;
+            if (this.portal.roomId === roomId) {
+              this.destroySocketClient({ isUnload: true });
+              this.setIsCollaborating(false);
+              this.setActiveRoomLink(null);
+              this.setErrorDialog(t("alerts.collabRoomDeleted"));
+              window.history.pushState({}, APP_NAME, window.location.origin);
+            }
+            break;
+          }
+
           default: {
             assertNever(decryptedData, null);
           }
@@ -894,6 +909,42 @@ class Collab extends PureComponent<CollabProps, CollabState> {
     });
   };
 
+  deleteRoom = async (): Promise<void> => {
+    if (!this.portal.socket || !this.portal.roomId) {
+      return;
+    }
+
+    const { roomId, roomKey } = this.portal;
+    if (!roomId || !roomKey) {
+      return;
+    }
+
+    const link = this.getActiveRoomLink();
+    if (!link) {
+      return;
+    }
+
+    // check if the room belongs to the current user
+    const isOwner = await roomManager.isRoomOwnedByUser(link);
+
+    if (!isOwner) {
+      return;
+    }
+
+    try {
+      this.portal.broadcastRoomDeletion();
+      await deleteRoomFromFirebase(roomId, roomKey);
+      await roomManager.deleteRoom(roomId);
+      this.stopCollaboration(false);
+      this.setActiveRoomLink(null);
+      window.history.pushState({}, APP_NAME, window.location.origin);
+    } catch (error) {
+      console.error("Failed to delete room:", error);
+      this.setErrorDialog(t("errors.roomDeletionFailed"));
+      throw error;
+    }
+  };
+
   public setLastBroadcastedOrReceivedSceneVersion = (version: number) => {
     this.lastBroadcastedOrReceivedSceneVersion = version;
   };
diff --git a/excalidraw-app/collab/Portal.tsx b/excalidraw-app/collab/Portal.tsx
index 2e076a661e..9083246613 100644
--- a/excalidraw-app/collab/Portal.tsx
+++ b/excalidraw-app/collab/Portal.tsx
@@ -252,6 +252,20 @@ class Portal {
       this.socket.emit(WS_EVENTS.USER_FOLLOW_CHANGE, payload);
     }
   };
+
+  broadcastRoomDeletion = async () => {
+    if (this.socket?.id) {
+      const data: SocketUpdateDataSource["ROOM_DELETED"] = {
+        type: WS_SUBTYPES.DELETE,
+        payload: {
+          socketId: this.socket.id as SocketId,
+          roomId: this.roomId!,
+        },
+      };
+
+      this._broadcastSocketData(data as SocketUpdateData);
+    }
+  };
 }
 
 export default Portal;
diff --git a/excalidraw-app/data/firebase.ts b/excalidraw-app/data/firebase.ts
index 568054f7ef..82b342ef73 100644
--- a/excalidraw-app/data/firebase.ts
+++ b/excalidraw-app/data/firebase.ts
@@ -315,3 +315,10 @@ export const loadFilesFromFirebase = async (
 
   return { loadedFiles, erroredFiles };
 };
+
+export const deleteRoomFromFirebase = async (
+  roomId: string,
+  roomKey: string,
+): Promise<void> => {
+  // TODO: delete the room...
+};
diff --git a/excalidraw-app/data/index.ts b/excalidraw-app/data/index.ts
index 75aa278779..2ec32faf68 100644
--- a/excalidraw-app/data/index.ts
+++ b/excalidraw-app/data/index.ts
@@ -119,6 +119,13 @@ export type SocketUpdateDataSource = {
       username: string;
     };
   };
+  ROOM_DELETED: {
+    type: WS_SUBTYPES.DELETE;
+    payload: {
+      socketId: SocketId;
+      roomId: string;
+    };
+  };
 };
 
 export type SocketUpdateDataIncoming =
@@ -310,7 +317,7 @@ export const exportToBackend = async (
 
     const response = await fetch(BACKEND_V2_POST, {
       method: "POST",
-      body: payload.buffer,
+      body: new Uint8Array(payload.buffer),
     });
     const json = await response.json();
     if (json.id) {
diff --git a/excalidraw-app/data/roomManager.ts b/excalidraw-app/data/roomManager.ts
index b3c2ff60d3..0d7cff11c3 100644
--- a/excalidraw-app/data/roomManager.ts
+++ b/excalidraw-app/data/roomManager.ts
@@ -186,7 +186,7 @@ class RoomManager {
         return false;
       }
 
-      const [, roomId] = match;
+      const roomId = match[1];
       return rooms.some((room) => room.roomId === roomId);
     } catch (error) {
       console.warn("Failed to check room ownership:", error);
diff --git a/excalidraw-app/share/ShareDialog.tsx b/excalidraw-app/share/ShareDialog.tsx
index 50b5cabe8e..643ee0a0fe 100644
--- a/excalidraw-app/share/ShareDialog.tsx
+++ b/excalidraw-app/share/ShareDialog.tsx
@@ -198,10 +198,10 @@ const ActiveRoomDialog = ({
             color="danger"
             onClick={() => {
               trackEvent("share", "room deleted");
-              // TODO: handle deletion
-              // 1. stop collaboration (for all users?)
-              // 2. delete room from backend (firebase)
-              // 3. close
+              collabAPI.deleteRoom();
+              if (!collabAPI.isCollaborating()) {
+                handleClose();
+              }
             }}
           />
         )}
diff --git a/packages/excalidraw/locales/en.json b/packages/excalidraw/locales/en.json
index f40cbf73fe..b180e58ba0 100644
--- a/packages/excalidraw/locales/en.json
+++ b/packages/excalidraw/locales/en.json
@@ -253,7 +253,8 @@
     "resetLibrary": "This will clear your library. Are you sure?",
     "removeItemsFromsLibrary": "Delete {{count}} item(s) from library?",
     "invalidEncryptionKey": "Encryption key must be of 22 characters. Live collaboration is disabled.",
-    "collabOfflineWarning": "No internet connection available.\nYour changes will not be saved!"
+    "collabOfflineWarning": "No internet connection available.\nYour changes will not be saved!",
+    "collabRoomDeleted": "This collab room has been deleted by its owner."
   },
   "errors": {
     "unsupportedFileType": "Unsupported file type.",
@@ -280,7 +281,8 @@
     },
     "asyncPasteFailedOnRead": "Couldn't paste (couldn't read from system clipboard).",
     "asyncPasteFailedOnParse": "Couldn't paste.",
-    "copyToSystemClipboardFailed": "Couldn't copy to clipboard."
+    "copyToSystemClipboardFailed": "Couldn't copy to clipboard.",
+    "roomDeletionFailed": "Couldn't delete the collaboration room."
   },
   "toolBar": {
     "selection": "Selection",