diff --git a/src/core/browser.test.ts b/src/core/browser.test.ts
new file mode 100644
index 0000000..8ac4574
--- /dev/null
+++ b/src/core/browser.test.ts
@@ -0,0 +1,21 @@
+import { describe, expect, it, vi } from 'vitest'
+import { openGenerationInBrowser } from './browser.js'
+
+describe('openGenerationInBrowser', () => {
+  it('opens encoded generation URL and returns null on success', async () => {
+    const openUrl = vi.fn(async (_target: string) => undefined)
+    const error = await openGenerationInBrowser('gen/with spaces', openUrl)
+
+    expect(error).toBeNull()
+    expect(openUrl).toHaveBeenCalledWith('https://www.pixelmuse.studio/g/gen%2Fwith%20spaces')
+  })
+
+  it('returns readable error when open fails', async () => {
+    const openUrl = vi.fn(async (_target: string) => {
+      throw new Error('No browser available')
+    })
+    const error = await openGenerationInBrowser('abc123', openUrl)
+
+    expect(error).toBe('No browser available')
+  })
+})
diff --git a/src/core/browser.ts b/src/core/browser.ts
new file mode 100644
index 0000000..a8c2c4c
--- /dev/null
+++ b/src/core/browser.ts
@@ -0,0 +1,16 @@
+const GALLERY_URL_BASE = 'https://www.pixelmuse.studio/g/'
+
+export async function openGenerationInBrowser(
+  generationId: string,
+  openUrl: (target: string) => Promise<unknown>,
+): Promise<string | null> {
+  const generationUrl = `${GALLERY_URL_BASE}${encodeURIComponent(generationId)}`
+
+  try {
+    await openUrl(generationUrl)
+    return null
+  } catch (err) {
+    if (err instanceof Error && err.message) return err.message
+    return 'Failed to open browser'
+  }
+}
diff --git a/src/core/index.ts b/src/core/index.ts
index c1d5d55..133e8c5 100644
--- a/src/core/index.ts
+++ b/src/core/index.ts
@@ -38,3 +38,4 @@ export { timeAgo } from './utils.js'
 export { initiateDeviceAuth, pollForToken } from './device-auth.js'
 export { detectEditors, configureMcp, type EditorInfo } from './mcp-config.js'
 export { buildMacClipboardArgs } from './clipboard.js'
+export { openGenerationInBrowser } from './browser.js'
diff --git a/src/screens/GalleryDetail.tsx b/src/screens/GalleryDetail.tsx
index 5953137..9e16798 100644
--- a/src/screens/GalleryDetail.tsx
+++ b/src/screens/GalleryDetail.tsx
@@ -5,6 +5,7 @@ import open from 'open'
 import type { PixelmuseClient } from '../core/client.js'
 import type { Generation } from '../core/types.js'
 import { imageToBuffer, autoSave } from '../core/image.js'
+import { openGenerationInBrowser } from '../core/browser.js'
 import ImagePreview from '../components/ImagePreview.js'
 
 interface Props {
@@ -49,7 +50,12 @@ export default function GalleryDetail({ client, generationId, back }: Props) {
     if (confirming) return
     if (input === 'd') setConfirming(true)
     if (input === 'o' && generation) {
-      open(`https://www.pixelmuse.studio/g/${generation.id}`)
+      void (async () => {
+        const openError = await openGenerationInBrowser(generation.id, open)
+        if (openError) {
+          setError(openError)
+        }
+      })()
     }
   })