diff --git a/src/domain/avatar.js b/src/domain/avatar.js
index f94ba3b2..5b32020b 100644
--- a/src/domain/avatar.js
+++ b/src/domain/avatar.js
@@ -47,3 +47,11 @@ function hashCode(str) {
 export function getIdentifierColorNumber(id) {
     return (hashCode(id) % 8) + 1;
 }
+
+export function getAvatarHttpUrl(avatarUrl, cssSize, platform, mediaRepository) {
+    if (avatarUrl) {
+        const imageSize = cssSize * platform.devicePixelRatio;
+        return mediaRepository.mxcUrlThumbnail(avatarUrl, imageSize, imageSize, "crop");
+    }
+    return null;
+}
diff --git a/src/domain/session/leftpanel/BaseTileViewModel.js b/src/domain/session/leftpanel/BaseTileViewModel.js
index d4ca3293..360f2b39 100644
--- a/src/domain/session/leftpanel/BaseTileViewModel.js
+++ b/src/domain/session/leftpanel/BaseTileViewModel.js
@@ -15,7 +15,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import {avatarInitials, getIdentifierColorNumber} from "../../avatar.js";
+import {avatarInitials, getIdentifierColorNumber, getAvatarHttpUrl} from "../../avatar.js";
 import {ViewModel} from "../../ViewModel.js";
 
 const KIND_ORDER = ["invite", "room"];
@@ -75,12 +75,8 @@ export class BaseTileViewModel extends ViewModel {
         return getIdentifierColorNumber(this._avatarSource.id);
     }
 
-    get avatarUrl() {
-        if (this._avatarSource.avatarUrl) {
-            const size = 32 * this.platform.devicePixelRatio;
-            return this._avatarSource.mediaRepository.mxcUrlThumbnail(this._avatarSource.avatarUrl, size, size, "crop");
-        }
-        return null;
+    avatarUrl(size) {
+        return getAvatarHttpUrl(this._avatarSource.avatarUrl, size, this.platform, this._avatarSource.mediaRepository);
     }
 
     get avatarTitle() {
diff --git a/src/domain/session/room/InviteViewModel.js b/src/domain/session/room/InviteViewModel.js
index 57691a34..15fcb5a5 100644
--- a/src/domain/session/room/InviteViewModel.js
+++ b/src/domain/session/room/InviteViewModel.js
@@ -15,7 +15,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import {avatarInitials, getIdentifierColorNumber} from "../../avatar.js";
+import {avatarInitials, getIdentifierColorNumber, getAvatarHttpUrl} from "../../avatar.js";
 import {ViewModel} from "../../ViewModel.js";
 
 export class InviteViewModel extends ViewModel {
@@ -60,12 +60,8 @@ export class InviteViewModel extends ViewModel {
         return getIdentifierColorNumber(this._invite.id)
     }
 
-    get avatarUrl() {
-        if (this._invite.avatarUrl) {
-            const size = 128 * this.platform.devicePixelRatio;
-            return this._mediaRepository.mxcUrlThumbnail(this._invite.avatarUrl, size, size, "crop");
-        }
-        return null;
+    avatarUrl(size) {
+        return getAvatarHttpUrl(this._invite.avatarUrl, size, this.platform, this._mediaRepository);
     }
 
     _createRoomDescription() {
@@ -153,12 +149,8 @@ class RoomMemberViewModel {
         return getIdentifierColorNumber(this._member.userId);
     }
 
-    get avatarUrl() {
-        if (this._member.avatarUrl) {
-            const size = 24 * this._platform.devicePixelRatio;
-            return this._mediaRepository.mxcUrlThumbnail(this._member.avatarUrl, size, size, "crop");
-        }
-        return null;
+    avatarUrl(size) {
+        return getAvatarHttpUrl(this._member.avatarUrl, size, this._platform, this._mediaRepository);
     }
 
     get avatarTitle() {
diff --git a/src/domain/session/room/RoomViewModel.js b/src/domain/session/room/RoomViewModel.js
index e3e40c2a..63aa6811 100644
--- a/src/domain/session/room/RoomViewModel.js
+++ b/src/domain/session/room/RoomViewModel.js
@@ -16,7 +16,7 @@ limitations under the License.
 */
 
 import {TimelineViewModel} from "./timeline/TimelineViewModel.js";
-import {avatarInitials, getIdentifierColorNumber} from "../../avatar.js";
+import {avatarInitials, getIdentifierColorNumber, getAvatarHttpUrl} from "../../avatar.js";
 import {ViewModel} from "../../ViewModel.js";
 
 export class RoomViewModel extends ViewModel {
@@ -120,12 +120,8 @@ export class RoomViewModel extends ViewModel {
         return getIdentifierColorNumber(this._room.id)
     }
 
-    get avatarUrl() {
-        if (this._room.avatarUrl) {
-            const size = 32 * this.platform.devicePixelRatio;
-            return this._room.mediaRepository.mxcUrlThumbnail(this._room.avatarUrl, size, size, "crop");
-        }
-        return null;
+    avatarUrl(size) {
+        return getAvatarHttpUrl(this._room.avatarUrl, size, this.platform, this._room.mediaRepository);
     }
 
     get avatarTitle() {
diff --git a/src/domain/session/room/timeline/tiles/MessageTile.js b/src/domain/session/room/timeline/tiles/MessageTile.js
index fe566814..f85f0fca 100644
--- a/src/domain/session/room/timeline/tiles/MessageTile.js
+++ b/src/domain/session/room/timeline/tiles/MessageTile.js
@@ -15,7 +15,7 @@ limitations under the License.
 */
 
 import {SimpleTile} from "./SimpleTile.js";
-import {getIdentifierColorNumber, avatarInitials} from "../../../../avatar.js";
+import {getIdentifierColorNumber, avatarInitials, getAvatarHttpUrl} from "../../../../avatar.js";
 
 export class MessageTile extends SimpleTile {
     constructor(options) {
@@ -50,11 +50,8 @@ export class MessageTile extends SimpleTile {
         return getIdentifierColorNumber(this._entry.sender);
     }
 
-    get avatarUrl() {
-        if (this._entry.avatarUrl) {
-            return this._mediaRepository.mxcUrlThumbnail(this._entry.avatarUrl, 30, 30, "crop");
-        }
-        return null;
+    avatarUrl(size) {
+        return getAvatarHttpUrl(this._entry.avatarUrl, size, this.platform, this._mediaRepository);
     }
 
     get avatarLetter() {
diff --git a/src/platform/web/ui/avatar.js b/src/platform/web/ui/avatar.js
index 596a8a2c..8845f887 100644
--- a/src/platform/web/ui/avatar.js
+++ b/src/platform/web/ui/avatar.js
@@ -37,8 +37,8 @@ export class AvatarView extends BaseUpdateView {
     }
 
     _avatarUrlChanged() {
-        if (this.value.avatarUrl !== this._avatarUrl) {
-            this._avatarUrl = this.value.avatarUrl;
+        if (this.value.avatarUrl(this._size) !== this._avatarUrl) {
+            this._avatarUrl = this.value.avatarUrl(this._size);
             return true;
         }
         return false;
@@ -79,7 +79,7 @@ export class AvatarView extends BaseUpdateView {
         if (this._avatarUrlChanged()) {
             // avatarColorNumber won't change, it's based on room/user id
             const bgColorClass = `usercolor${vm.avatarColorNumber}`;
-            if (vm.avatarUrl) {
+            if (vm.avatarUrl(this._size)) {
                 this._root.replaceChild(renderImg(vm, this._size), this._root.firstChild);
                 this._root.classList.remove(bgColorClass);
             } else {
@@ -87,7 +87,7 @@ export class AvatarView extends BaseUpdateView {
                 this._root.classList.add(bgColorClass);
             }
         }
-        const hasAvatar = !!vm.avatarUrl;
+        const hasAvatar = !!vm.avatarUrl(this._size);
         if (this._avatarTitleChanged() && hasAvatar) {
             const img = this._root.firstChild;
             img.setAttribute("title", vm.avatarTitle);
@@ -104,7 +104,7 @@ export class AvatarView extends BaseUpdateView {
  * @return {Element}
  */
 export function renderStaticAvatar(vm, size, extraClasses = undefined) {
-    const hasAvatar = !!vm.avatarUrl;
+    const hasAvatar = !!vm.avatarUrl(size);
     let avatarClasses = classNames({
         avatar: true,
         [`size-${size}`]: true,
@@ -119,5 +119,5 @@ export function renderStaticAvatar(vm, size, extraClasses = undefined) {
 
 function renderImg(vm, size) {
     const sizeStr = size.toString();
-    return tag.img({src: vm.avatarUrl, width: sizeStr, height: sizeStr, title: vm.avatarTitle});
+    return tag.img({src: vm.avatarUrl(size), width: sizeStr, height: sizeStr, title: vm.avatarTitle});
 }