diff --git a/lib/core/amount_validator.dart b/lib/core/amount_validator.dart
index abf55b6b7..369bde709 100644
--- a/lib/core/amount_validator.dart
+++ b/lib/core/amount_validator.dart
@@ -23,3 +23,11 @@ class AmountValidator extends TextValidator {
     }
   }
 }
+
+class AllAmountValidator extends TextValidator {
+  AllAmountValidator() : super(
+      errorMessage: S.current.error_text_amount,
+      pattern: S.current.all,
+      minLength: 0,
+      maxLength: 0);
+}
diff --git a/lib/src/screens/send/send_page.dart b/lib/src/screens/send/send_page.dart
index 811d940dd..459e435d5 100644
--- a/lib/src/screens/send/send_page.dart
+++ b/lib/src/screens/send/send_page.dart
@@ -163,14 +163,14 @@ class SendPage extends BasePage {
                                         .decorationColor),
                                 validator: sendViewModel.addressValidator,
                               ),
-                              Padding(
+                              Observer(builder: (_) => Padding(
                                   padding: const EdgeInsets.only(top: 20),
                                   child: BaseTextFormField(
                                       focusNode: _cryptoAmountFocus,
                                       controller: _cryptoAmountController,
                                       keyboardType:
-                                          TextInputType.numberWithOptions(
-                                              signed: false, decimal: true),
+                                      TextInputType.numberWithOptions(
+                                          signed: false, decimal: true),
                                       prefixIcon: Padding(
                                         padding: EdgeInsets.only(top: 9),
                                         child: Text(
@@ -226,7 +226,9 @@ class SendPage extends BasePage {
                                           fontWeight: FontWeight.w500,
                                           fontSize: 14),
                                       validator:
-                                          sendViewModel.amountValidator)),
+                                      sendViewModel.sendAll
+                                          ? sendViewModel.allAmountValidator
+                                          : sendViewModel.amountValidator))),
                               Observer(
                                   builder: (_) => Padding(
                                         padding: EdgeInsets.only(top: 10),
@@ -513,6 +515,7 @@ class SendPage extends BasePage {
       final amount = _fiatAmountController.text;
 
       if (amount != sendViewModel.fiatAmount) {
+        sendViewModel.sendAll = false;
         sendViewModel.setFiatAmount(amount);
       }
     });
diff --git a/lib/view_model/send/send_view_model.dart b/lib/view_model/send/send_view_model.dart
index 3cdcc7bb2..d49be63f7 100644
--- a/lib/view_model/send/send_view_model.dart
+++ b/lib/view_model/send/send_view_model.dart
@@ -67,6 +67,8 @@ abstract class SendViewModelBase with Store {
 
   Validator get amountValidator => AmountValidator(type: _wallet.type);
 
+  Validator get allAmountValidator => AllAmountValidator();
+
   Validator get addressValidator => AddressValidator(type: _wallet.currency);
 
   Validator get templateValidator => TemplateValidator();