diff --git a/core/i18n/resources/en/common.js b/core/i18n/resources/en/common.js
index 6e1ca5c97f..2e9b094ff4 100644
--- a/core/i18n/resources/en/common.js
+++ b/core/i18n/resources/en/common.js
@@ -724,6 +724,12 @@ Please refine your query (e.g. adding a filter) to reduce the number of items.
       merge: {
         label: 'Merge',
         confirmLabel: 'Confirm merge',
+        confirmTooManyDifferencesMessage: `**Too many differences**.  
+It seems like the records are very different each other.  
+Many attributes (~{{nodesUpdated}}) will be updated during merge.  
+Continue with merge preview?`,
+        noChangesWillBeApplied: `No changes would be applied to target record.  
+Merge cannot be performed.`,
         performedSuccessfullyMessage: 'Records merge performed successfully!',
         previewTitle: 'Merging preview (record {{keyValues}})',
       },
diff --git a/server/modules/record/api/recordApi.js b/server/modules/record/api/recordApi.js
index 60f7869cbc..6175135e44 100644
--- a/server/modules/record/api/recordApi.js
+++ b/server/modules/record/api/recordApi.js
@@ -368,14 +368,14 @@ export const init = (app) => {
       const { dryRun, surveyId, sourceRecordUuid, targetRecordUuid } = Request.getParams(req)
       const user = Request.getUser(req)
 
-      const { record } = await RecordService.mergeRecords({
+      const { record, nodesCreated, nodesUpdated } = await RecordService.mergeRecords({
         user,
         surveyId,
         sourceRecordUuid,
         targetRecordUuid,
         dryRun,
       })
-      res.json({ record })
+      res.json({ record, nodesCreated, nodesUpdated })
     } catch (error) {
       next(error)
     }
diff --git a/server/modules/record/service/recordService.js b/server/modules/record/service/recordService.js
index 1e710b9afa..aa3cf99858 100644
--- a/server/modules/record/service/recordService.js
+++ b/server/modules/record/service/recordService.js
@@ -478,6 +478,8 @@ export const mergeRecords = async (
       sideEffect: true,
     })(recordTarget)
 
+    const nodesArray = Object.values(nodesUpdated)
+
     if (!dryRun) {
       const logContent = {
         sourceRecordUuid,
@@ -487,8 +489,6 @@ export const mergeRecords = async (
       }
       await ActivityLogService.insert(user, surveyId, ActivityLog.type.recordMerge, logContent, false, tx)
 
-      const nodesArray = Object.values(nodesUpdated)
-
       await persistRecordNodes({ user, survey, record: recordTargetUpdated, nodesArray }, tx)
 
       await RecordManager.updateRecordMergedInto(
@@ -503,5 +503,9 @@ export const mergeRecords = async (
 
       await RecordManager.updateRecordDateModified({ surveyId, recordUuid: targetRecordUuid }, tx)
     }
-    return { record: recordTargetUpdated }
+    return {
+      record: recordTargetUpdated,
+      nodesCreated: nodesArray.filter(Node.isCreated).length,
+      nodesUpdated: nodesArray.filter(Node.isUpdated).length,
+    }
   })
diff --git a/webapp/service/api/data/index.js b/webapp/service/api/data/index.js
index 5380a638cc..96d90ab988 100644
--- a/webapp/service/api/data/index.js
+++ b/webapp/service/api/data/index.js
@@ -155,7 +155,7 @@ export const startRecordsCloneJob = async ({ surveyId, cycleFrom, cycleTo, recor
 export const mergeRecords = async ({ surveyId, sourceRecordUuid, targetRecordUuid, preview = false }) => {
   const uri = `/api/survey/${surveyId}/records/merge`
   const {
-    data: { record },
+    data: { record, nodesCreated, nodesUpdated },
   } = await axios.post(uri, { dryRun: preview, surveyId, sourceRecordUuid, targetRecordUuid })
-  return record
+  return { record, nodesCreated, nodesUpdated }
 }
diff --git a/webapp/store/ui/record/actions/merge.js b/webapp/store/ui/record/actions/merge.js
index d7d9e0b9bc..5babcbb789 100644
--- a/webapp/store/ui/record/actions/merge.js
+++ b/webapp/store/ui/record/actions/merge.js
@@ -1,9 +1,11 @@
 import * as API from '@webapp/service/api'
 import { SurveyState } from '@webapp/store/survey'
-import { LoaderActions, NotificationActions } from '@webapp/store/ui'
+import { DialogConfirmActions, LoaderActions, NotificationActions } from '@webapp/store/ui'
 
 import * as ActionTypes from './actionTypes'
 
+const updatedNodesWarnLimit = 10
+
 export const previewRecordsMerge =
   ({ sourceRecordUuid, targetRecordUuid }) =>
   async (dispatch, getState) => {
@@ -12,11 +14,30 @@ export const previewRecordsMerge =
     const state = getState()
     const surveyId = SurveyState.getSurveyId(state)
 
-    const record = await API.mergeRecords({ surveyId, sourceRecordUuid, targetRecordUuid, preview: true })
-
-    dispatch({ type: ActionTypes.recordLoad, record, noHeader: true })
+    const { record, nodesCreated, nodesUpdated } = await API.mergeRecords({
+      surveyId,
+      sourceRecordUuid,
+      targetRecordUuid,
+      preview: true,
+    })
 
     dispatch(LoaderActions.hideLoader())
+
+    const onMergeConfirmed = () => dispatch({ type: ActionTypes.recordLoad, record, noHeader: true })
+
+    if (nodesUpdated + nodesCreated === 0) {
+      dispatch(NotificationActions.notifyWarning({ key: 'dataView.records.merge.noChangesWillBeApplied' }))
+    } else if (nodesUpdated > updatedNodesWarnLimit) {
+      dispatch(
+        DialogConfirmActions.showDialogConfirm({
+          key: 'dataView.records.merge.confirmTooManyDifferencesMessage',
+          params: { nodesUpdated },
+          onOk: onMergeConfirmed,
+        })
+      )
+    } else {
+      onMergeConfirmed()
+    }
   }
 
 export const mergeRecords =
diff --git a/yarn.lock b/yarn.lock
index 80e5c3f3f2..8d56f9e952 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5098,9 +5098,9 @@ caniuse-api@^3.0.0:
     lodash.uniq "^4.5.0"
 
 caniuse-lite@^1.0.0, caniuse-lite@^1.0.30001517, caniuse-lite@^1.0.30001587:
-  version "1.0.30001589"
-  resolved "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001589.tgz"
-  integrity sha512-vNQWS6kI+q6sBlHbh71IIeC+sRwK2N3EDySc/updIGhIee2x5z00J4c1242/5/d6EpEMdOnk/m+6tuk4/tcsqg==
+  version "1.0.30001653"
+  resolved "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001653.tgz"
+  integrity sha512-XGWQVB8wFQ2+9NZwZ10GxTYC5hk0Fa+q8cSkr0tgvMhYhMHP/QC+WTgrePMDBWiWc/pV+1ik82Al20XOK25Gcw==
 
 caniuse-lite@^1.0.30001646:
   version "1.0.30001653"