diff --git a/src/modules/core/components/user.avatar.component.vue b/src/modules/core/components/user.avatar.component.vue
index 3c3d14f36..8342874af 100644
--- a/src/modules/core/components/user.avatar.component.vue
+++ b/src/modules/core/components/user.avatar.component.vue
@@ -12,7 +12,7 @@
       >
         <v-img
           v-if="hasAvatar"
-          :src="setImages(config.api, user.avatar, size * 2, null)"
+          :src="setImages(config.api, user.avatar, avatarSize, null)"
           :alt="fullName"
         />
         <span v-else :class="textColorClass" :style="{ fontSize: `${Math.max(size * 0.4, 10)}px`, fontWeight: 500 }">
@@ -31,6 +31,15 @@
  * Color is derived from email hash for consistency.
  */
 
+/**
+ * Allowed avatar sizes served by the backend `/api/uploads/images/` endpoint.
+ * Mirrors the sharp-resize whitelist in devkit Node
+ * `modules/uploads/config/uploads.{env}.config.js` (field `uploads.avatar.sharp.sizes`).
+ * Any value outside this list returns HTTP 422 "Wrong size param" — if you
+ * change one, update the other.
+ */
+const SHARP_SIZES = [128, 256, 512, 1024];
+
 /**
  * Determine whether a hex color is light (needs dark text for contrast).
  * Uses relative luminance per WCAG 2.x.
@@ -80,6 +89,16 @@ export default {
     hasAvatar() {
       return !!(this.user && this.user.avatar && this.user.avatar !== '');
     },
+    /**
+     * Snap the requested avatar size (doubled for retina) to the backend
+     * sharp whitelist. Any value outside `SHARP_SIZES` would return HTTP 422,
+     * so we pick the smallest allowed size that fits — or cap at the largest.
+     * @returns {number} A size from `SHARP_SIZES` (128, 256, 512, or 1024).
+     */
+    avatarSize() {
+      const requested = this.size * 2;
+      return SHARP_SIZES.find((s) => s >= requested) ?? SHARP_SIZES[SHARP_SIZES.length - 1];
+    },
     initials() {
       if (!this.user) return '';
       const f = (this.user.firstName || '').charAt(0).toUpperCase();
diff --git a/src/modules/core/tests/user.avatar.component.unit.tests.js b/src/modules/core/tests/user.avatar.component.unit.tests.js
index 0dd80fe51..f7fce23c5 100644
--- a/src/modules/core/tests/user.avatar.component.unit.tests.js
+++ b/src/modules/core/tests/user.avatar.component.unit.tests.js
@@ -2,7 +2,7 @@ import { mount } from '@vue/test-utils';
 import { createVuetify } from 'vuetify';
 import * as components from 'vuetify/components';
 import * as directives from 'vuetify/directives';
-import { describe, it, expect, beforeEach } from 'vitest';
+import { describe, it, expect, beforeEach, vi } from 'vitest';
 import UserAvatarComponent from '../components/user.avatar.component.vue';
 
 const mockConfig = {
@@ -86,6 +86,47 @@ describe('user.avatar.component', () => {
     });
   });
 
+  describe('avatarSize computed', () => {
+    it('snaps size=24 (requested 48) to 128', () => {
+      const wrapper = createWrapper({ user: { email: 'a@b.com' }, size: 24 });
+      expect(wrapper.vm.avatarSize).toBe(128);
+    });
+
+    it('snaps size=64 (requested 128) to 128', () => {
+      const wrapper = createWrapper({ user: { email: 'a@b.com' }, size: 64 });
+      expect(wrapper.vm.avatarSize).toBe(128);
+    });
+
+    it('snaps size=200 (requested 400) to 512', () => {
+      const wrapper = createWrapper({ user: { email: 'a@b.com' }, size: 200 });
+      expect(wrapper.vm.avatarSize).toBe(512);
+    });
+
+    it('snaps size=512 (requested 1024) to 1024', () => {
+      const wrapper = createWrapper({ user: { email: 'a@b.com' }, size: 512 });
+      expect(wrapper.vm.avatarSize).toBe(1024);
+    });
+
+    it('caps size=600 (requested 1200) to 1024', () => {
+      const wrapper = createWrapper({ user: { email: 'a@b.com' }, size: 600 });
+      expect(wrapper.vm.avatarSize).toBe(1024);
+    });
+
+    it('uses snapped size when building avatar image URL', () => {
+      const setImages = vi.fn((api, file, size) => `${api.protocol}://${api.host}:${api.port}/api/uploads/images/${file}-${size}`);
+      const wrapper = mount(UserAvatarComponent, {
+        props: { user: { email: 'a@b.com', avatar: 'photo.jpg' }, size: 200 },
+        global: {
+          plugins: [vuetify],
+          config: { globalProperties: { config: mockConfig, setImages } },
+        },
+      });
+
+      expect(wrapper.vm.avatarSize).toBe(512);
+      expect(setImages).toHaveBeenCalledWith(mockConfig.api, 'photo.jpg', 512, null);
+    });
+  });
+
   describe('hasAvatar computed', () => {
     it('returns true when user has avatar', () => {
       const wrapper = createWrapper({ user: { avatar: 'photo.jpg', email: 'a@b.com' } });