diff --git a/CHANGELOG.md b/CHANGELOG.md
index e8379620fb..4e6f37e89a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -33,6 +33,8 @@ Breaking changes:
   * CMake options `WITH_OTLP_HTTP_SSL_PREVIEW`
     and `WITH_OTLP_HTTP_SSL_TLS_PREVIEW` are removed.
     Building opentelemetry-cpp without SSL support is no longer possible.
+* [#2480] Change default OTLP Http Exporter content type from kJson to kBInary
+  See The default is http/protobuf, which means binary, [HERE](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md#specify-protocol
 
 ## [1.13.0] 2023-12-06
 
diff --git a/exporters/otlp/src/otlp_http_exporter_options.cc b/exporters/otlp/src/otlp_http_exporter_options.cc
index 3b8c6ad5b8..e605d0b260 100644
--- a/exporters/otlp/src/otlp_http_exporter_options.cc
+++ b/exporters/otlp/src/otlp_http_exporter_options.cc
@@ -17,7 +17,7 @@ namespace otlp
 OtlpHttpExporterOptions::OtlpHttpExporterOptions()
 {
   url                = GetOtlpDefaultHttpTracesEndpoint();
-  content_type       = HttpRequestContentType::kJson;
+  content_type       = HttpRequestContentType::kBinary;
   json_bytes_mapping = JsonBytesMappingKind::kHexId;
   use_json_name      = false;
   console_debug      = false;
diff --git a/exporters/otlp/src/otlp_http_log_record_exporter_options.cc b/exporters/otlp/src/otlp_http_log_record_exporter_options.cc
index 2f58bce768..5042701377 100644
--- a/exporters/otlp/src/otlp_http_log_record_exporter_options.cc
+++ b/exporters/otlp/src/otlp_http_log_record_exporter_options.cc
@@ -17,7 +17,7 @@ namespace otlp
 OtlpHttpLogRecordExporterOptions::OtlpHttpLogRecordExporterOptions()
 {
   url                = GetOtlpDefaultHttpLogsEndpoint();
-  content_type       = HttpRequestContentType::kJson;
+  content_type       = HttpRequestContentType::kBinary;
   json_bytes_mapping = JsonBytesMappingKind::kHexId;
   use_json_name      = false;
   console_debug      = false;
diff --git a/exporters/otlp/src/otlp_http_metric_exporter_options.cc b/exporters/otlp/src/otlp_http_metric_exporter_options.cc
index ffcd502bd4..27dcfd7ccb 100644
--- a/exporters/otlp/src/otlp_http_metric_exporter_options.cc
+++ b/exporters/otlp/src/otlp_http_metric_exporter_options.cc
@@ -17,7 +17,7 @@ namespace otlp
 OtlpHttpMetricExporterOptions::OtlpHttpMetricExporterOptions()
 {
   url                     = GetOtlpDefaultMetricsEndpoint();
-  content_type            = HttpRequestContentType::kJson;
+  content_type            = HttpRequestContentType::kBinary;
   json_bytes_mapping      = JsonBytesMappingKind::kHexId;
   use_json_name           = false;
   console_debug           = false;
diff --git a/exporters/otlp/test/otlp_http_exporter_test.cc b/exporters/otlp/test/otlp_http_exporter_test.cc
index 63f919c6cc..dd35122715 100644
--- a/exporters/otlp/test/otlp_http_exporter_test.cc
+++ b/exporters/otlp/test/otlp_http_exporter_test.cc
@@ -197,7 +197,7 @@ class OtlpHttpExporterTestPeer : public ::testing::Test
   void ExportJsonIntegrationTestAsync()
   {
     auto mock_otlp_client =
-        OtlpHttpExporterTestPeer::GetMockOtlpHttpClient(HttpRequestContentType::kJson, true);
+        OtlpHttpExporterTestPeer::GetMockOtlpHttpClient(HttpRequestContentType::kBinary, true);
     auto mock_otlp_http_client = mock_otlp_client.first;
     auto client                = mock_otlp_client.second;
     auto exporter = GetExporter(std::unique_ptr<OtlpHttpClient>{mock_otlp_http_client});
diff --git a/exporters/otlp/test/otlp_http_log_record_exporter_test.cc b/exporters/otlp/test/otlp_http_log_record_exporter_test.cc
index 611bebb541..3239dc58ba 100644
--- a/exporters/otlp/test/otlp_http_log_record_exporter_test.cc
+++ b/exporters/otlp/test/otlp_http_log_record_exporter_test.cc
@@ -107,7 +107,7 @@ class OtlpHttpLogRecordExporterTestPeer : public ::testing::Test
   void ExportJsonIntegrationTest()
   {
     auto mock_otlp_client =
-        OtlpHttpLogRecordExporterTestPeer::GetMockOtlpHttpClient(HttpRequestContentType::kJson);
+        OtlpHttpLogRecordExporterTestPeer::GetMockOtlpHttpClient(HttpRequestContentType::kBinary);
     auto mock_otlp_http_client = mock_otlp_client.first;
     auto client                = mock_otlp_client.second;
     auto exporter = GetExporter(std::unique_ptr<OtlpHttpClient>{mock_otlp_http_client});
@@ -221,7 +221,7 @@ class OtlpHttpLogRecordExporterTestPeer : public ::testing::Test
   void ExportJsonIntegrationTestAsync()
   {
     auto mock_otlp_client = OtlpHttpLogRecordExporterTestPeer::GetMockOtlpHttpClient(
-        HttpRequestContentType::kJson, true);
+        HttpRequestContentType::kBinary, true);
     auto mock_otlp_http_client = mock_otlp_client.first;
     auto client                = mock_otlp_client.second;
     auto exporter = GetExporter(std::unique_ptr<OtlpHttpClient>{mock_otlp_http_client});
diff --git a/exporters/otlp/test/otlp_http_metric_exporter_test.cc b/exporters/otlp/test/otlp_http_metric_exporter_test.cc
index def56682d3..0279cc40e0 100644
--- a/exporters/otlp/test/otlp_http_metric_exporter_test.cc
+++ b/exporters/otlp/test/otlp_http_metric_exporter_test.cc
@@ -117,7 +117,7 @@ class OtlpHttpMetricExporterTestPeer : public ::testing::Test
   )
   {
     auto mock_otlp_client =
-        OtlpHttpMetricExporterTestPeer::GetMockOtlpHttpClient(HttpRequestContentType::kJson
+        OtlpHttpMetricExporterTestPeer::GetMockOtlpHttpClient(HttpRequestContentType::kBinary
 #ifdef ENABLE_ASYNC_EXPORT
                                                               ,
                                                               async_mode
@@ -293,7 +293,7 @@ class OtlpHttpMetricExporterTestPeer : public ::testing::Test
   )
   {
     auto mock_otlp_client =
-        OtlpHttpMetricExporterTestPeer::GetMockOtlpHttpClient(HttpRequestContentType::kJson
+        OtlpHttpMetricExporterTestPeer::GetMockOtlpHttpClient(HttpRequestContentType::kBinary
 #ifdef ENABLE_ASYNC_EXPORT
                                                               ,
                                                               async_mode
@@ -483,7 +483,7 @@ class OtlpHttpMetricExporterTestPeer : public ::testing::Test
   )
   {
     auto mock_otlp_client =
-        OtlpHttpMetricExporterTestPeer::GetMockOtlpHttpClient(HttpRequestContentType::kJson
+        OtlpHttpMetricExporterTestPeer::GetMockOtlpHttpClient(HttpRequestContentType::kBinary
 #ifdef ENABLE_ASYNC_EXPORT
                                                               ,
                                                               async_mode