diff --git a/packages/snjs/lib/Domain/UseCase/SignInWithRecoveryCodes/SignInWithRecoveryCodes.ts b/packages/snjs/lib/Domain/UseCase/SignInWithRecoveryCodes/SignInWithRecoveryCodes.ts
index e5e66a769..43028ebfd 100644
--- a/packages/snjs/lib/Domain/UseCase/SignInWithRecoveryCodes/SignInWithRecoveryCodes.ts
+++ b/packages/snjs/lib/Domain/UseCase/SignInWithRecoveryCodes/SignInWithRecoveryCodes.ts
@@ -103,7 +103,7 @@ export class SignInWithRecoveryCodes implements UseCaseInterface<void> {
         payload: {
           payload: {
             ephemeral: false,
-            mergeLocal: false,
+            mergeLocal: dto.mergeLocal ?? true,
             awaitSync: true,
             checkIntegrity: false,
           },
diff --git a/packages/snjs/lib/Domain/UseCase/SignInWithRecoveryCodes/SignInWithRecoveryCodesDTO.ts b/packages/snjs/lib/Domain/UseCase/SignInWithRecoveryCodes/SignInWithRecoveryCodesDTO.ts
index ed37d6600..0e469bff4 100644
--- a/packages/snjs/lib/Domain/UseCase/SignInWithRecoveryCodes/SignInWithRecoveryCodesDTO.ts
+++ b/packages/snjs/lib/Domain/UseCase/SignInWithRecoveryCodes/SignInWithRecoveryCodesDTO.ts
@@ -3,4 +3,5 @@ export interface SignInWithRecoveryCodesDTO {
   username: string
   password: string
   hvmToken?: string
+  mergeLocal?: boolean
 }
diff --git a/packages/web/src/javascripts/Components/AccountMenu/ConfirmNoMergeDialog.tsx b/packages/web/src/javascripts/Components/AccountMenu/ConfirmNoMergeDialog.tsx
new file mode 100644
index 000000000..7888be217
--- /dev/null
+++ b/packages/web/src/javascripts/Components/AccountMenu/ConfirmNoMergeDialog.tsx
@@ -0,0 +1,41 @@
+import AlertDialog from '@/Components/AlertDialog/AlertDialog'
+import Button from '@/Components/Button/Button'
+import Icon from '@/Components/Icon/Icon'
+import { FunctionComponent } from 'react'
+
+type Props = {
+  onClose: () => void
+  onConfirm: () => void
+}
+
+const ConfirmNoMergeDialog: FunctionComponent<Props> = ({ onClose, onConfirm }) => {
+  return (
+    <AlertDialog closeDialog={onClose}>
+      <div className="flex items-center justify-between text-lg font-bold">
+        Delete local data?
+        <button className="rounded p-1 font-bold hover:bg-contrast" onClick={onClose}>
+          <Icon type="close" />
+        </button>
+      </div>
+      <div className="sk-panel-row">
+        <div>
+          <p className="text-base text-foreground lg:text-sm">
+            You have chosen not to merge your local data. If you proceed, your local notes and tags will be permanently
+            deleted and replaced with data from your account. This action cannot be undone.
+          </p>
+          <p className="mt-2 text-base font-semibold text-danger lg:text-sm">
+            Are you sure you want to continue without merging?
+          </p>
+        </div>
+      </div>
+      <div className="mt-4 flex justify-end gap-2">
+        <Button onClick={onClose}>Cancel</Button>
+        <Button primary colorStyle="danger" onClick={onConfirm}>
+          Delete Local Data and Continue
+        </Button>
+      </div>
+    </AlertDialog>
+  )
+}
+
+export default ConfirmNoMergeDialog
diff --git a/packages/web/src/javascripts/Components/AccountMenu/ConfirmPassword.tsx b/packages/web/src/javascripts/Components/AccountMenu/ConfirmPassword.tsx
index 3a20e8217..673abc0ab 100644
--- a/packages/web/src/javascripts/Components/AccountMenu/ConfirmPassword.tsx
+++ b/packages/web/src/javascripts/Components/AccountMenu/ConfirmPassword.tsx
@@ -18,6 +18,8 @@ import IconButton from '@/Components/Button/IconButton'
 import { useApplication } from '../ApplicationProvider'
 import { useCaptcha } from '@/Hooks/useCaptcha'
 import { isErrorResponse } from '@standardnotes/snjs'
+import MergeLocalDataCheckbox from './MergeLocalDataCheckbox'
+import ConfirmNoMergeDialog from './ConfirmNoMergeDialog'
 
 type Props = {
   setMenuPane: (pane: AccountMenuPane) => void
@@ -37,6 +39,7 @@ const ConfirmPassword: FunctionComponent<Props> = ({ setMenuPane, email, passwor
 
   const [hvmToken, setHVMToken] = useState('')
   const [captchaURL, setCaptchaURL] = useState('')
+  const [showNoMergeConfirmation, setShowNoMergeConfirmation] = useState(false)
 
   const register = useCallback(() => {
     setIsRegistering(true)
@@ -124,9 +127,14 @@ const ConfirmPassword: FunctionComponent<Props> = ({ setMenuPane, email, passwor
         return
       }
 
+      if (notesAndTagsCount > 0 && !shouldMergeLocal) {
+        setShowNoMergeConfirmation(true)
+        return
+      }
+
       checkIfCaptchaRequiredAndRegister()
     },
-    [checkIfCaptchaRequiredAndRegister, confirmPassword, password],
+    [checkIfCaptchaRequiredAndRegister, confirmPassword, password, notesAndTagsCount, shouldMergeLocal],
   )
 
   const handleKeyDown: KeyboardEventHandler = useCallback(
@@ -145,6 +153,15 @@ const ConfirmPassword: FunctionComponent<Props> = ({ setMenuPane, email, passwor
     setMenuPane(AccountMenuPane.Register)
   }, [setMenuPane])
 
+  const closeNoMergeConfirmation = useCallback(() => {
+    setShowNoMergeConfirmation(false)
+  }, [])
+
+  const confirmRegisterWithoutMerge = useCallback(() => {
+    setShowNoMergeConfirmation(false)
+    checkIfCaptchaRequiredAndRegister()
+  }, [checkIfCaptchaRequiredAndRegister])
+
   const confirmPasswordForm = (
     <>
       <div className="mb-3 px-3 text-sm">
@@ -182,12 +199,11 @@ const ConfirmPassword: FunctionComponent<Props> = ({ setMenuPane, email, passwor
           disabled={isRegistering}
         />
         {notesAndTagsCount > 0 ? (
-          <Checkbox
-            name="should-merge-local"
-            label={`Merge local data (${notesAndTagsCount} notes and tags)`}
+          <MergeLocalDataCheckbox
             checked={shouldMergeLocal}
             onChange={handleShouldMergeChange}
             disabled={isRegistering}
+            notesAndTagsCount={notesAndTagsCount}
           />
         ) : null}
       </form>
@@ -208,6 +224,9 @@ const ConfirmPassword: FunctionComponent<Props> = ({ setMenuPane, email, passwor
         <div className="text-base font-bold">{captchaURL ? 'Human verification' : 'Confirm password'}</div>
       </div>
       {captchaURL ? <div className="p-[10px]">{captchaIframe}</div> : confirmPasswordForm}
+      {showNoMergeConfirmation && (
+        <ConfirmNoMergeDialog onClose={closeNoMergeConfirmation} onConfirm={confirmRegisterWithoutMerge} />
+      )}
     </>
   )
 }
diff --git a/packages/web/src/javascripts/Components/AccountMenu/MergeLocalDataCheckbox.tsx b/packages/web/src/javascripts/Components/AccountMenu/MergeLocalDataCheckbox.tsx
new file mode 100644
index 000000000..cd2e10b2c
--- /dev/null
+++ b/packages/web/src/javascripts/Components/AccountMenu/MergeLocalDataCheckbox.tsx
@@ -0,0 +1,38 @@
+import Icon from '@/Components/Icon/Icon'
+import StyledTooltip from '@/Components/StyledTooltip/StyledTooltip'
+import { ChangeEventHandler, FunctionComponent } from 'react'
+
+type Props = {
+  checked: boolean
+  onChange: ChangeEventHandler<HTMLInputElement>
+  disabled?: boolean
+  notesAndTagsCount: number
+}
+
+const MergeLocalDataCheckbox: FunctionComponent<Props> = ({ checked, onChange, disabled, notesAndTagsCount }) => {
+  return (
+    <label htmlFor="should-merge-local" className="fit-content mb-2 flex items-center text-sm">
+      <input
+        className="mr-2 accent-danger"
+        type="checkbox"
+        name="should-merge-local"
+        id="should-merge-local"
+        checked={checked}
+        onChange={onChange}
+        disabled={disabled}
+      />
+      <span className="text-danger">Merge local data ({notesAndTagsCount} notes and tags)</span>
+      <StyledTooltip
+        label="If unchecked, your local notes and tags will be permanently deleted and replaced with data from your account."
+        showOnMobile
+        className="!z-modal !max-w-[30ch] whitespace-normal"
+      >
+        <button type="button" className="ml-1 rounded-full p-0.5 hover:bg-contrast">
+          <Icon type="info" className="text-danger" size="small" />
+        </button>
+      </StyledTooltip>
+    </label>
+  )
+}
+
+export default MergeLocalDataCheckbox
diff --git a/packages/web/src/javascripts/Components/AccountMenu/SignIn.tsx b/packages/web/src/javascripts/Components/AccountMenu/SignIn.tsx
index 63d38d8cc..4ad8dc3c1 100644
--- a/packages/web/src/javascripts/Components/AccountMenu/SignIn.tsx
+++ b/packages/web/src/javascripts/Components/AccountMenu/SignIn.tsx
@@ -13,6 +13,8 @@ import HorizontalSeparator from '../Shared/HorizontalSeparator'
 import { getErrorFromErrorResponse, isErrorResponse, getCaptchaHeader } from '@standardnotes/snjs'
 import { useApplication } from '../ApplicationProvider'
 import { useCaptcha } from '@/Hooks/useCaptcha'
+import MergeLocalDataCheckbox from './MergeLocalDataCheckbox'
+import ConfirmNoMergeDialog from './ConfirmNoMergeDialog'
 
 type Props = {
   setMenuPane: (pane: AccountMenuPane) => void
@@ -34,6 +36,7 @@ const SignInPane: FunctionComponent<Props> = ({ setMenuPane }) => {
   const [isPrivateUsername, setIsPrivateUsername] = useState(false)
 
   const [isRecoverySignIn, setIsRecoverySignIn] = useState(false)
+  const [showNoMergeConfirmation, setShowNoMergeConfirmation] = useState(false)
 
   const [captchaURL, setCaptchaURL] = useState('')
   const [showCaptcha, setShowCaptcha] = useState(false)
@@ -139,6 +142,7 @@ const SignInPane: FunctionComponent<Props> = ({ setMenuPane }) => {
         username: email,
         password: password,
         hvmToken,
+        mergeLocal: shouldMergeLocal,
       })
       .then((result) => {
         if (result.isFailed()) {
@@ -166,7 +170,15 @@ const SignInPane: FunctionComponent<Props> = ({ setMenuPane }) => {
       .finally(() => {
         setIsSigningIn(false)
       })
-  }, [application.accountMenuController, application.signInWithRecoveryCodes, email, hvmToken, password, recoveryCodes])
+  }, [
+    application.accountMenuController,
+    application.signInWithRecoveryCodes,
+    email,
+    hvmToken,
+    password,
+    recoveryCodes,
+    shouldMergeLocal,
+  ])
 
   const onPrivateUsernameChange = useCallback(
     (newisPrivateUsername: boolean, privateUsernameIdentifier?: string) => {
@@ -189,13 +201,18 @@ const SignInPane: FunctionComponent<Props> = ({ setMenuPane }) => {
       return
     }
 
+    if (notesAndTagsCount > 0 && !shouldMergeLocal) {
+      setShowNoMergeConfirmation(true)
+      return
+    }
+
     if (isRecoverySignIn) {
       recoverySignIn()
       return
     }
 
     signIn()
-  }, [email, isRecoverySignIn, password, recoverySignIn, signIn])
+  }, [email, isRecoverySignIn, password, recoverySignIn, signIn, notesAndTagsCount, shouldMergeLocal])
 
   const handleSignInFormSubmit = useCallback(
     (e: React.SyntheticEvent) => {
@@ -272,12 +289,11 @@ const SignInPane: FunctionComponent<Props> = ({ setMenuPane }) => {
           onChange={handleEphemeralChange}
         />
         {notesAndTagsCount > 0 ? (
-          <Checkbox
-            name="should-merge-local"
-            label={`Merge local data (${notesAndTagsCount} notes and tags)`}
+          <MergeLocalDataCheckbox
             checked={shouldMergeLocal}
-            disabled={isSigningIn}
             onChange={handleShouldMergeChange}
+            disabled={isSigningIn}
+            notesAndTagsCount={notesAndTagsCount}
           />
         ) : null}
       </div>
@@ -291,6 +307,19 @@ const SignInPane: FunctionComponent<Props> = ({ setMenuPane }) => {
     </>
   )
 
+  const closeNoMergeConfirmation = useCallback(() => {
+    setShowNoMergeConfirmation(false)
+  }, [])
+
+  const confirmSignInWithoutMerge = useCallback(() => {
+    setShowNoMergeConfirmation(false)
+    if (isRecoverySignIn) {
+      recoverySignIn()
+    } else {
+      signIn()
+    }
+  }, [signIn, isRecoverySignIn, recoverySignIn])
+
   return (
     <>
       <div className="mb-3 mt-1 flex items-center px-3">
@@ -305,6 +334,9 @@ const SignInPane: FunctionComponent<Props> = ({ setMenuPane }) => {
         <div className="text-base font-bold">{showCaptcha ? 'Human verification' : 'Sign in'}</div>
       </div>
       {showCaptcha ? <div className="p-[10px]">{captchaIframe}</div> : signInForm}
+      {showNoMergeConfirmation && (
+        <ConfirmNoMergeDialog onClose={closeNoMergeConfirmation} onConfirm={confirmSignInWithoutMerge} />
+      )}
     </>
   )
 }