diff --git a/src/main/java/it/gov/pagopa/atmlayer/service/model/enumeration/AppErrorCodeEnum.java b/src/main/java/it/gov/pagopa/atmlayer/service/model/enumeration/AppErrorCodeEnum.java
index cb869a0e..73150d4a 100644
--- a/src/main/java/it/gov/pagopa/atmlayer/service/model/enumeration/AppErrorCodeEnum.java
+++ b/src/main/java/it/gov/pagopa/atmlayer/service/model/enumeration/AppErrorCodeEnum.java
@@ -64,7 +64,8 @@ public enum AppErrorCodeEnum {
     FILE_DECODE_ERROR("ATMLM_4000063", "Errore nella decodifica del file", GENERIC ),
     DATABASE_SAVE_FILE_ERROR("ATMLM_4000064", "Errore nella persistenza del file sul database", INTERNAL),
     OBJECT_STORE_COPY_FILE_ERROR("ATMLM_4000065", "Errore nella copia del file nella cartella DELETE su Object Store", INTERNAL),
-    INVALID_FILE_EXTENSION("ATMLM_4000066", "Estensione del file non valida", INVALID_EXTENSION);
+    INVALID_FILE_EXTENSION("ATMLM_4000066", "Estensione del file non valida", INVALID_EXTENSION),
+    BPMN_FILE_SIZE_EXCEEDS_LIMIT("ATMLM_4000066", "La dimensione del file supera quella consentita", FILE_SIZE_EXCEEDED);
     private final String errorCode;
     private final String errorMessage;
     private final AppErrorType type;
diff --git a/src/main/java/it/gov/pagopa/atmlayer/service/model/enumeration/AppErrorType.java b/src/main/java/it/gov/pagopa/atmlayer/service/model/enumeration/AppErrorType.java
index 18d078b9..fdff259f 100644
--- a/src/main/java/it/gov/pagopa/atmlayer/service/model/enumeration/AppErrorType.java
+++ b/src/main/java/it/gov/pagopa/atmlayer/service/model/enumeration/AppErrorType.java
@@ -27,5 +27,6 @@ public enum AppErrorType {
     NOT_EXISTING_USER_ID,
     NOT_EXISTING_USER_PROFILE, CANNOT_REPLACE_ASSOCIATION,
     BLANK_FIELDS,
-    INVALID_EXTENSION
+    INVALID_EXTENSION,
+    FILE_SIZE_EXCEEDED,
 }
\ No newline at end of file
diff --git a/src/main/java/it/gov/pagopa/atmlayer/service/model/service/impl/BpmnVersionServiceImpl.java b/src/main/java/it/gov/pagopa/atmlayer/service/model/service/impl/BpmnVersionServiceImpl.java
index 9c62710b..41f99390 100644
--- a/src/main/java/it/gov/pagopa/atmlayer/service/model/service/impl/BpmnVersionServiceImpl.java
+++ b/src/main/java/it/gov/pagopa/atmlayer/service/model/service/impl/BpmnVersionServiceImpl.java
@@ -30,6 +30,7 @@
 import java.util.regex.Pattern;
 
 import static it.gov.pagopa.atmlayer.service.model.enumeration.AppErrorCodeEnum.*;
+import static it.gov.pagopa.atmlayer.service.model.utils.BpmnUtils.checkFileSize;
 import static it.gov.pagopa.atmlayer.service.model.utils.BpmnUtils.getSingleConfig;
 import static it.gov.pagopa.atmlayer.service.model.utils.FileUtilities.extractIdValue;
 
@@ -215,6 +216,7 @@ public Uni<BpmnVersion> saveAndUpload(BpmnVersion bpmnVersion, File file, String
 
     @Override
     public Uni<BpmnVersion> createBPMN(BpmnVersion bpmnVersion, File file, String filename) {
+        checkFileSize(file);
         String definitionKey = extractIdValue(file, resourceType);
         bpmnVersion.setDefinitionKey(definitionKey);
         return findByDefinitionKey(definitionKey)
@@ -442,8 +444,9 @@ public Uni<BpmnVersion> getLatestVersion(UUID uuid, String functionType) {
                 });
     }
 
-    @Override
     public Uni<BpmnDTO> upgrade(BpmnUpgradeDto bpmnUpgradeDto) {
+        checkFileSize(bpmnUpgradeDto.getFile());
+
         String definitionKey = extractIdValue(bpmnUpgradeDto.getFile(), resourceType);
         return this.getLatestVersion(bpmnUpgradeDto.getUuid(), bpmnUpgradeDto.getFunctionType())
                 .onItem()
diff --git a/src/main/java/it/gov/pagopa/atmlayer/service/model/utils/BpmnUtils.java b/src/main/java/it/gov/pagopa/atmlayer/service/model/utils/BpmnUtils.java
index ced42195..27bf16f4 100644
--- a/src/main/java/it/gov/pagopa/atmlayer/service/model/utils/BpmnUtils.java
+++ b/src/main/java/it/gov/pagopa/atmlayer/service/model/utils/BpmnUtils.java
@@ -13,11 +13,11 @@
 import jakarta.ws.rs.core.Response;
 import org.apache.commons.lang3.StringUtils;
 
+import java.io.File;
 import java.util.*;
 import java.util.stream.Collectors;
 
-import static it.gov.pagopa.atmlayer.service.model.enumeration.AppErrorCodeEnum.DUPLICATE_ASSOCIATION_CONFIGS;
-import static it.gov.pagopa.atmlayer.service.model.enumeration.AppErrorCodeEnum.ILLEGAL_CONFIGURATION_TRIPLET;
+import static it.gov.pagopa.atmlayer.service.model.enumeration.AppErrorCodeEnum.*;
 
 @ApplicationScoped
 public class BpmnUtils {
@@ -129,4 +129,10 @@ public static BpmnBankConfig getSingleConfig(BpmnVersionPK bpmnVersionPK, String
         bpmnBankConfig.setFunctionType(functionType);
         return bpmnBankConfig;
     }
+
+    public static void checkFileSize(File file) {
+        if (file.length() > 1024 * 1024) {
+            throw new AtmLayerException("La dimensione del file supera 1MB", Response.Status.BAD_REQUEST, BPMN_FILE_SIZE_EXCEEDS_LIMIT);
+        }
+    }
 }