diff --git a/web/src/settings/AISettingsPage.module.css b/web/src/settings/AISettingsPage.module.css
index 6b0924d..6ca3105 100644
--- a/web/src/settings/AISettingsPage.module.css
+++ b/web/src/settings/AISettingsPage.module.css
@@ -304,3 +304,9 @@
 .fill .textarea {
   resize: none;
 }
+
+/* A form locked while its save is pending, so no edit is made that the
+   saved settings would then replace. It lays out as if it were not there. */
+.lock {
+  display: contents;
+}
diff --git a/web/src/settings/AISettingsPage.test.tsx b/web/src/settings/AISettingsPage.test.tsx
index 1ad7dbd..73e68c7 100644
--- a/web/src/settings/AISettingsPage.test.tsx
+++ b/web/src/settings/AISettingsPage.test.tsx
@@ -407,6 +407,30 @@ describe('AISettingsPage', () => {
     expect(unload()).toBe(true)
   })
 
+  it('locks the form while a save is pending, and guards leaving until the save lands', async () => {
+    let answer: (response: Response) => void = () => {}
+    stubAPI({ 'PATCH /api/v1/settings/ai': () => new Promise<Response>((resolve) => (answer = resolve)) })
+    await renderPage()
+    const unload = () => {
+      const event = new Event('beforeunload', { cancelable: true })
+      act(() => void window.dispatchEvent(event))
+      return event.defaultPrevented
+    }
+    fireEvent.change(prompt(), { target: { value: 'Keep it cozy.' } })
+    fireEvent.click(save())
+
+    expect(await screen.findByRole('button', { name: 'Saving…' })).toBeDisabled()
+    for (const field of [provider(), model(), slider(), prompt()]) expect(field).toBeDisabled()
+    expect(screen.getByRole('button', { name: 'Reset' })).toBeDisabled()
+    expect(unload()).toBe(true)
+
+    answer(jsonResponse(200, { ...AI_SETTINGS, system_prompt: 'Keep it cozy.' }))
+    expect(await screen.findByText('Changes saved.')).toBeInTheDocument()
+    expect(prompt()).toBeEnabled()
+    expect(prompt()).toHaveValue('Keep it cozy.')
+    await waitFor(() => expect(unload()).toBe(false))
+  })
+
   it('keeps 44 px tap targets', async () => {
     stubAPI()
     await renderPage()
@@ -680,6 +704,29 @@ describe('Recipe search card', () => {
     expect(await screen.findByTestId('path')).toHaveTextContent('/settings')
   })
 
+  it('locks the card while a save is pending, and guards leaving until the save lands', async () => {
+    let answer: (response: Response) => void = () => {}
+    stubAPI({ 'PATCH /api/v1/settings/recipe-search': () => new Promise<Response>((resolve) => (answer = resolve)) })
+    await renderCard()
+    const unload = () => {
+      const event = new Event('beforeunload', { cancelable: true })
+      act(() => void window.dispatchEvent(event))
+      return event.defaultPrevented
+    }
+    fireEvent.change(url(), { target: { value: 'https://search.example' } })
+    fireEvent.click(saveSearch())
+
+    expect(await within(card()).findByRole('button', { name: 'Saving…' })).toBeDisabled()
+    for (const field of [url(), searxng(), brave()]) expect(field).toBeDisabled()
+    expect(unload()).toBe(true)
+
+    answer(jsonResponse(200, { ...RECIPE_SEARCH_SETTINGS, base_url: 'https://search.example' }))
+    expect(await within(card()).findByText('Recipe search saved.')).toBeInTheDocument()
+    expect(url()).toBeEnabled()
+    expect(url()).toHaveValue('https://search.example')
+    await waitFor(() => expect(unload()).toBe(false))
+  })
+
   it('keeps 44 px tap targets', async () => {
     stubAPI({ 'GET /api/v1/settings/recipe-search': () => jsonResponse(200, BRAVE_SETTINGS) })
     await renderCard()
diff --git a/web/src/settings/AISettingsPage.tsx b/web/src/settings/AISettingsPage.tsx
index 10fc7fc..992bc15 100644
--- a/web/src/settings/AISettingsPage.tsx
+++ b/web/src/settings/AISettingsPage.tsx
@@ -201,7 +201,7 @@ function AISettingsForm({ saved, onDirtyChange }: AISettingsFormProps) {
   }
 
   return (
-    <>
+    <fieldset className={styles.lock} disabled={save.isPending}>
       <div className={styles.columns}>
         <Select
           label="Provider"
@@ -325,7 +325,7 @@ function AISettingsForm({ saved, onDirtyChange }: AISettingsFormProps) {
       >
         This restores MealQuest's default system prompt for everyone in the household.
       </Confirm>
-    </>
+    </fieldset>
   )
 }
 
diff --git a/web/src/settings/HouseholdSettingsPage.module.css b/web/src/settings/HouseholdSettingsPage.module.css
index 0ae02bc..2fcfbd4 100644
--- a/web/src/settings/HouseholdSettingsPage.module.css
+++ b/web/src/settings/HouseholdSettingsPage.module.css
@@ -229,3 +229,9 @@
 .check {
   flex: none;
 }
+
+/* A form locked while its save is pending, so no edit is made that the
+   saved settings would then replace. It lays out as if it were not there. */
+.lock {
+  display: contents;
+}
diff --git a/web/src/settings/HouseholdSettingsPage.test.tsx b/web/src/settings/HouseholdSettingsPage.test.tsx
index a42e055..21716d3 100644
--- a/web/src/settings/HouseholdSettingsPage.test.tsx
+++ b/web/src/settings/HouseholdSettingsPage.test.tsx
@@ -1,5 +1,5 @@
 import { QueryClientProvider } from '@tanstack/react-query'
-import { fireEvent, render, screen, waitFor, within } from '@testing-library/react'
+import { act, fireEvent, render, screen, waitFor, within } from '@testing-library/react'
 import { Route, Routes, useLocation } from 'react-router'
 import { afterEach, describe, expect, it, vi, type Mock } from 'vitest'
 import { ApiProvider, ApiError, createApiClient, createQueryClient, createVerifiedSession } from '../api/index.ts'
@@ -293,6 +293,34 @@ describe('HouseholdSettingsPage', () => {
     expect(await screen.findByTestId('path')).toHaveTextContent('/settings')
   })
 
+  it('locks the form while a save is pending, and guards leaving until the save lands', async () => {
+    let answer: (response: Response) => void = () => {}
+    stubAPI({
+      'PATCH /api/v1/settings/household': () => new Promise<Response>((resolve) => (answer = resolve)),
+    })
+    await renderPage()
+    const unload = () => {
+      const event = new Event('beforeunload', { cancelable: true })
+      act(() => void window.dispatchEvent(event))
+      return event.defaultPrevented
+    }
+    fireEvent.change(input('Dinner time'), { target: { value: '18:15' } })
+    fireEvent.click(save())
+
+    expect(await screen.findByRole('button', { name: 'Saving…' })).toBeDisabled()
+    for (const field of ['Dinner time', 'Day-of reminder', 'Plan draft day', 'Google Chat Supply run time']) {
+      expect(input(field)).toBeDisabled()
+    }
+    expect(screen.getByRole('button', { name: 'Change' })).toBeDisabled()
+    expect(unload()).toBe(true)
+
+    answer(jsonResponse(200, { ...HOUSEHOLD_SETTINGS, dinner_time: '18:15' }))
+    expect(await screen.findByText('Changes saved.')).toBeInTheDocument()
+    expect(input('Dinner time')).toBeEnabled()
+    expect(input('Dinner time')).toHaveValue('18:15')
+    await waitFor(() => expect(unload()).toBe(false))
+  })
+
   it('leaves without asking when nothing changed', async () => {
     stubAPI()
     await renderPage()
diff --git a/web/src/settings/HouseholdSettingsPage.tsx b/web/src/settings/HouseholdSettingsPage.tsx
index e9f4f4a..34907fd 100644
--- a/web/src/settings/HouseholdSettingsPage.tsx
+++ b/web/src/settings/HouseholdSettingsPage.tsx
@@ -113,7 +113,7 @@ function HouseholdSettingsForm({ saved, onDirtyChange }: HouseholdSettingsFormPr
   }
 
   return (
-    <>
+    <fieldset className={styles.lock} disabled={save.isPending}>
       <Section title="Time zone">
         <TimeZoneField
           value={draft.timezone}
@@ -202,7 +202,7 @@ function HouseholdSettingsForm({ saved, onDirtyChange }: HouseholdSettingsFormPr
           {save.isPending ? 'Saving…' : 'Save changes'}
         </Button>
       </div>
-    </>
+    </fieldset>
   )
 }
 
diff --git a/web/src/settings/RecipeSearchCard.tsx b/web/src/settings/RecipeSearchCard.tsx
index 7cf7daf..590d9ce 100644
--- a/web/src/settings/RecipeSearchCard.tsx
+++ b/web/src/settings/RecipeSearchCard.tsx
@@ -119,7 +119,7 @@ function RecipeSearchForm({ saved, onDirtyChange }: { saved: RecipeSearchSetting
   }
 
   return (
-    <>
+    <fieldset className={styles.lock} disabled={save.isPending}>
       <Segmented
         label="Recipe search provider"
         options={providerOptions}
@@ -173,7 +173,7 @@ function RecipeSearchForm({ saved, onDirtyChange }: { saved: RecipeSearchSetting
           {save.isPending ? 'Saving…' : 'Save recipe search'}
         </Button>
       </div>
-    </>
+    </fieldset>
   )
 }