diff --git a/AxonIvyPortal/portal-selenium-test/resources/js/document-screenshot.js b/AxonIvyPortal/portal-selenium-test/resources/js/document-screenshot.js
index d6de1e6f34..19f9deb588 100644
--- a/AxonIvyPortal/portal-selenium-test/resources/js/document-screenshot.js
+++ b/AxonIvyPortal/portal-selenium-test/resources/js/document-screenshot.js
@@ -361,4 +361,8 @@ function createBlackThinOutline($element) {
 
 function createBlackMediumOutline($element) {
   $element.addClass("black-medium-outline");
+}
+
+function highlightCasePreviewDocument(){
+  createRedMediumOutline($("a[id$=':preview-file']"));
 }
\ No newline at end of file
diff --git a/AxonIvyPortal/portal-selenium-test/src_test/com/axonivy/portal/selenium/common/Variable.java b/AxonIvyPortal/portal-selenium-test/src_test/com/axonivy/portal/selenium/common/Variable.java
index 81ffd6fc1a..0326674235 100644
--- a/AxonIvyPortal/portal-selenium-test/src_test/com/axonivy/portal/selenium/common/Variable.java
+++ b/AxonIvyPortal/portal-selenium-test/src_test/com/axonivy/portal/selenium/common/Variable.java
@@ -35,7 +35,10 @@ public enum Variable {
   GLOBAL_FOOTER_INFO("Portal.GlobalFooterInfo"), USER_MENU("Portal.UserMenu"), DEFAULT_THEME_MODE("Portal.Theme.Mode"),
   GLOBAL_SEARCH_SCOPE_BY_CATEGORIES("Portal.GlobalSearchScopeCategories"),
   SHOW_QUICK_GLOBAL_SEARCH("Portal.ShowQuickGlobalSearch"),
-  ENABLE_SWITCH_THEME_BUTTON("Portal.Theme.EnableSwitchThemeModeButton"), DASHBOARD_MAIN_MENU_ENTRY("Portal.Dashboard.MainMenuEntry"), APPLICATION_NAME("Portal.ApplicationName");
+  ENABLE_SWITCH_THEME_BUTTON("Portal.Theme.EnableSwitchThemeModeButton"), 
+  DASHBOARD_MAIN_MENU_ENTRY("Portal.Dashboard.MainMenuEntry"), 
+  APPLICATION_NAME("Portal.ApplicationName"),
+  ENABLE_DOCUMENT_PREVIEW("Portal.Document.EnablePreview");
 
   private String key;
 
diff --git a/AxonIvyPortal/portal-selenium-test/src_test/com/axonivy/portal/selenium/document/screenshot/PortalCasesScreenshotTest.java b/AxonIvyPortal/portal-selenium-test/src_test/com/axonivy/portal/selenium/document/screenshot/PortalCasesScreenshotTest.java
index 8a6f125fe7..b59fed7b6e 100644
--- a/AxonIvyPortal/portal-selenium-test/src_test/com/axonivy/portal/selenium/document/screenshot/PortalCasesScreenshotTest.java
+++ b/AxonIvyPortal/portal-selenium-test/src_test/com/axonivy/portal/selenium/document/screenshot/PortalCasesScreenshotTest.java
@@ -226,4 +226,19 @@ public void screenshotProcessOverviewLink() throws IOException {
     ScreenshotUtils
         .captureHalfLeftPageScreenShot(ScreenshotUtils.PROCESSES_INFORMATION_WIDGET_FOLDER + "process-overview-link");
   }
+  
+  @Test
+  public void screenshotPreviewDocument() throws IOException{
+    updateGlobalVariable(Variable.ENABLE_DOCUMENT_PREVIEW.getKey(), "true");
+    CaseWidgetNewDashBoardPage caseWidget = mainMenuPage.openCaseList();
+    ScreenshotUtils.resizeBrowser(new Dimension(1600, SCREENSHOT_WIDTH));
+    WaitHelper.waitForNavigation(() -> caseWidget.openDetailsCase("Order Pizza"));
+    CaseDetailsPage detailsPage = new CaseDetailsPage();
+    detailsPage.uploadDocumentWithoutError(FileHelper.getAbsolutePathToTestFile("test-no-files-no-js.pdf"));
+    refreshPage();
+    detailsPage.waitForCaseDetailsDisplay();
+    ScreenshotUtils.executeDecorateJs("highlightCasePreviewDocument()");
+    ScreenshotUtils.captureElementWithMarginOptionScreenshot(detailsPage.getDocumentBox(),
+        ScreenshotUtils.CASE_DETAIL_FOLDER + "how-to-preview-document", new ScreenshotMargin(10));
+  }
 }
diff --git a/AxonIvyPortal/portal-selenium-test/src_test/com/axonivy/portal/selenium/page/CaseDetailsPage.java b/AxonIvyPortal/portal-selenium-test/src_test/com/axonivy/portal/selenium/page/CaseDetailsPage.java
index e069a25ee1..d60ddeccfd 100644
--- a/AxonIvyPortal/portal-selenium-test/src_test/com/axonivy/portal/selenium/page/CaseDetailsPage.java
+++ b/AxonIvyPortal/portal-selenium-test/src_test/com/axonivy/portal/selenium/page/CaseDetailsPage.java
@@ -1034,5 +1034,9 @@ public void clickShowCaseOwners() {
   public int countCaseOwners() {
     return $$("div[id$=':security-member-container']").size();
   }
+  
+  public boolean getFirstItemPreviewDocumentVisible() {
+    return $("a[id$=':0:preview-file']").exists();
+  }
 }
 
diff --git a/AxonIvyPortal/portal-selenium-test/src_test/com/axonivy/portal/selenium/test/UploadDocumentTest.java b/AxonIvyPortal/portal-selenium-test/src_test/com/axonivy/portal/selenium/test/UploadDocumentTest.java
index 536641b154..b4c5c1fbef 100644
--- a/AxonIvyPortal/portal-selenium-test/src_test/com/axonivy/portal/selenium/test/UploadDocumentTest.java
+++ b/AxonIvyPortal/portal-selenium-test/src_test/com/axonivy/portal/selenium/test/UploadDocumentTest.java
@@ -36,12 +36,14 @@ public void setup() {
 
   @Test
   public void uploadNormalDocument() {
+    updateGlobalVariable(Variable.ENABLE_DOCUMENT_PREVIEW.getKey(), "true");
     initNewDashboardPage(TestAccount.ADMIN_USER);
     casePage = menuPage.openCaseList();
     caseDetailsPage = casePage.openDetailsCase("Leave Request");
     int numberOfDocument = caseDetailsPage.countNumberOfDocument();
     caseDetailsPage.uploadDocumentWithoutError(FileHelper.getAbsolutePathToTestFile("test-no-files-no-js.pdf"));
     caseDetailsPage.checkNumberOfDocument(numberOfDocument + 1);
+    assertTrue(caseDetailsPage.getFirstItemPreviewDocumentVisible());
   }
 
   @Test
@@ -84,6 +86,7 @@ public void uploadUnsupportedFileType() {
 
   @Test
   public void uploadDocumentAndCheckDocumentName() {
+    updateGlobalVariable(Variable.ENABLE_DOCUMENT_PREVIEW.getKey(), "true");
     final String pdfFile = "test-no-files-no-js.pdf";
     final String wordFile = "test-ms-word-extension.doc";
     final String unsupportFile = "unsupportedExtension.abc";
@@ -94,16 +97,22 @@ public void uploadDocumentAndCheckDocumentName() {
     caseDetailsPage = casePage.openDetailsCase("Leave Request");
     caseDetailsPage.uploadDocumentWithoutError(FileHelper.getAbsolutePathToTestFile(pdfFile));
     isCorrectIconExtension(pdfFile, "si si-office-file-pdf-1");
+    // can preview this document
+    assertTrue(caseDetailsPage.getFirstItemPreviewDocumentVisible());
 
     casePage = menuPage.openCaseList();
     caseDetailsPage = casePage.openDetailsCase("Leave Request");
     caseDetailsPage.uploadDocumentWithoutError(FileHelper.getAbsolutePathToTestFile(wordFile));
     isCorrectIconExtension(wordFile, "si si-office-file-doc-1");
+    // can not preview
+    assertFalse(caseDetailsPage.getFirstItemPreviewDocumentVisible());
 
     casePage = menuPage.openCaseList();
     caseDetailsPage = casePage.openDetailsCase("Leave Request");
     caseDetailsPage.uploadDocumentWithoutError(FileHelper.getAbsolutePathToTestFile(unsupportFile));
     isCorrectIconExtension(unsupportFile, "si si-common-file-empty");
+    // can not preview
+    assertFalse(caseDetailsPage.getFirstItemPreviewDocumentVisible());
   }
 
   private boolean isCorrectIconExtension(String fileName, String iconClass) {
diff --git a/AxonIvyPortal/portal/cms/cms_de.yaml b/AxonIvyPortal/portal/cms/cms_de.yaml
index f7223acbf5..8dd85de889 100644
--- a/AxonIvyPortal/portal/cms/cms_de.yaml
+++ b/AxonIvyPortal/portal/cms/cms_de.yaml
@@ -202,6 +202,7 @@ ch.ivy.addon.portalkit.ui.jsf:
       ApplicationName: Der Standard-Anwendungsname, der im Seitentitel angezeigt wird.
       BaseQRCodeUrl: Legen Sie die Basis-URL für den anzuzeigenden QR-Code fest.
       DefaultThemeMode: Der Standardthemenmodus der Anwendung
+      EnableDocumentPreview: 'Auf "true" setzen, um die Vorschau von Dokumenten für bestimmte Dateitypen zu aktivieren. Unterstützte Dateitypen sind: pdf, png, jpeg, jpg, txt, log.'
       EnableSwitchThemeModeButton: Setzen Sie diesen Wert auf true, um die Schaltfläche "Thema wechseln" zu aktivieren.
       GlobalSearchScopeCategoriesNote: Festlegung der Typen, nach denen bei der globalen Suche gesucht werden soll
       GooglePlayURL: Legen Sie die URL fest, um die Axon Ivy-Mobilanwendung auf Google Play herunterzuladen.
@@ -878,6 +879,7 @@ ch.ivy.addon.portalkit.ui.jsf:
     yourProcesses: Ihre Prozesse
     yourTasks: Ihre Aufgaben
   documentFiles:
+    PreviewDocument: Vorschau
     deleteDocumentNote: '{0} hat folgendes gelöscht: {1}'
     deleteSuceed: Datei wurde erfolgreich gelöscht
     download: Herunterladen
diff --git a/AxonIvyPortal/portal/cms/cms_en.yaml b/AxonIvyPortal/portal/cms/cms_en.yaml
index 73c02a2e09..f1b3b2f579 100644
--- a/AxonIvyPortal/portal/cms/cms_en.yaml
+++ b/AxonIvyPortal/portal/cms/cms_en.yaml
@@ -202,6 +202,7 @@ ch.ivy.addon.portalkit.ui.jsf:
       ApplicationName: The default application name that will be displayed on the page title.
       BaseQRCodeUrl: Set Base URL for QR code to display.
       DefaultThemeMode: The default theme mode of the application
+      EnableDocumentPreview: 'Set to true to enable document preview for some certain file types. Supported file types are: pdf, png, txt, log.'
       EnableSwitchThemeModeButton: Set to true to enable the switch theme button.
       GlobalSearchScopeCategoriesNote: Defining the types that the global search will search for
       GooglePlayURL: Set URL to download Axon Ivy mobile app on Google Play.
@@ -880,6 +881,7 @@ ch.ivy.addon.portalkit.ui.jsf:
     yourProcesses: Your Processes
     yourTasks: Your Tasks
   documentFiles:
+    PreviewDocument: Preview
     deleteDocumentNote: '{0} has deleted {1}'
     deleteSuceed: File deleted successfully
     download: Download
diff --git a/AxonIvyPortal/portal/cms/cms_es.yaml b/AxonIvyPortal/portal/cms/cms_es.yaml
index cc0eeedb7d..f21872cbde 100644
--- a/AxonIvyPortal/portal/cms/cms_es.yaml
+++ b/AxonIvyPortal/portal/cms/cms_es.yaml
@@ -202,6 +202,7 @@ ch.ivy.addon.portalkit.ui.jsf:
       ApplicationName: El nombre por defecto de la aplicación que se mostrará en el título de la página.
       BaseQRCodeUrl: Establezca la URL base para mostrar el código QR.
       DefaultThemeMode: El modo de tema por defecto de la aplicación
+      EnableDocumentPreview: 'Establecer en "true" para habilitar la vista previa de documentos para ciertos tipos de archivos. Los tipos de archivos compatibles son: pdf, png, jpeg, jpg, txt, log.'
       EnableSwitchThemeModeButton: Establecer en true para habilitar el botón de cambio de tema.
       GlobalSearchScopeCategoriesNote: Definición de los tipos que buscará la búsqueda global
       GooglePlayURL: Establece la URL para descargar la aplicación móvil Axon Ivy en Google Play.
@@ -877,6 +878,7 @@ ch.ivy.addon.portalkit.ui.jsf:
     yourProcesses: Sus procesos
     yourTasks: Sus tareas
   documentFiles:
+    PreviewDocument: Vista previa
     deleteDocumentNote: '{0} ha eliminado {1}'
     deleteSuceed: Archivo eliminado con éxito
     download: Descargar
diff --git a/AxonIvyPortal/portal/cms/cms_fr.yaml b/AxonIvyPortal/portal/cms/cms_fr.yaml
index c343a2a9a7..b0170a7b82 100644
--- a/AxonIvyPortal/portal/cms/cms_fr.yaml
+++ b/AxonIvyPortal/portal/cms/cms_fr.yaml
@@ -202,6 +202,7 @@ ch.ivy.addon.portalkit.ui.jsf:
       ApplicationName: Le nom de l'application par défaut qui sera affiché dans le titre de la page.
       BaseQRCodeUrl: Définir l'URL de base du code QR à afficher.
       DefaultThemeMode: Le mode de thème par défaut de l'application
+      EnableDocumentPreview: 'Définir sur "true" pour activer l''aperçu des documents pour certains types de fichiers. Les types de fichiers pris en charge sont : pdf, png, jpeg, jpg, txt, log.'
       EnableSwitchThemeModeButton: Défini à true pour activer le bouton de changement de thème.
       GlobalSearchScopeCategoriesNote: Définition des types recherchés par la recherche globale
       GooglePlayURL: Définir l'URL pour télécharger l'application mobile Axon Ivy sur Google Play.
@@ -875,6 +876,7 @@ ch.ivy.addon.portalkit.ui.jsf:
     yourProcesses: Vos processus
     yourTasks: Vos tâches
   documentFiles:
+    PreviewDocument: Aperçu
     deleteDocumentNote: '{0} a supprimé(e) {1}'
     deleteSuceed: Le fichier a été supprimé avec succès
     download: Télécharger
diff --git a/AxonIvyPortal/portal/config/variables.yaml b/AxonIvyPortal/portal/config/variables.yaml
index c7242e6ff9..a039b3d3ae 100644
--- a/AxonIvyPortal/portal/config/variables.yaml
+++ b/AxonIvyPortal/portal/config/variables.yaml
@@ -179,6 +179,9 @@ Variables:
       # If just allow some extensions, list out extensions here, separated by comma. Example: pdf, txt, doc, docx.
       WhitelistExtension: doc, docx, xls, xlsx, xlsm, csv, pdf, ppt, pptx, txt, zip, jpg, jpeg, bmp, png
 
+      # Set to true to enable document preview for some certain file types. Supported file types are: pdf, png, txt, log.
+      EnablePreview: false
+      
     DateTimeFormat:
       # Set to true to hide hours and minutes next to date in the datetime format.
       # This setting affects in Tasks, Cases and Statistic results.
diff --git a/AxonIvyPortal/portal/src/ch/ivy/addon/portalkit/bean/CaseTaskDocumentBean.java b/AxonIvyPortal/portal/src/ch/ivy/addon/portalkit/bean/CaseTaskDocumentBean.java
index 4d83493001..7b826ae252 100644
--- a/AxonIvyPortal/portal/src/ch/ivy/addon/portalkit/bean/CaseTaskDocumentBean.java
+++ b/AxonIvyPortal/portal/src/ch/ivy/addon/portalkit/bean/CaseTaskDocumentBean.java
@@ -6,8 +6,11 @@
 
 import javax.faces.bean.ManagedBean;
 
+import org.apache.commons.lang3.StringUtils;
 import org.primefaces.model.SortMeta;
 
+import com.axonivy.portal.components.ivydata.bo.IvyDocument;
+
 import ch.ivy.addon.portal.generic.navigation.PortalNavigator;
 import ch.ivy.addon.portalkit.enums.GlobalVariable;
 import ch.ivy.addon.portalkit.service.GlobalSettingService;
@@ -80,4 +83,13 @@ public String getCaseDocumentsLink(ICase iCase) {
   public SortMeta getDocumentSortByCreationTimestamp() {
     return SortFieldUtil.buildSortMeta("creation.timestamp", true);
   }
+  
+  public boolean canPreviewDocument(IvyDocument document) {
+    boolean enablePreviewSetting = GlobalSettingService.getInstance().findBooleanGlobalSettingValue(GlobalVariable.ENABLE_DOCUMENT_PREVIEW);
+    if (document != null && StringUtils.startsWithIgnoreCase(document.getContentType(), "image/")) {
+      return enablePreviewSetting;
+    }
+    boolean isSupportedPreviewType = document != null && StringUtils.endsWithAny(document.getPath().toLowerCase(), ".pdf", ".txt", ".log");
+    return enablePreviewSetting && isSupportedPreviewType;
+  }
 }
diff --git a/AxonIvyPortal/portal/src/ch/ivy/addon/portalkit/enums/GlobalVariable.java b/AxonIvyPortal/portal/src/ch/ivy/addon/portalkit/enums/GlobalVariable.java
index 421a6216db..0c528648f2 100644
--- a/AxonIvyPortal/portal/src/ch/ivy/addon/portalkit/enums/GlobalVariable.java
+++ b/AxonIvyPortal/portal/src/ch/ivy/addon/portalkit/enums/GlobalVariable.java
@@ -81,7 +81,8 @@ public enum GlobalVariable {
       "appleStoreURL"), GOOGLE_PLAY_URL("Portal.UserMenu.GooglePlayURL", GlobalVariableType.TEXT,
           "googlePlayURL"),
   APPLICATION_NAME("Portal.ApplicationName", GlobalVariableType.TEXT, "Axon Ivy", "ApplicationName"), HIDE_CASE_CREATOR(
-      "Portal.Cases.HideCaseCreator", GlobalVariableType.SELECTION, Option.FALSE.toString(), "hideCaseCreator");
+      "Portal.Cases.HideCaseCreator", GlobalVariableType.SELECTION, Option.FALSE.toString(), "hideCaseCreator"),
+  ENABLE_DOCUMENT_PREVIEW("Portal.Document.EnablePreview", GlobalVariableType.SELECTION, Option.TRUE.toString(), "enableDocumentPreview");
 
 
 
diff --git a/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portal/generic/TaskDocuments/TaskDocuments.xhtml b/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portal/generic/TaskDocuments/TaskDocuments.xhtml
index b4c4e1da39..f3d47ad96e 100644
--- a/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portal/generic/TaskDocuments/TaskDocuments.xhtml
+++ b/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portal/generic/TaskDocuments/TaskDocuments.xhtml
@@ -45,7 +45,7 @@
               styleClass="u-truncate-text ui-sm-12" width="65%"
               filterBy="#{document.name}" filterMatchMode="contains">
               <h:panelGroup layout="block" rendered="#{document ne null}" styleClass="task-document-name">
-                <p:commandLink ajax="false" id="download" styleClass="download-command task-document-name-text u-truncate-text" ariaLabel="#{ivy.cms.co('/ch.ivy.addon.portalkit.ui.jsf/documentFiles/download')}">
+                <p:commandLink ajax="false" id="download" styleClass="task-document-name-text u-truncate-text" ariaLabel="#{ivy.cms.co('/ch.ivy.addon.portalkit.ui.jsf/documentFiles/download')}">
                   <p:fileDownload value="#{logic.downloadDocument(document)}"/>
                   <ic:ch.ivy.addon.portalkit.component.document.DocumentNameWithIcon fileName="#{document.name}"
                     fileSize="#{masterDataBean.getReadableFileSize(document.size)}"
diff --git a/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/CaseItemDocument/CaseItemDocument.xhtml b/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/CaseItemDocument/CaseItemDocument.xhtml
index 3d073e9686..fe01a572ef 100644
--- a/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/CaseItemDocument/CaseItemDocument.xhtml
+++ b/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/CaseItemDocument/CaseItemDocument.xhtml
@@ -56,13 +56,22 @@
             styleClass="u-truncate-text document-name">
             <h:panelGroup layout="block" rendered="#{document ne null}" styleClass="case-document-name">
               <p:commandLink ajax="false" id="download" ariaLabel="#{ivy.cms.co('/ch.ivy.addon.portalkit.ui.jsf/documentFiles/download')}"
-                styleClass="download-command case-document-name-text u-truncate-text">
+                styleClass="case-document-name-text u-truncate-text">
                 <p:fileDownload value="#{logic.downloadDocument(document)}" />
                 <ic:ch.ivy.addon.portalkit.component.document.DocumentNameWithIcon fileName="#{document.name}" fileSize="#{masterDataBean.getReadableFileSize(document.size)}"
                   symbolStyleClass="case-details-document-download-icon" 
                   fileNameStyleClass="js-document-name document-name"
                   fileSizeStyleClass="document-size" />
               </p:commandLink>
+              <p:commandLink id="preview-file" ariaLabel="#{ivy.cms.co('/ch.ivy.addon.portalkit.ui.jsf/documentFiles/PreviewDocument')}" 
+                styleClass="si si-view-1 Fright document-preview ui-sm-hidden"
+                actionListener="#{logic.downloadDocument(document)}"
+                rendered="#{caseTaskDocumentBean.canPreviewDocument(document)}"
+                update="#{cc.clientId}:preview-document-dialog"
+                oncomplete="PF('preview-document-dialog').show()">
+                <p:tooltip for="preview-file" trackMouse="true" hideEvent="mouseleave click"
+                  value="#{ivy.cms.co('/ch.ivy.addon.portalkit.ui.jsf/documentFiles/PreviewDocument')}" />
+              </p:commandLink>
               <p:commandLink id="delete-file" actionListener="#{data.setDocument(document)}"
                 ariaLabel="#{ivy.cms.co('/ch.ivy.addon.portalkit.ui.jsf/caseDetails/deleteFile')} #{document.name}"
                 rendered="#{caseTaskDocumentBean.canWriteDocument(case)}"
@@ -157,6 +166,16 @@
         update="#{cc.clientId}:document-upload-form:upload-messages @this" />
     </div>
   </p:dialog>
+  
+  <p:dialog widgetVar="preview-document-dialog" id="preview-document-dialog" appendTo="@(body)" 
+      header="#{ivy.cms.co('/ch.ivy.addon.portalkit.ui.jsf/documentFiles/PreviewDocument')}" 
+      modal="true" resizable="false" width="650" height="630" showEffect="fade" hideEffect="fade" 
+      styleClass="case-upload-dialog" dynamic="true" fitViewport="true" responsive="true">
+    <div class="ui-g-12">
+      <p:media value="#{data.streamedContent}" width="100%" height="600" cache="false" id="media-content" player="pdf" rendered="#{!data.isImage}"/>
+      <p:graphicImage value="#{data.streamedContent}" stream="false" height="600" width="100%" rendered="#{data.isImage}" styleClass="document-preview-image"/>
+    </div>
+  </p:dialog>
 
   <ui:decorate template="/layouts/decorator/portal-dialog-with-icon.xhtml">
     <ui:param name="widgetVar" value="document-deletion-dialog" />
diff --git a/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/CaseItemDocument/CaseItemDocumentData.d.json b/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/CaseItemDocument/CaseItemDocumentData.d.json
index 8acef9945b..c675038803 100644
--- a/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/CaseItemDocument/CaseItemDocumentData.d.json
+++ b/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/CaseItemDocument/CaseItemDocumentData.d.json
@@ -37,5 +37,9 @@
     "name" : "deleteDocumentMessage",
     "type" : "String",
     "modifiers" : [ "PERSISTENT" ]
+  }, {
+    "name" : "isImage",
+    "type" : "Boolean",
+    "modifiers" : [ "PERSISTENT" ]
   } ]
 }
\ No newline at end of file
diff --git a/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/CaseItemDocument/CaseItemDocumentProcess.p.json b/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/CaseItemDocument/CaseItemDocumentProcess.p.json
index 90dc2f4606..264a1e72e9 100644
--- a/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/CaseItemDocument/CaseItemDocumentProcess.p.json
+++ b/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/CaseItemDocument/CaseItemDocumentProcess.p.json
@@ -116,7 +116,11 @@
           ],
           "map" : {
             "out.document" : "param.document"
-          }
+          },
+          "code" : [
+            "import org.apache.commons.lang3.StringUtils;",
+            "out.isImage = param.document!= null && StringUtils.startsWithIgnoreCase(param.document.getContentType(), \"image/\");"
+          ]
         },
         "result" : {
           "params" : [
diff --git a/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/TaskItemDocuments/TaskItemDocuments.xhtml b/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/TaskItemDocuments/TaskItemDocuments.xhtml
index 724ab83c41..cc8172d6f7 100644
--- a/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/TaskItemDocuments/TaskItemDocuments.xhtml
+++ b/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/TaskItemDocuments/TaskItemDocuments.xhtml
@@ -55,13 +55,22 @@
             sortBy="#{document.name}"
             styleClass="">
             <h:panelGroup layout="block" rendered="#{document ne null}" styleClass="task-document-name">
-              <p:commandLink ajax="false" id="download" styleClass="download-command task-document-name-text u-truncate-text" ariaLabel="#{ivy.cms.co('/ch.ivy.addon.portalkit.ui.jsf/documentFiles/download')}">
+              <p:commandLink ajax="false" id="download" styleClass="task-document-name-text u-truncate-text" ariaLabel="#{ivy.cms.co('/ch.ivy.addon.portalkit.ui.jsf/documentFiles/download')}">
                 <p:fileDownload value="#{logic.downloadDocument(document)}" />
                 <ic:ch.ivy.addon.portalkit.component.document.DocumentNameWithIcon fileName="#{document.name}" fileSize="#{masterDataBean.getReadableFileSize(document.size)}"
                   symbolStyleClass="task-details-document-download-icon"
                   fileNameStyleClass="document-name"
                   fileSizeStyleClass="document-size" />
               </p:commandLink>
+              <p:commandLink id="preview-file" ariaLabel="#{ivy.cms.co('/ch.ivy.addon.portalkit.ui.jsf/documentFiles/PreviewDocument')}" 
+                styleClass="si si-view-1 Fright document-preview ui-sm-hidden"
+                actionListener="#{logic.downloadDocument(document)}"
+                rendered="#{caseTaskDocumentBean.canPreviewDocument(document)}"
+                update="#{cc.clientId}:preview-document-dialog"
+                oncomplete="PF('preview-document-dialog').show()">
+                <p:tooltip for="preview-file" trackMouse="true" hideEvent="mouseleave click"
+                  value="#{ivy.cms.co('/ch.ivy.addon.portalkit.ui.jsf/documentFiles/PreviewDocument')}" />
+              </p:commandLink>
               <p:commandLink id="delete-file" actionListener="#{data.setDocument(document)}" ariaLabel="#{ivy.cms.co('/ch.ivy.addon.portalkit.ui.jsf/taskDetails/deleteFile')} #{document.name}"
                 rendered="#{caseTaskDocumentBean.canWriteDocument(task)}"
                 styleClass="si si-remove Fright task-document-download" oncomplete="PF('document-deletion-dialog').show()">
@@ -155,7 +164,16 @@
         update="#{p:resolveFirstComponentWithId('upload-messages', view).clientId} @this" />
     </div>
   </p:dialog>
-
+  
+  <p:dialog widgetVar="preview-document-dialog" id="preview-document-dialog" appendTo="@(body)" 
+      header="#{ivy.cms.co('/ch.ivy.addon.portalkit.ui.jsf/documentFiles/PreviewDocument')}" 
+      modal="true" resizable="false" width="650" height="630" showEffect="fade" hideEffect="fade" 
+      styleClass="case-upload-dialog" dynamic="true" fitViewport="true" responsive="true">
+    <div class="ui-g-12">
+      <p:media value="#{data.streamedContent}" width="100%" height="600" cache="false" id="media-content" player="pdf" rendered="#{!data.isImage}"/>
+      <p:graphicImage value="#{data.streamedContent}" stream="false" height="600" width="100%" rendered="#{data.isImage}" styleClass="document-preview-image"/>
+    </div>
+  </p:dialog>
   <ui:decorate template="/layouts/decorator/portal-dialog-with-icon.xhtml">
     <ui:param name="id" value="document-deletion-dialog" />
     <ui:param name="widgetVar" value="document-deletion-dialog" />
diff --git a/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/TaskItemDocuments/TaskItemDocumentsData.d.json b/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/TaskItemDocuments/TaskItemDocumentsData.d.json
index e5f0cc7786..630c2a7e6d 100644
--- a/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/TaskItemDocuments/TaskItemDocumentsData.d.json
+++ b/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portalkit/component/TaskItemDocuments/TaskItemDocumentsData.d.json
@@ -47,5 +47,9 @@
     "name" : "deleteDocumentMessage",
     "type" : "String",
     "modifiers" : [ "PERSISTENT" ]
+  }, {
+    "name" : "isImage",
+    "type" : "Boolean",
+    "modifiers" : [ "PERSISTENT" ]
   } ]
 }
\ No newline at end of file
diff --git a/AxonIvyPortal/portal/webContent/resources/css/module.css b/AxonIvyPortal/portal/webContent/resources/css/module.css
index 62b286ae00..dccf8910a3 100644
--- a/AxonIvyPortal/portal/webContent/resources/css/module.css
+++ b/AxonIvyPortal/portal/webContent/resources/css/module.css
@@ -424,6 +424,14 @@ span.case-details-document-add-link, span.task-details-document-add-link {
   top: 2px;
   right: 4px;
 }
+.document-preview{
+  position:absolute;
+  top:2px;
+  right:30px;
+}
+.document-preview-image{
+  object-fit:contain;
+}
 /********************************** CASE ITEM SIMILAR TO TASK ITEM CLASSES **********************************/
 .case-widget-container .case-widget-top-header {
   position: relative;