diff --git a/app/docker/helpers/containerHelper.js b/app/docker/helpers/containerHelper.js
index 6daf5d4e7..c50a9183e 100644
--- a/app/docker/helpers/containerHelper.js
+++ b/app/docker/helpers/containerHelper.js
@@ -259,6 +259,10 @@ angular.module('portainer.docker').factory('ContainerHelper', [
       return bindings;
     };
 
+    helper.getContainerNames = function (containers) {
+      return _.map(_.flatten(_.map(containers, 'Names')), (name) => _.trimStart(name, '/'));
+    };
+
     return helper;
   },
 ]);
diff --git a/app/portainer/components/stack-duplication-form/stack-duplication-form-controller.js b/app/portainer/components/stack-duplication-form/stack-duplication-form-controller.js
index c2bc89cb6..b0e7b5ff4 100644
--- a/app/portainer/components/stack-duplication-form/stack-duplication-form-controller.js
+++ b/app/portainer/components/stack-duplication-form/stack-duplication-form-controller.js
@@ -24,7 +24,7 @@ angular.module('portainer.app').controller('StackDuplicationFormController', [
     }
 
     function isFormValidForDuplication() {
-      return isFormValidForMigration() && ctrl.formValues.newName;
+      return isFormValidForMigration() && ctrl.formValues.newName && !ctrl.yamlError;
     }
 
     function duplicateStack() {
diff --git a/app/portainer/components/stack-duplication-form/stack-duplication-form.html b/app/portainer/components/stack-duplication-form/stack-duplication-form.html
index 5e7cf743f..cf2e0a293 100644
--- a/app/portainer/components/stack-duplication-form/stack-duplication-form.html
+++ b/app/portainer/components/stack-duplication-form/stack-duplication-form.html
@@ -33,6 +33,9 @@
         <span ng-hide="$ctrl.state.duplicationInProgress"> <i class="fa fa-clone space-right" aria-hidden="true"></i> Duplicate </span>
         <span ng-show="$ctrl.state.duplicationInProgress">Duplication in progress...</span>
       </button>
+      <div ng-if="$ctrl.yamlError"
+        ><span class="text-danger small">{{ $ctrl.yamlError }}</span></div
+      >
     </div>
   </div>
 </div>
diff --git a/app/portainer/components/stack-duplication-form/stack-duplication-form.js b/app/portainer/components/stack-duplication-form/stack-duplication-form.js
index 36e45996f..c9460611d 100644
--- a/app/portainer/components/stack-duplication-form/stack-duplication-form.js
+++ b/app/portainer/components/stack-duplication-form/stack-duplication-form.js
@@ -7,5 +7,6 @@ angular.module('portainer.app').component('stackDuplicationForm', {
     endpoints: '<',
     groups: '<',
     currentEndpointId: '<',
+    yamlError: '<',
   },
 });
diff --git a/app/portainer/helpers/genericHelper.js b/app/portainer/helpers/genericHelper.js
new file mode 100644
index 000000000..47f115890
--- /dev/null
+++ b/app/portainer/helpers/genericHelper.js
@@ -0,0 +1,15 @@
+import _ from 'lodash-es';
+
+class GenericHelper {
+  static findDeepAll(obj, target, res = []) {
+    if (typeof obj === 'object') {
+      _.forEach(obj, (child, key) => {
+        if (key === target) res.push(child);
+        if (typeof child === 'object') GenericHelper.findDeepAll(child, target, res);
+      });
+    }
+    return res;
+  }
+}
+
+export default GenericHelper;
diff --git a/app/portainer/helpers/stackHelper.js b/app/portainer/helpers/stackHelper.js
index 77d43949b..bfaf24b9f 100644
--- a/app/portainer/helpers/stackHelper.js
+++ b/app/portainer/helpers/stackHelper.js
@@ -1,5 +1,6 @@
 import _ from 'lodash-es';
-
+import YAML from 'yaml';
+import GenericHelper from '@/portainer/helpers/genericHelper';
 import { ExternalStackViewModel } from '@/portainer/models/stack';
 
 angular.module('portainer.app').factory('StackHelper', [
@@ -22,6 +23,28 @@ angular.module('portainer.app').factory('StackHelper', [
       );
     }
 
+    helper.validateYAML = function (yaml, containerNames) {
+      let yamlObject;
+
+      try {
+        yamlObject = YAML.parse(yaml);
+      } catch (err) {
+        return 'There is an error in the yaml syntax: ' + err;
+      }
+
+      const names = _.uniq(GenericHelper.findDeepAll(yamlObject, 'container_name'));
+      const duplicateContainers = _.intersection(containerNames, names);
+
+      if (duplicateContainers.length === 0) return;
+
+      return (
+        (duplicateContainers.length === 1 ? 'This container name is' : 'These container names are') +
+        ' already used by another container running in this environment: ' +
+        _.join(duplicateContainers, ', ') +
+        '.'
+      );
+    };
+
     return helper;
   },
 ]);
diff --git a/app/portainer/views/stacks/create/createStackController.js b/app/portainer/views/stacks/create/createStackController.js
index 7d226fccb..119f8d2a7 100644
--- a/app/portainer/views/stacks/create/createStackController.js
+++ b/app/portainer/views/stacks/create/createStackController.js
@@ -8,14 +8,18 @@ angular
   .controller('CreateStackController', function (
     $scope,
     $state,
+    $async,
     StackService,
     Authentication,
     Notifications,
     FormValidator,
     ResourceControlService,
     FormHelper,
+    EndpointProvider,
+    StackHelper,
+    ContainerHelper,
     CustomTemplateService,
-    EndpointProvider
+    ContainerService
   ) {
     $scope.formValues = {
       Name: '',
@@ -36,6 +40,8 @@ angular
       formValidationError: '',
       actionInProgress: false,
       StackType: null,
+      editorYamlValidationError: '',
+      uploadYamlValidationError: '',
     };
 
     $scope.addEnvironmentVariable = function () {
@@ -154,6 +160,26 @@ angular
 
     $scope.editorUpdate = function (cm) {
       $scope.formValues.StackFileContent = cm.getValue();
+      $scope.state.editorYamlValidationError = StackHelper.validateYAML($scope.formValues.StackFileContent, $scope.containerNames);
+    };
+
+    async function onFileLoadAsync(event) {
+      $scope.state.uploadYamlValidationError = StackHelper.validateYAML(event.target.result, $scope.containerNames);
+    }
+
+    function onFileLoad(event) {
+      return $async(onFileLoadAsync, event);
+    }
+
+    $scope.uploadFile = function (file) {
+      $scope.formValues.StackFile = file;
+
+      if (file) {
+        const temporaryFileReader = new FileReader();
+        temporaryFileReader.fileName = file.name;
+        temporaryFileReader.onload = onFileLoad;
+        temporaryFileReader.readAsText(file);
+      }
     };
 
     $scope.onChangeTemplate = async function onChangeTemplate(template) {
@@ -186,6 +212,13 @@ angular
       } catch (err) {
         Notifications.error('Failure', err, 'Unable to retrieve the ComposeSyntaxMaxVersion');
       }
+
+      try {
+        $scope.containers = await ContainerService.containers();
+        $scope.containerNames = ContainerHelper.getContainerNames($scope.containers);
+      } catch (err) {
+        Notifications.error('Failure', err, 'Unable to retrieve Containers');
+      }
     }
 
     initView();
diff --git a/app/portainer/views/stacks/create/createstack.html b/app/portainer/views/stacks/create/createstack.html
index 10f57d321..6719edfec 100644
--- a/app/portainer/views/stacks/create/createstack.html
+++ b/app/portainer/views/stacks/create/createstack.html
@@ -90,6 +90,9 @@
               <span class="col-sm-12 text-muted small">
                 You can get more information about Compose file format in the <a href="https://docs.docker.com/compose/compose-file/" target="_blank">official documentation</a>.
               </span>
+              <div class="col-sm-12" ng-if="state.editorYamlValidationError"
+                ><span class="text-danger small">{{ state.editorYamlValidationError }}</span></div
+              >
             </div>
             <div class="form-group">
               <div class="col-sm-12">
@@ -112,10 +115,13 @@
               <span class="col-sm-12 text-muted small">
                 You can upload a Compose file from your computer.
               </span>
+              <div class="col-sm-12" ng-if="state.uploadYamlValidationError"
+                ><span class="text-danger small">{{ state.uploadYamlValidationError }}</span></div
+              >
             </div>
             <div class="form-group">
               <div class="col-sm-12">
-                <button type="button" class="btn btn-sm btn-primary" ngf-select ng-model="formValues.StackFile">Select file</button>
+                <button type="button" class="btn btn-sm btn-primary" ngf-select="uploadFile($file)">Select file</button>
                 <span style="margin-left: 5px;">
                   {{ formValues.StackFile.name }}
                   <i class="fa fa-times red-icon" ng-if="!formValues.StackFile" aria-hidden="true"></i>
@@ -235,6 +241,11 @@
               <div class="col-sm-12 form-section-title">
                 Web editor
               </div>
+              <div class="form-group">
+                <div class="col-sm-12" ng-if="state.editorYamlValidationError"
+                  ><span class="text-danger small">{{ state.editorYamlValidationError }}</span></div
+                >
+              </div>
               <div class="form-group">
                 <div class="col-sm-12">
                   <code-editor
@@ -292,9 +303,9 @@
                 type="button"
                 class="btn btn-primary btn-sm"
                 ng-disabled="state.actionInProgress
-              || (state.Method === 'editor' && !formValues.StackFileContent)
-              || (state.Method === 'upload' && !formValues.StackFile)
-              || (state.Method === 'template' && (!formValues.StackFileContent || !selectedTemplate))
+              || (state.Method === 'editor' && (!formValues.StackFileContent || state.editorYamlValidationError))
+              || (state.Method === 'upload' && (!formValues.StackFile || state.uploadYamlValidationError))
+              || (state.Method === 'template' && (!formValues.StackFileContent || !selectedTemplate || state.editorYamlValidationError))
               || (state.Method === 'repository' && ((!formValues.RepositoryURL || !formValues.ComposeFilePathInRepository) || (formValues.RepositoryAuthentication && (!formValues.RepositoryUsername || !formValues.RepositoryPassword))))
               || !formValues.Name"
                 ng-click="deployStack()"
diff --git a/app/portainer/views/stacks/edit/stack.html b/app/portainer/views/stacks/edit/stack.html
index 27d86e026..da43c701c 100644
--- a/app/portainer/views/stacks/edit/stack.html
+++ b/app/portainer/views/stacks/edit/stack.html
@@ -84,6 +84,7 @@
                 current-endpoint-id="currentEndpointId"
                 on-duplicate="duplicateStack(name, endpointId)"
                 on-migrate="migrateStack(name, endpointId)"
+                yaml-error="state.yamlError"
               >
               </stack-duplication-form>
             </div>
diff --git a/app/portainer/views/stacks/edit/stackController.js b/app/portainer/views/stacks/edit/stackController.js
index c7e01dc15..fdc20c67d 100644
--- a/app/portainer/views/stacks/edit/stackController.js
+++ b/app/portainer/views/stacks/edit/stackController.js
@@ -17,6 +17,7 @@ angular.module('portainer.app').controller('StackController', [
   'EndpointService',
   'GroupService',
   'ModalService',
+  'StackHelper',
   function (
     $async,
     $q,
@@ -35,13 +36,16 @@ angular.module('portainer.app').controller('StackController', [
     EndpointProvider,
     EndpointService,
     GroupService,
-    ModalService
+    ModalService,
+    StackHelper,
+    ContainerHelper
   ) {
     $scope.state = {
       actionInProgress: false,
       migrationInProgress: false,
       externalStack: false,
       showEditorTab: false,
+      yamlError: false,
     };
 
     $scope.formValues = {
@@ -187,6 +191,7 @@ angular.module('portainer.app').controller('StackController', [
 
     $scope.editorUpdate = function (cm) {
       $scope.stackFileContent = cm.getValue();
+      $scope.state.yamlError = StackHelper.validateYAML($scope.stackFileContent, $scope.containerNames);
     };
 
     $scope.stopStack = stopStack;
@@ -243,11 +248,14 @@ angular.module('portainer.app').controller('StackController', [
       $q.all({
         stack: StackService.stack(id),
         groups: GroupService.groups(),
+        containers: ContainerService.containers(),
       })
         .then(function success(data) {
           var stack = data.stack;
           $scope.groups = data.groups;
           $scope.stack = stack;
+          $scope.containers = data.containers;
+          $scope.containerNames = ContainerHelper.getContainerNames($scope.containers);
 
           let resourcesPromise = Promise.resolve({});
           if (stack.Status === 1) {
@@ -268,6 +276,8 @@ angular.module('portainer.app').controller('StackController', [
               assignComposeStackResources(data.resources);
             }
           }
+
+          $scope.state.yamlError = StackHelper.validateYAML($scope.stackFileContent, $scope.containerNames);
         })
         .catch(function error(err) {
           Notifications.error('Failure', err, 'Unable to retrieve stack details');