diff --git a/resources/js/components/profile/ProfileHero.jsx b/resources/js/components/profile/ProfileHero.jsx
index 0e42e38f..e222ff23 100644
--- a/resources/js/components/profile/ProfileHero.jsx
+++ b/resources/js/components/profile/ProfileHero.jsx
@@ -7,10 +7,10 @@ import FollowButton from '../social/FollowButton'
 import FollowersPreview from '../social/FollowersPreview'
 import MutualFollowersBadge from '../social/MutualFollowersBadge'
 import { shinyFlagUrl } from '../../utils/flagUrl'
+import { formatProfileDate, formatProfileNumber } from '../../lib/profileFormatters'
 
 function formatCompactNumber(value) {
-  const numeric = Number(value ?? 0)
-  return numeric.toLocaleString('en-US')
+  return formatProfileNumber(value)
 }
 
 export default function ProfileHero({ user, profile, isOwner, viewerIsFollowing, followerCount, recentFollowers = [], followContext = null, heroBgUrl, countryName, leaderboardRank, extraActions = null }) {
@@ -25,7 +25,7 @@ export default function ProfileHero({ user, profile, isOwner, viewerIsFollowing,
   const uname = user.username || user.name || 'Unknown'
   const displayName = user.name || uname
   const joinDate = user.created_at
-    ? new Date(user.created_at).toLocaleDateString('en-US', { month: 'long', year: 'numeric' })
+    ? formatProfileDate(user.created_at, { month: 'long', year: 'numeric' })
     : null
   const progressPercent = Math.round(Number(user?.progress_percent ?? 0))
   const heroStats = [
diff --git a/resources/js/components/profile/tabs/TabArtworks.hydration.test.jsx b/resources/js/components/profile/tabs/TabArtworks.hydration.test.jsx
new file mode 100644
index 00000000..eefda632
--- /dev/null
+++ b/resources/js/components/profile/tabs/TabArtworks.hydration.test.jsx
@@ -0,0 +1,46 @@
+import React from 'react'
+import { hydrateRoot } from 'react-dom/client'
+import { renderToString } from 'react-dom/server'
+import { afterEach, describe, expect, it, vi } from 'vitest'
+
+vi.mock('../../artwork/ArtworkGallery', () => ({
+  default: () => <div data-testid="mock-artwork-gallery" />,
+}))
+
+import TabArtworks from './TabArtworks'
+
+describe('TabArtworks SSR hydration formatting', () => {
+  afterEach(() => {
+    vi.restoreAllMocks()
+  })
+
+  it('hydrates formatted artwork statistics without recoverable mismatches', async () => {
+    vi.stubGlobal('fetch', vi.fn(async () => ({ ok: false })))
+    const props = {
+      artworks: [],
+      featuredArtworks: [{
+        id: 1,
+        name: 'Featured artwork',
+        views: 9529106,
+        likes: 1216,
+        downloads: 12,
+      }],
+      username: 'alice',
+      galleryUrl: '/@alice/artworks',
+    }
+    const container = document.createElement('div')
+    container.innerHTML = renderToString(<TabArtworks {...props} />)
+    document.body.appendChild(container)
+    const recoverableErrors = []
+
+    hydrateRoot(container, <TabArtworks {...props} />, {
+      onRecoverableError: (error) => recoverableErrors.push(error),
+    })
+
+    await new Promise((resolve) => setTimeout(resolve, 0))
+
+    expect(recoverableErrors).toHaveLength(0)
+    expect(container.textContent).toContain('9,529,106')
+    expect(container.textContent).toContain('1,216')
+  })
+})
diff --git a/resources/js/components/profile/tabs/TabArtworks.jsx b/resources/js/components/profile/tabs/TabArtworks.jsx
index a47071f4..d69522d9 100644
--- a/resources/js/components/profile/tabs/TabArtworks.jsx
+++ b/resources/js/components/profile/tabs/TabArtworks.jsx
@@ -1,5 +1,6 @@
 import React, { useEffect, useMemo, useState } from 'react'
 import ArtworkGallery from '../../artwork/ArtworkGallery'
+import { formatProfileNumber } from '../../../lib/profileFormatters'
 
 function slugify(value) {
   return String(value ?? '')
@@ -9,7 +10,7 @@ function slugify(value) {
 }
 
 function formatNumber(value) {
-  return Number(value ?? 0).toLocaleString()
+  return formatProfileNumber(value)
 }
 
 function sortByPublishedAt(items) {
diff --git a/resources/js/lib/profileFormatters.js b/resources/js/lib/profileFormatters.js
new file mode 100644
index 00000000..9a6305b8
--- /dev/null
+++ b/resources/js/lib/profileFormatters.js
@@ -0,0 +1,19 @@
+const PROFILE_LOCALE = 'en-US'
+const PROFILE_TIME_ZONE = 'UTC'
+
+export function formatProfileNumber(value) {
+  const numeric = Number(value ?? 0)
+  return Number.isFinite(numeric) ? new Intl.NumberFormat(PROFILE_LOCALE).format(numeric) : '0'
+}
+
+export function formatProfileDate(value, options = {}) {
+  if (!value) return null
+
+  const date = value instanceof Date ? value : new Date(value)
+  if (Number.isNaN(date.getTime())) return null
+
+  return new Intl.DateTimeFormat(PROFILE_LOCALE, {
+    ...options,
+    timeZone: PROFILE_TIME_ZONE,
+  }).format(date)
+}
diff --git a/resources/js/lib/profileFormatters.test.js b/resources/js/lib/profileFormatters.test.js
new file mode 100644
index 00000000..249a6d67
--- /dev/null
+++ b/resources/js/lib/profileFormatters.test.js
@@ -0,0 +1,16 @@
+import { describe, expect, it } from 'vitest'
+import { formatProfileDate, formatProfileNumber } from './profileFormatters'
+
+describe('profile formatters', () => {
+  it('uses a stable en-US number format independent of the browser locale', () => {
+    expect(formatProfileNumber(9529106)).toBe('9,529,106')
+  })
+
+  it('uses UTC for stable calendar dates at timezone boundaries', () => {
+    expect(formatProfileDate('2024-01-01T00:30:00.000Z', {
+      month: 'long',
+      day: 'numeric',
+      year: 'numeric',
+    })).toBe('January 1, 2024')
+  })
+})