diff --git a/examples/FileUpload/FileUpload.ino b/examples/FileUpload/FileUpload.ino
index 53f3a6f..e44d0dd 100644
--- a/examples/FileUpload/FileUpload.ino
+++ b/examples/FileUpload/FileUpload.ino
@@ -73,12 +73,13 @@ static const char PAGE_BROWSE[] PROGMEM = R"(
     },
     {
       "name": "size",
-      "type": "ACText"
+      "type": "ACText",
+      "format": "%s bytes uploaded"
     },
     {
       "name": "content_type",
       "type": "ACText",
-      "value": "Content: "
+      "format": "Content: %s"
     }
   ]
 }
@@ -108,7 +109,7 @@ String postUpload(AutoConnectAux& aux, PageArgument& args) {
   String  content;
   String  filename = auxUpload.getElement<AutoConnectFile>("filename").value;
   aux.getElement<AutoConnectText>("filename").value = filename;
-  aux.getElement<AutoConnectText>("size").value = String(auxUpload.getElement<AutoConnectFile>("filename").size) + String("bytes uploaded");
+  aux.getElement<AutoConnectText>("size").value = String(auxUpload.getElement<AutoConnectFile>("filename").size);
   String contentType = auxUpload.getElement<AutoConnectFile>("filename").mimeType;
   aux.getElement<AutoConnectText>("content_type").value = contentType;
   if (contentType.indexOf("text/") >= 0) {
diff --git a/src/AutoConnectElementBasis.h b/src/AutoConnectElementBasis.h
index dd7fb7c..a718b7e 100644
--- a/src/AutoConnectElementBasis.h
+++ b/src/AutoConnectElementBasis.h
@@ -233,18 +233,20 @@ class AutoConnectSubmitBasis : virtual public AutoConnectElementBasis {
  * @param  name     Text name string.
  * @param  value    Text value string.
  * @param  style    A string of style-code for decoration, optionally.
+ * @param  format   C string that contains the value to be formatted.
  * An arrangement text would be placed with <div> contains. A string
  * of style-codes are given for '<div style=>'.
  */
 class AutoConnectTextBasis : virtual public AutoConnectElementBasis {
  public:
-  explicit AutoConnectTextBasis(const char* name = "", const char* value = "", const char* style = "") : AutoConnectElementBasis(name, value), style(String(style)) {
+  explicit AutoConnectTextBasis(const char* name = "", const char* value = "", const char* style = "", const char* format = "") : AutoConnectElementBasis(name, value), style(String(style)), format(String(format)) {
     _type = AC_Text;
   }
   virtual ~AutoConnectTextBasis() {}
   const String  toHTML(void) const override;
 
   String  style;      /**< CSS style modifier native code */
+  String  format;     /**< C string that contains the text to be written */
 };
 
 #endif // _AUTOCONNECTELEMENTBASIS_H_
diff --git a/src/AutoConnectElementBasisImpl.h b/src/AutoConnectElementBasisImpl.h
index e6f6fa1..8437da0 100644
--- a/src/AutoConnectElementBasisImpl.h
+++ b/src/AutoConnectElementBasisImpl.h
@@ -10,12 +10,14 @@
 #ifndef _AUTOCONNECTELEMENTBASISIMPL_H_
 #define _AUTOCONNECTELEMENTBASISIMPL_H_
 
-#include "AutoConnectElementBasis.h"
+#include <stdlib.h>
+#include <stdio.h>
 #if defined(ARDUINO_ARCH_ESP8266)
 #include <regex.h>
 #elif defined(ARDUINO_ARCH_ESP32)
 #include <regex>
 #endif
+#include "AutoConnectElementBasis.h"
 
 /**
  * Generate an HTML <button> element. The onclick behavior depends on
@@ -251,10 +253,21 @@ const String AutoConnectSubmitBasis::toHTML(void) const {
  */
 const String AutoConnectTextBasis::toHTML(void) const {
   String  html = String("<div");
+  String  value_f = value;
 
   if (style.length())
     html += String(F(" style=\"")) + style + String("\"");
-  html += String(">") + value + String(F("</div>"));
+  html += String(">");
+  if (format.length()) {
+    int   buflen = (value.length() + format.length() + 16 + 1) & (~0xf);
+    char* buffer;
+    if ((buffer = (char*)malloc(buflen))) {
+      snprintf(buffer, buflen, format.c_str(), value.c_str());
+      value_f = String(buffer);
+      free(buffer);
+    }
+  }
+  html += value_f + String(F("</div>"));
   return html;
 }
 
diff --git a/src/AutoConnectElementJson.h b/src/AutoConnectElementJson.h
index 88b0720..bffb427 100644
--- a/src/AutoConnectElementJson.h
+++ b/src/AutoConnectElementJson.h
@@ -17,6 +17,7 @@
 #define AUTOCONNECT_JSON_KEY_ARRANGE      "arrange"
 #define AUTOCONNECT_JSON_KEY_CHECKED      "checked"
 #define AUTOCONNECT_JSON_KEY_ELEMENT      "element"
+#define AUTOCONNECT_JSON_KEY_FORMAT       "format"
 #define AUTOCONNECT_JSON_KEY_LABEL        "label"
 #define AUTOCONNECT_JSON_KEY_MENU         "menu"
 #define AUTOCONNECT_JSON_KEY_NAME         "name"
@@ -234,10 +235,11 @@ class AutoConnectSubmitJson : public AutoConnectElementJson, public AutoConnectS
  */
 class AutoConnectTextJson : public AutoConnectElementJson, public AutoConnectTextBasis {
  public:
-  explicit AutoConnectTextJson(const char* name = "", const char* value = "", const char* style = "") {
+  explicit AutoConnectTextJson(const char* name = "", const char* value = "", const char* style = "", const char* format = "") {
     AutoConnectTextBasis::name = String(name);
     AutoConnectTextBasis::value = String(value);
     AutoConnectTextBasis::style = String(style);
+    AutoConnectTextBasis::format = String(format);
   }
   ~AutoConnectTextJson() {}
   size_t  getObjectSize(void) const override;
diff --git a/src/AutoConnectElementJsonImpl.h b/src/AutoConnectElementJsonImpl.h
index 3ef0394..eb53214 100644
--- a/src/AutoConnectElementJsonImpl.h
+++ b/src/AutoConnectElementJsonImpl.h
@@ -394,7 +394,7 @@ void AutoConnectSubmitJson::serialize(JsonObject& json) {
  * @return  An object size for JsonBuffer.
  */
 size_t AutoConnectTextJson::getObjectSize() const {
-  return AutoConnectElementJson::getObjectSize() + JSON_OBJECT_SIZE(1);
+  return AutoConnectElementJson::getObjectSize() + JSON_OBJECT_SIZE(2);
 }
 
 /**
@@ -409,6 +409,8 @@ bool AutoConnectTextJson::loadMember(const JsonObject& json) {
     _setMember(json);
     if (json.containsKey(F(AUTOCONNECT_JSON_KEY_STYLE)))
       style = json.get<String>(F(AUTOCONNECT_JSON_KEY_STYLE));
+    if (json.containsKey(F(AUTOCONNECT_JSON_KEY_FORMAT)))
+      format = json.get<String>(F(AUTOCONNECT_JSON_KEY_FORMAT));
     return true;
   }
   return false;
@@ -423,6 +425,7 @@ void AutoConnectTextJson::serialize(JsonObject& json) {
   json.set(F(AUTOCONNECT_JSON_KEY_TYPE), F(AUTOCONNECT_JSON_TYPE_ACTEXT));
   json.set(F(AUTOCONNECT_JSON_KEY_VALUE), value);
   json.set(F(AUTOCONNECT_JSON_KEY_STYLE), style);
+  json.set(F(AUTOCONNECT_JSON_KEY_FORMAT), format);
 }
 
 #endif // _AUTOCONNECTELEMENTJSONIMPL_H_