diff --git a/modules/openapi-generator-online/src/main/java/org/openapitools/codegen/online/model/GeneratorInput.java b/modules/openapi-generator-online/src/main/java/org/openapitools/codegen/online/model/GeneratorInput.java
index 0844839e9e5c..be8f8c55f370 100644
--- a/modules/openapi-generator-online/src/main/java/org/openapitools/codegen/online/model/GeneratorInput.java
+++ b/modules/openapi-generator-online/src/main/java/org/openapitools/codegen/online/model/GeneratorInput.java
@@ -23,6 +23,7 @@
 import lombok.Getter;
 import lombok.Setter;
 
+import java.util.List;
 import java.util.Map;
 
 @Setter
@@ -31,6 +32,8 @@ public class GeneratorInput {
     @Getter private Map<String, String> options;
     private String openAPIUrl;
     @Getter private AuthorizationValue authorizationValue;
+    //FILTER=operationId:updatePet
+    @Getter private List<String> openapiNormalizer;
 
     @ApiModelProperty(example = "https://raw.githubusercontent.com/OpenAPITools/openapi-generator/master/modules/openapi-generator/src/test/resources/2_0/petstore.yaml")
     public String getOpenAPIUrl() {
diff --git a/modules/openapi-generator-online/src/main/java/org/openapitools/codegen/online/service/Generator.java b/modules/openapi-generator-online/src/main/java/org/openapitools/codegen/online/service/Generator.java
index be5326278cb2..aa3993fbd85f 100644
--- a/modules/openapi-generator-online/src/main/java/org/openapitools/codegen/online/service/Generator.java
+++ b/modules/openapi-generator-online/src/main/java/org/openapitools/codegen/online/service/Generator.java
@@ -118,6 +118,7 @@ private static String generate(String language, GeneratorInput opts, Type type)
             throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "The OpenAPI specification supplied was not valid");
         }
 
+
         // do not use opts.getOptions().get("outputFolder") as the input can contain ../../
         // to access other folders in the server
         String destPath = language + "-" + type.getTypeName();
@@ -140,6 +141,16 @@ private static String generate(String language, GeneratorInput opts, Type type)
             codegenConfig.additionalProperties().put("openAPI", openapi);
         }
 
+        if(opts.getOpenapiNormalizer() != null && !opts.getOpenapiNormalizer().isEmpty()){
+            for(String rule: opts.getOpenapiNormalizer()){
+                String[] ruleOperands = rule.split("=");
+                if(ruleOperands.length != 2) {
+                    throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "In rule: " + rule + "the operands were not provided in the form of <Rule>=<Value>");
+                }
+                codegenConfig.openapiNormalizer().put(ruleOperands[0],ruleOperands[1]);
+            }
+        }
+
         codegenConfig.setOutputDir(outputFolder);
 
         clientOptInput.config(codegenConfig);
diff --git a/modules/openapi-generator-online/src/test/java/org/openapitools/codegen/online/api/GenApiControllerTest.java b/modules/openapi-generator-online/src/test/java/org/openapitools/codegen/online/api/GenApiControllerTest.java
index c29405b7cfa8..7855d3405a49 100644
--- a/modules/openapi-generator-online/src/test/java/org/openapitools/codegen/online/api/GenApiControllerTest.java
+++ b/modules/openapi-generator-online/src/test/java/org/openapitools/codegen/online/api/GenApiControllerTest.java
@@ -10,6 +10,7 @@
 import org.springframework.http.MediaType;
 import org.springframework.test.context.junit.jupiter.SpringExtension;
 import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.util.Assert;
 
 import static org.hamcrest.Matchers.hasItem;
 import static org.hamcrest.Matchers.not;
@@ -133,4 +134,32 @@ public void generateClientWithInvalidOpenAPIUrl() throws Exception {
                         .content("{\"openAPIUrl\": \"" + invalidOpenAPIUrl + "\"}"))
                 .andExpect(status().isBadRequest());
     }
+
+    @Test
+    public void generateWithOpenAPINormalizer() throws Exception {
+        String withOpenAPINormalizer = "{\"openAPIUrl\":\"https://raw.githubusercontent.com/OpenAPITools/openapi-generator/master/modules/openapi-generator/src/test/resources/2_0/petstore.yaml\",\"openapiNormalizer\":[\"FILTER=operationId:updatePet\"],\"options\":{},\"spec\":{}}";
+        String withoutOpenAPINormalizer = "{\"openAPIUrl\":\"https://raw.githubusercontent.com/OpenAPITools/openapi-generator/master/modules/openapi-generator/src/test/resources/2_0/petstore.yaml\",\"options\":{},\"spec\":{}}";
+
+        String responseOfNormalized = mockMvc.perform(post("http://test.com:1234/api/gen/clients/java")
+                .contentType(MediaType.APPLICATION_JSON)
+                .content(withOpenAPINormalizer))
+                .andExpect(status().isOk()).andReturn().getResponse().getContentAsString();
+        String codeOfNormalized = new ObjectMapper().readValue(responseOfNormalized, ResponseCode.class).getCode();
+        Long lengthOfNormalized = Long.parseLong(mockMvc.perform(get("http://test.com:1234/api/gen/download/" + codeOfNormalized))
+                .andExpect(content().contentType("application/zip"))
+                .andExpect(status().isOk()).andReturn().getResponse().getHeader("Content-Length"));
+
+        String responseOfNotNormalized = mockMvc.perform(post("http://test.com:1234/api/gen/clients/java")
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(withoutOpenAPINormalizer))
+                .andExpect(status().isOk()).andReturn().getResponse().getContentAsString();
+
+        String codeOfNotNormalized = new ObjectMapper().readValue(responseOfNotNormalized, ResponseCode.class).getCode();
+        Long lengthOfNotNormalized = Long.parseLong(mockMvc.perform(get("http://test.com:1234/api/gen/download/" + codeOfNotNormalized))
+                .andExpect(content().contentType("application/zip"))
+                .andExpect(status().isOk()).andReturn().getResponse().getHeader("Content-Length"));
+
+        Assert.isTrue(lengthOfNormalized <= lengthOfNotNormalized,"Using the normalizer should result in a smaller or equal file size");
+
+    }
 }