diff --git a/google/cloud/translate/v3/BUILD.bazel b/google/cloud/translate/v3/BUILD.bazel
index 70d6e63de..00d22650d 100644
--- a/google/cloud/translate/v3/BUILD.bazel
+++ b/google/cloud/translate/v3/BUILD.bazel
@@ -1,4 +1,13 @@
 # This file was automatically generated by BuildFileGenerator
+# https://github.com/googleapis/rules_gapic/tree/master/bazel
+
+# Most of the manual changes to this file will be overwritten.
+# It's **only** allowed to change the following rule attribute values:
+# - names of *_gapic_assembly_* rules
+# - certain parameters of *_gapic_library rules, including but not limited to:
+#    * extra_protoc_parameters
+#    * extra_protoc_file_parameters
+# The complete list of preserved parameters can be found in the source code.
 
 # This is an API workspace, having public visibility by default makes perfect sense.
 package(default_visibility = ["//visibility:public"])
@@ -20,6 +29,8 @@ proto_library(
         "//google/api:field_behavior_proto",
         "//google/api:resource_proto",
         "//google/longrunning:operations_proto",
+        "//google/rpc:status_proto",
+        "@com_google_protobuf//:empty_proto",
         "@com_google_protobuf//:timestamp_proto",
     ],
 )
@@ -58,12 +69,18 @@ java_grpc_library(
 java_gapic_library(
     name = "translation_java_gapic",
     srcs = [":translation_proto_with_info"],
+    gapic_yaml = None,
     grpc_service_config = "translate_grpc_service_config.json",
+    service_yaml = "translate_v3.yaml",
     test_deps = [
         ":translation_java_grpc",
+        "//google/cloud/location:location_java_grpc",
     ],
     deps = [
         ":translation_java_proto",
+        "//google/api:api_java_proto",
+        "//google/cloud/location:location_java_grpc",
+        "//google/cloud/location:location_java_proto",
     ],
 )
 
@@ -83,6 +100,9 @@ java_gapic_assembly_gradle_pkg(
         ":translation_java_grpc",
         ":translation_java_proto",
         ":translation_proto",
+        "//google/cloud/location:location_java_grpc",
+        "//google/cloud/location:location_java_proto",
+        "//google/cloud/location:location_proto",
     ],
 )
 
@@ -105,6 +125,7 @@ go_proto_library(
     deps = [
         "//google/api:annotations_go_proto",
         "//google/longrunning:longrunning_go_proto",
+        "//google/rpc:status_go_proto",
     ],
 )
 
@@ -113,9 +134,11 @@ go_gapic_library(
     srcs = [":translation_proto_with_info"],
     grpc_service_config = "translate_grpc_service_config.json",
     importpath = "cloud.google.com/go/translate/apiv3;translate",
+    metadata = True,
     service_yaml = "translate_v3.yaml",
     deps = [
         ":translation_go_proto",
+        "//google/cloud/location:location_go_proto",
         "//google/longrunning:longrunning_go_proto",
         "@com_google_cloud_go//longrunning:go_default_library",
         "@com_google_cloud_go//longrunning/autogen:go_default_library",
@@ -134,6 +157,7 @@ go_gapic_assembly_pkg(
     name = "gapi-cloud-translation-v3-go",
     deps = [
         ":translation_go_gapic",
+        ":translation_go_gapic_srcjar-metadata.srcjar",
         ":translation_go_gapic_srcjar-test.srcjar",
         ":translation_go_proto",
     ],
@@ -155,6 +179,7 @@ py_gapic_library(
     opt_args = ["python-gapic-name=translate"],
 )
 
+# Open Source Packages
 py_gapic_assembly_pkg(
     name = "translation-v3-py",
     deps = [
@@ -188,6 +213,7 @@ php_gapic_library(
     name = "translation_php_gapic",
     srcs = [":translation_proto_with_info"],
     grpc_service_config = "translate_grpc_service_config.json",
+    service_yaml = "translate_v3.yaml",
     deps = [
         ":translation_php_grpc",
         ":translation_php_proto",
@@ -258,11 +284,11 @@ ruby_cloud_gapic_library(
     name = "translation_ruby_gapic",
     srcs = [":translation_proto_with_info"],
     extra_protoc_parameters = [
-        "ruby-cloud-gem-name=google-cloud-translate-v3",
-        "ruby-cloud-env-prefix=TRANSLATE",
-        "ruby-cloud-product-url=https://cloud.google.com/translate",
         "ruby-cloud-api-id=translate.googleapis.com",
         "ruby-cloud-api-shortname=translate",
+        "ruby-cloud-env-prefix=TRANSLATE",
+        "ruby-cloud-gem-name=google-cloud-translate-v3",
+        "ruby-cloud-product-url=https://cloud.google.com/translate",
     ],
     grpc_service_config = "translate_grpc_service_config.json",
     ruby_cloud_description = "Cloud Translation can dynamically translate text between thousands of language pairs. Translation lets websites and programs programmatically integrate with the translation service.",
diff --git a/google/cloud/translate/v3/translate_grpc_service_config.json b/google/cloud/translate/v3/translate_grpc_service_config.json
index 657011c12..43112726c 100755
--- a/google/cloud/translate/v3/translate_grpc_service_config.json
+++ b/google/cloud/translate/v3/translate_grpc_service_config.json
@@ -47,6 +47,14 @@
         {
           "service": "google.cloud.translation.v3.TranslationService",
           "method": "CreateGlossary"
+        },
+        {
+          "service": "google.cloud.translation.v3.TranslationService",
+          "method": "TranslateDocument"
+        },
+        {
+          "service": "google.cloud.translation.v3.TranslationService",
+          "method": "BatchTranslateDocument"
         }
       ],
       "timeout": "600s"
diff --git a/google/cloud/translate/v3/translate_v3.yaml b/google/cloud/translate/v3/translate_v3.yaml
index dad626213..bc305999e 100644
--- a/google/cloud/translate/v3/translate_v3.yaml
+++ b/google/cloud/translate/v3/translate_v3.yaml
@@ -8,21 +8,64 @@ apis:
 
 documentation:
   summary: Integrates text translation into your website or application.
+  rules:
+  - selector: google.cloud.location.Locations.GetLocation
+    description: Gets information about a location.
+
+  - selector: google.cloud.location.Locations.ListLocations
+    description: Lists information about the supported locations for this service.
 
 backend:
   rules:
+  - selector: google.cloud.location.Locations.GetLocation
+    deadline: 30.0
+  - selector: google.cloud.location.Locations.ListLocations
+    deadline: 30.0
   - selector: 'google.longrunning.Operations.*'
     deadline: 60.0
   - selector: google.longrunning.Operations.WaitOperation
     deadline: 120.0
 
+http:
+  rules:
+  - selector: google.cloud.location.Locations.GetLocation
+    get: '/v3/{name=projects/*/locations/*}'
+  - selector: google.cloud.location.Locations.ListLocations
+    get: '/v3/{name=projects/*}/locations'
+  - selector: google.longrunning.Operations.CancelOperation
+    post: '/v3/{name=projects/*/locations/*/operations/*}:cancel'
+    body: '*'
+  - selector: google.longrunning.Operations.DeleteOperation
+    delete: '/v3/{name=projects/*/locations/*/operations/*}'
+  - selector: google.longrunning.Operations.GetOperation
+    get: '/v3/{name=projects/*/locations/*/operations/*}'
+  - selector: google.longrunning.Operations.ListOperations
+    get: '/v3/{name=projects/*/locations/*}/operations'
+  - selector: google.longrunning.Operations.WaitOperation
+    post: '/v3/{name=projects/*/locations/*/operations/*}:wait'
+    body: '*'
+
 authentication:
   rules:
+  - selector: google.cloud.location.Locations.GetLocation
+    oauth:
+      canonical_scopes: |-
+        https://www.googleapis.com/auth/cloud-platform,
+        https://www.googleapis.com/auth/cloud-translation
+  - selector: google.cloud.location.Locations.ListLocations
+    oauth:
+      canonical_scopes: |-
+        https://www.googleapis.com/auth/cloud-platform,
+        https://www.googleapis.com/auth/cloud-translation
   - selector: 'google.cloud.translation.v3.TranslationService.*'
     oauth:
       canonical_scopes: |-
         https://www.googleapis.com/auth/cloud-platform,
         https://www.googleapis.com/auth/cloud-translation
+  - selector: google.cloud.translation.v3.TranslationService.BatchTranslateDocument
+    oauth:
+      canonical_scopes: |-
+        https://www.googleapis.com/auth/cloud-platform
   - selector: google.cloud.translation.v3.TranslationService.BatchTranslateText
     oauth:
       canonical_scopes: |-
diff --git a/google/cloud/translate/v3/translation_service.proto b/google/cloud/translate/v3/translation_service.proto
index 3e939a5d2..070786cef 100644
--- a/google/cloud/translate/v3/translation_service.proto
+++ b/google/cloud/translate/v3/translation_service.proto
@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC.
+// Copyright 2021 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +11,6 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-//
 
 syntax = "proto3";
 
@@ -22,7 +21,9 @@ import "google/api/client.proto";
 import "google/api/field_behavior.proto";
 import "google/api/resource.proto";
 import "google/longrunning/operations.proto";
+import "google/protobuf/empty.proto";
 import "google/protobuf/timestamp.proto";
+import "google/rpc/status.proto";
 
 option cc_enable_arenas = true;
 option csharp_namespace = "Google.Cloud.Translate.V3";
@@ -81,6 +82,15 @@ service TranslationService {
     option (google.api.method_signature) = "parent,model,display_language_code";
   }
 
+  // Translates documents in synchronous mode.
+  rpc TranslateDocument(TranslateDocumentRequest)
+      returns (TranslateDocumentResponse) {
+    option (google.api.http) = {
+      post: "/v3/{parent=projects/*/locations/*}:translateDocument"
+      body: "*"
+    };
+  }
+
   // Translates a large volume of text in asynchronous batch mode.
   // This function provides real-time output as the inputs are being processed.
   // If caller cancels a request, the partial results (for an input file, it's
@@ -100,6 +110,25 @@ service TranslationService {
     };
   }
 
+  // Translates a large volume of document in asynchronous batch mode.
+  // This function provides real-time output as the inputs are being processed.
+  // If caller cancels a request, the partial results (for an input file, it's
+  // all or nothing) may still be available on the specified output location.
+  //
+  // This call returns immediately and you can use
+  // google.longrunning.Operation.name to poll the status of the call.
+  rpc BatchTranslateDocument(BatchTranslateDocumentRequest)
+      returns (google.longrunning.Operation) {
+    option (google.api.http) = {
+      post: "/v3/{parent=projects/*/locations/*}:batchTranslateDocument"
+      body: "*"
+    };
+    option (google.longrunning.operation_info) = {
+      response_type: "BatchTranslateDocumentResponse"
+      metadata_type: "BatchTranslateDocumentMetadata"
+    };
+  }
+
   // Creates a glossary and returns the long-running operation. Returns
   // NOT_FOUND, if the project doesn't exist.
   rpc CreateGlossary(CreateGlossaryRequest)
@@ -152,8 +181,12 @@ service TranslationService {
 // Configures which glossary should be used for a specific target language,
 // and defines options for applying that glossary.
 message TranslateTextGlossaryConfig {
-  // Required. Specifies the glossary used for this translation. Use
-  // this format: projects/*/locations/*/glossaries/*
+  // Required. The `glossary` to be applied for this translation.
+  //
+  // The format depends on glossary:
+  //
+  // - User provided custom glossary:
+  //   `projects/{project-number-or-id}/locations/{location-id}/glossaries/{glossary-id}`
   string glossary = 1 [(google.api.field_behavior) = REQUIRED];
 
   // Optional. Indicates match is case-insensitive.
@@ -164,7 +197,8 @@ message TranslateTextGlossaryConfig {
 // The request message for synchronous translation.
 message TranslateTextRequest {
   // Required. The content of the input in string format.
-  // We recommend the total content be less than 30k codepoints.
+  // We recommend the total content be less than 30k codepoints. The max length
+  // of this field is 1024.
   // Use BatchTranslateText for larger text.
   repeated string contents = 1 [(google.api.field_behavior) = REQUIRED];
 
@@ -213,14 +247,13 @@ message TranslateTextRequest {
   //
   // - General (built-in) models:
   //   `projects/{project-number-or-id}/locations/{location-id}/models/general/nmt`,
-  //   `projects/{project-number-or-id}/locations/{location-id}/models/general/base`
   //
   //
   // For global (non-regionalized) requests, use `location-id` `global`.
   // For example,
   // `projects/{project-number-or-id}/locations/global/models/general/nmt`.
   //
-  // If missing, the system decides which google base model to use.
+  // If not provided, the default Google model (NMT) will be used.
   string model = 6 [(google.api.field_behavior) = OPTIONAL];
 
   // Optional. Glossary to be applied. The glossary must be
@@ -236,7 +269,8 @@ message TranslateTextRequest {
   // characters, underscores and dashes. International characters are allowed.
   // Label values are optional. Label keys must start with a letter.
   //
-  // See https://cloud.google.com/translate/docs/labels for more information.
+  // See https://cloud.google.com/translate/docs/advanced/labels for more
+  // information.
   map<string, string> labels = 10 [(google.api.field_behavior) = OPTIONAL];
 }
 
@@ -257,6 +291,8 @@ message TranslateTextResponse {
 // A single translation response.
 message Translation {
   // Text translated into the target language.
+  // If an error occurs during translation, this field might be excluded from
+  // the response.
   string translated_text = 1;
 
   // Only present when `model` is present in the request.
@@ -327,7 +363,8 @@ message DetectLanguageRequest {
   // characters, underscores and dashes. International characters are allowed.
   // Label values are optional. Label keys must start with a letter.
   //
-  // See https://cloud.google.com/translate/docs/labels for more information.
+  // See https://cloud.google.com/translate/docs/advanced/labels for more
+  // information.
   map<string, string> labels = 6 [(google.api.field_behavior) = OPTIONAL];
 }
 
@@ -343,8 +380,8 @@ message DetectedLanguage {
 
 // The response message for language detection.
 message DetectLanguageResponse {
-  // A list of detected languages sorted by detection confidence in descending
-  // order. The most probable language first.
+  // The most probable language detected by the Translation API. For each
+  // request, the Translation API will always return only one result.
   repeated DetectedLanguage languages = 1;
 }
 
@@ -384,11 +421,10 @@ message GetSupportedLanguagesRequest {
   //
   // - General (built-in) models:
   //   `projects/{project-number-or-id}/locations/{location-id}/models/general/nmt`,
-  //   `projects/{project-number-or-id}/locations/{location-id}/models/general/base`
   //
   //
   // Returns languages supported by the specified model.
-  // If missing, we get supported languages of Google general base (PBMT) model.
+  // If missing, we get supported languages of Google general NMT model.
   string model = 2 [(google.api.field_behavior) = OPTIONAL];
 }
 
@@ -422,7 +458,7 @@ message SupportedLanguage {
 // The Google Cloud Storage location for the input content.
 message GcsSource {
   // Required. Source data URI. For example, `gs://my_bucket/my_object`.
-  string input_uri = 1;
+  string input_uri = 1 [(google.api.field_behavior) = REQUIRED];
 }
 
 // Input configuration for BatchTranslateText request.
@@ -459,10 +495,12 @@ message InputConfig {
 
 // The Google Cloud Storage location for the output content.
 message GcsDestination {
-  // Required. There must be no files under 'output_uri_prefix'.
-  // 'output_uri_prefix' must end with "/" and start with "gs://", otherwise an
-  // INVALID_ARGUMENT (400) error is returned.
-  string output_uri_prefix = 1;
+  // Required. The bucket used in 'output_uri_prefix' must exist and there must
+  // be no files under 'output_uri_prefix'. 'output_uri_prefix' must end with
+  // "/" and start with "gs://". One 'output_uri_prefix' can only be used by one
+  // batch translation job at a time. Otherwise an INVALID_ARGUMENT (400) error
+  // is returned.
+  string output_uri_prefix = 1 [(google.api.field_behavior) = REQUIRED];
 }
 
 // Output configuration for BatchTranslateText request.
@@ -501,8 +539,13 @@ message OutputConfig {
     // processed and ready to be consumed (that is, no partial output file is
     // written).
     //
+    // Since index.csv will be keeping updated during the process, please make
+    // sure there is no custom retention policy applied on the output bucket
+    // that may avoid file updating.
+    // (https://cloud.google.com/storage/docs/bucket-lock?hl=en#retention-policy)
+    //
     // The format of translations_file (for target language code 'trg') is:
-    // `gs://translation_test/a_b_c_'trg'_translations.[extension]`
+    // gs://translation_test/a_b_c_'trg'_translations.[extension]
     //
     // If the input file extension is tsv, the output has the following
     // columns:
@@ -519,10 +562,10 @@ message OutputConfig {
     // If input file extension is a txt or html, the translation is directly
     // written to the output file. If glossary is requested, a separate
     // glossary_translations_file has format of
-    // `gs://translation_test/a_b_c_'trg'_glossary_translations.[extension]`
+    // gs://translation_test/a_b_c_'trg'_glossary_translations.[extension]
     //
     // The format of errors file (for target language code 'trg') is:
-    // `gs://translation_test/a_b_c_'trg'_errors.[extension]`
+    // gs://translation_test/a_b_c_'trg'_errors.[extension]
     //
     // If the input file extension is tsv, errors_file contains the following:
     // Column 1: ID of the request provided in the input, if it's not
@@ -534,11 +577,224 @@ message OutputConfig {
     //
     // If the input file extension is txt or html, glossary_error_file will be
     // generated that contains error details. glossary_error_file has format of
-    // `gs://translation_test/a_b_c_'trg'_glossary_errors.[extension]`
+    // gs://translation_test/a_b_c_'trg'_glossary_errors.[extension]
     GcsDestination gcs_destination = 1;
   }
 }
 
+// A document translation request input config.
+message DocumentInputConfig {
+  // Specifies the source for the document's content.
+  // The input file size should be <= 20MB for
+  // - application/vnd.openxmlformats-officedocument.wordprocessingml.document
+  // - application/vnd.openxmlformats-officedocument.presentationml.presentation
+  // - application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
+  // The input file size should be <= 20MB and the maximum page limit is 20 for
+  // - application/pdf
+  oneof source {
+    // Document's content represented as a stream of bytes.
+    bytes content = 1;
+
+    // Google Cloud Storage location. This must be a single file.
+    // For example: gs://example_bucket/example_file.pdf
+    GcsSource gcs_source = 2;
+  }
+
+  // Specifies the input document's mime_type.
+  //
+  // If not specified it will be determined using the file extension for
+  // gcs_source provided files. For a file provided through bytes content the
+  // mime_type must be provided.
+  // Currently supported mime types are:
+  // - application/pdf
+  // - application/vnd.openxmlformats-officedocument.wordprocessingml.document
+  // - application/vnd.openxmlformats-officedocument.presentationml.presentation
+  // - application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
+  string mime_type = 4;
+}
+
+// A document translation request output config.
+message DocumentOutputConfig {
+  // A URI destination for the translated document.
+  // It is optional to provide a destination. If provided the results from
+  // TranslateDocument will be stored in the destination.
+  // Whether a destination is provided or not, the translated documents will be
+  // returned within TranslateDocumentResponse.document_translation and
+  // TranslateDocumentResponse.glossary_document_translation.
+  oneof destination {
+    // Optional. Google Cloud Storage destination for the translation output,
+    // e.g., `gs://my_bucket/my_directory/`.
+    //
+    // The destination directory provided does not have to be empty, but the
+    // bucket must exist. If a file with the same name as the output file
+    // already exists in the destination an error will be returned.
+    //
+    // For a DocumentInputConfig.contents provided document, the output file
+    // will have the name "output_[trg]_translations.[ext]", where
+    // - [trg] corresponds to the translated file's language code,
+    // - [ext] corresponds to the translated file's extension according to its
+    // mime type.
+    //
+    //
+    // For a DocumentInputConfig.gcs_uri provided document, the output file will
+    // have a name according to its URI. For example: an input file with URI:
+    // "gs://a/b/c.[extension]" stored in a gcs_destination bucket with name
+    // "my_bucket" will have an output URI:
+    // "gs://my_bucket/a_b_c_[trg]_translations.[ext]", where
+    // - [trg] corresponds to the translated file's language code,
+    // - [ext] corresponds to the translated file's extension according to its
+    // mime type.
+    //
+    //
+    // If the document was directly provided through the request, then the
+    // output document will have the format:
+    // "gs://my_bucket/translated_document_[trg]_translations.[ext], where
+    // - [trg] corresponds to the translated file's language code,
+    // - [ext] corresponds to the translated file's extension according to its
+    // mime type.
+    //
+    // If a glossary was provided, then the output URI for the glossary
+    // translation will be equal to the default output URI but have
+    // `glossary_translations` instead of `translations`. For the previous
+    // example, its glossary URI would be:
+    // "gs://my_bucket/a_b_c_[trg]_glossary_translations.[ext]".
+    //
+    // Thus the max number of output files will be 2 (Translated document,
+    // Glossary translated document).
+    //
+    // Callers should expect no partial outputs. If there is any error during
+    // document translation, no output will be stored in the Cloud Storage
+    // bucket.
+    GcsDestination gcs_destination = 1 [(google.api.field_behavior) = OPTIONAL];
+  }
+
+  // Optional. Specifies the translated document's mime_type.
+  // If not specified, the translated file's mime type will be the same as the
+  // input file's mime type.
+  // Currently only support the output mime type to be the same as input mime
+  // type.
+  // - application/pdf
+  // - application/vnd.openxmlformats-officedocument.wordprocessingml.document
+  // - application/vnd.openxmlformats-officedocument.presentationml.presentation
+  // - application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
+  string mime_type = 3 [(google.api.field_behavior) = OPTIONAL];
+}
+
+// A document translation request.
+message TranslateDocumentRequest {
+  // Required. Location to make a regional call.
+  //
+  // Format: `projects/{project-number-or-id}/locations/{location-id}`.
+  //
+  // For global calls, use `projects/{project-number-or-id}/locations/global` or
+  // `projects/{project-number-or-id}`.
+  //
+  // Non-global location is required for requests using AutoML models or custom
+  // glossaries.
+  //
+  // Models and glossaries must be within the same region (have the same
+  // location-id), otherwise an INVALID_ARGUMENT (400) error is returned.
+  string parent = 1 [(google.api.field_behavior) = REQUIRED];
+
+  // Optional. The BCP-47 language code of the input document if known, for
+  // example, "en-US" or "sr-Latn". Supported language codes are listed in
+  // Language Support. If the source language isn't specified, the API attempts
+  // to identify the source language automatically and returns the source
+  // language within the response. Source language must be specified if the
+  // request contains a glossary or a custom model.
+  string source_language_code = 2 [(google.api.field_behavior) = OPTIONAL];
+
+  // Required. The BCP-47 language code to use for translation of the input
+  // document, set to one of the language codes listed in Language Support.
+  string target_language_code = 3 [(google.api.field_behavior) = REQUIRED];
+
+  // Required. Input configurations.
+  DocumentInputConfig document_input_config = 4
+      [(google.api.field_behavior) = REQUIRED];
+
+  // Optional. Output configurations.
+  // Defines if the output file should be stored within Cloud Storage as well
+  // as the desired output format. If not provided the translated file will
+  // only be returned through a byte-stream and its output mime type will be
+  // the same as the input file's mime type.
+  DocumentOutputConfig document_output_config = 5
+      [(google.api.field_behavior) = OPTIONAL];
+
+  // Optional. The `model` type requested for this translation.
+  //
+  // The format depends on model type:
+  //
+  // - AutoML Translation models:
+  //   `projects/{project-number-or-id}/locations/{location-id}/models/{model-id}`
+  //
+  // - General (built-in) models:
+  //   `projects/{project-number-or-id}/locations/{location-id}/models/general/nmt`,
+  //
+  //
+  // If not provided, the default Google model (NMT) will be used for
+  // translation.
+  string model = 6 [(google.api.field_behavior) = OPTIONAL];
+
+  // Optional. Glossary to be applied. The glossary must be within the same
+  // region (have the same location-id) as the model, otherwise an
+  // INVALID_ARGUMENT (400) error is returned.
+  TranslateTextGlossaryConfig glossary_config = 7
+      [(google.api.field_behavior) = OPTIONAL];
+
+  // Optional. The labels with user-defined metadata for the request.
+  //
+  // Label keys and values can be no longer than 63 characters (Unicode
+  // codepoints), can only contain lowercase letters, numeric characters,
+  // underscores and dashes. International characters are allowed. Label values
+  // are optional. Label keys must start with a letter.
+  //
+  // See https://cloud.google.com/translate/docs/advanced/labels for more
+  // information.
+  map<string, string> labels = 8 [(google.api.field_behavior) = OPTIONAL];
+}
+
+// A translated document message.
+message DocumentTranslation {
+  // The array of translated documents. It is expected to be size 1 for now. We
+  // may produce multiple translated documents in the future for other type of
+  // file formats.
+  repeated bytes byte_stream_outputs = 1;
+
+  // The translated document's mime type.
+  string mime_type = 2;
+
+  // The detected language for the input document.
+  // If the user did not provide the source language for the input document,
+  // this field will have the language code automatically detected. If the
+  // source language was passed, auto-detection of the language does not occur
+  // and this field is empty.
+  string detected_language_code = 3;
+}
+
+// A translated document response message.
+message TranslateDocumentResponse {
+  // Translated document.
+  DocumentTranslation document_translation = 1;
+
+  // The document's translation output if a glossary is provided in the request.
+  // This can be the same as [TranslateDocumentResponse.document_translation]
+  // if no glossary terms apply.
+  DocumentTranslation glossary_document_translation = 2;
+
+  // Only present when 'model' is present in the request.
+  // 'model' is normalized to have a project number.
+  //
+  // For example:
+  // If the 'model' field in TranslateDocumentRequest is:
+  // `projects/{project-id}/locations/{location-id}/models/general/nmt` then
+  // `model` here would be normalized to
+  // `projects/{project-number}/locations/{location-id}/models/general/nmt`.
+  string model = 3;
+
+  // The `glossary_config` used for this translation.
+  TranslateTextGlossaryConfig glossary_config = 4;
+}
+
 // The batch translation request.
 message BatchTranslateTextRequest {
   // Required. Location to make a call. Must refer to a caller's project.
@@ -575,7 +831,6 @@ message BatchTranslateTextRequest {
   //
   // - General (built-in) models:
   //   `projects/{project-number-or-id}/locations/{location-id}/models/general/nmt`,
-  //   `projects/{project-number-or-id}/locations/{location-id}/models/general/base`
   //
   //
   // If the map is empty or a specific model is
@@ -583,7 +838,7 @@ message BatchTranslateTextRequest {
   map<string, string> models = 4 [(google.api.field_behavior) = OPTIONAL];
 
   // Required. Input configurations.
-  // The total number of files matched should be <= 1000.
+  // The total number of files matched should be <= 100.
   // The total content size should be <= 100M Unicode codepoints.
   // The files must use UTF-8 encoding.
   repeated InputConfig input_configs = 5
@@ -606,7 +861,8 @@ message BatchTranslateTextRequest {
   // characters, underscores and dashes. International characters are allowed.
   // Label values are optional. Label keys must start with a letter.
   //
-  // See https://cloud.google.com/translate/docs/labels for more information.
+  // See https://cloud.google.com/translate/docs/advanced/labels for more
+  // information.
   map<string, string> labels = 9 [(google.api.field_behavior) = OPTIONAL];
 }
 
@@ -702,9 +958,8 @@ message GlossaryInputConfig {
     // For equivalent term sets glossaries:
     //
     // - CSV (`.csv`): Multi-column CSV file defining equivalent glossary terms
-    //   in multiple languages. The format is defined for Google Translation
-    //   Toolkit and documented in [Use a
-    //   glossary](https://support.google.com/translatortoolkit/answer/6306379?hl=en).
+    //   in multiple languages. See documentation for more information -
+    //   [glossaries](https://cloud.google.com/translate/docs/advanced/glossary).
     GcsSource gcs_source = 1;
   }
 }
@@ -737,7 +992,7 @@ message Glossary {
 
   // Required. The resource name of the glossary. Glossary names have the form
   // `projects/{project-number-or-id}/locations/{location-id}/glossaries/{glossary-id}`.
-  string name = 1;
+  string name = 1 [(google.api.field_behavior) = REQUIRED];
 
   // Languages supported by the glossary.
   oneof languages {
@@ -821,7 +1076,20 @@ message ListGlossariesRequest {
   string page_token = 3 [(google.api.field_behavior) = OPTIONAL];
 
   // Optional. Filter specifying constraints of a list operation.
-  // Filtering is not supported yet, and the parameter currently has no effect.
+  // Specify the constraint by the format of "key=value", where key must be
+  // "src" or "tgt", and the value must be a valid language code.
+  // For multiple restrictions, concatenate them by "AND" (uppercase only),
+  // such as: "src=en-US AND tgt=zh-CN". Notice that the exact match is used
+  // here, which means using 'en-US' and 'en' can lead to different results,
+  // which depends on the language code you used when you create the glossary.
+  // For the unidirectional glossaries, the "src" and "tgt" add restrictions
+  // on the source and target language code separately.
+  // For the equivalent term set glossaries, the "src" and/or "tgt" add
+  // restrictions on the term set.
+  // For example: "src=en-US AND tgt=zh-CN" will only pick the unidirectional
+  // glossaries which exactly match the source language code as "en-US" and the
+  // target language code "zh-CN", but all equivalent term set glossaries which
+  // contain "en-US" and "zh-CN" in their language set will be picked.
   // If missing, no filtering is performed.
   string filter = 4 [(google.api.field_behavior) = OPTIONAL];
 }
@@ -924,3 +1192,269 @@ message DeleteGlossaryResponse {
   // set to true.
   google.protobuf.Timestamp end_time = 3;
 }
+
+// The BatchTranslateDocument request.
+message BatchTranslateDocumentRequest {
+  // Required. Location to make a regional call.
+  //
+  // Format: `projects/{project-number-or-id}/locations/{location-id}`.
+  //
+  // The `global` location is not supported for batch translation.
+  //
+  // Only AutoML Translation models or glossaries within the same region (have
+  // the same location-id) can be used, otherwise an INVALID_ARGUMENT (400)
+  // error is returned.
+  string parent = 1 [
+    (google.api.field_behavior) = REQUIRED,
+    (google.api.resource_reference) = {
+      type: "locations.googleapis.com/Location"
+    }
+  ];
+
+  // Required. The BCP-47 language code of the input document if known, for
+  // example, "en-US" or "sr-Latn". Supported language codes are listed in
+  // Language Support (https://cloud.google.com/translate/docs/languages).
+  string source_language_code = 2 [(google.api.field_behavior) = REQUIRED];
+
+  // Required. The BCP-47 language code to use for translation of the input
+  // document. Specify up to 10 language codes here.
+  repeated string target_language_codes = 3
+      [(google.api.field_behavior) = REQUIRED];
+
+  // Required. Input configurations.
+  // The total number of files matched should be <= 100.
+  // The total content size to translate should be <= 100M Unicode codepoints.
+  // The files must use UTF-8 encoding.
+  repeated BatchDocumentInputConfig input_configs = 4
+      [(google.api.field_behavior) = REQUIRED];
+
+  // Required. Output configuration.
+  // If 2 input configs match to the same file (that is, same input path),
+  // we don't generate output for duplicate inputs.
+  BatchDocumentOutputConfig output_config = 5
+      [(google.api.field_behavior) = REQUIRED];
+
+  // Optional. The models to use for translation. Map's key is target language
+  // code. Map's value is the model name. Value can be a built-in general model,
+  // or an AutoML Translation model.
+  //
+  // The value format depends on model type:
+  //
+  // - AutoML Translation models:
+  //   `projects/{project-number-or-id}/locations/{location-id}/models/{model-id}`
+  //
+  // - General (built-in) models:
+  //   `projects/{project-number-or-id}/locations/{location-id}/models/general/nmt`,
+  //
+  //
+  // If the map is empty or a specific model is
+  // not requested for a language pair, then default google model (nmt) is used.
+  map<string, string> models = 6 [(google.api.field_behavior) = OPTIONAL];
+
+  // Optional. Glossaries to be applied. It's keyed by target language code.
+  map<string, TranslateTextGlossaryConfig> glossaries = 7
+      [(google.api.field_behavior) = OPTIONAL];
+
+  // Optional. File format conversion map to be applied to all input files.
+  // Map's key is the original mime_type. Map's value is the target mime_type of
+  // translated documents.
+  //
+  // Supported file format conversion includes:
+  // - `application/pdf` to
+  //   `application/vnd.openxmlformats-officedocument.wordprocessingml.document`
+  //
+  // If nothing specified, output files will be in the same format as the
+  // original file.
+  map<string, string> format_conversions = 8
+      [(google.api.field_behavior) = OPTIONAL];
+}
+
+// Input configuration for BatchTranslateDocument request.
+message BatchDocumentInputConfig {
+  // Specify the input.
+  oneof source {
+    // Google Cloud Storage location for the source input.
+    // This can be a single file (for example,
+    // `gs://translation-test/input.docx`) or a wildcard (for example,
+    // `gs://translation-test/*`).
+    //
+    // File mime type is determined based on extension. Supported mime type
+    // includes:
+    // - `pdf`, application/pdf
+    // - `docx`,
+    // application/vnd.openxmlformats-officedocument.wordprocessingml.document
+    // - `pptx`,
+    // application/vnd.openxmlformats-officedocument.presentationml.presentation
+    // - `xlsx`,
+    // application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
+    //
+    // The max file size to support for `.docx`, `.pptx` and `.xlsx` is 100MB.
+    // The max file size to support for `.pdf` is 1GB and the max page limit is
+    // 1000 pages.
+    // The max file size to support for all input documents is 1GB.
+    GcsSource gcs_source = 1;
+  }
+}
+
+// Output configuration for BatchTranslateDocument request.
+message BatchDocumentOutputConfig {
+  // The destination of output. The destination directory provided must exist
+  // and be empty.
+  oneof destination {
+    // Google Cloud Storage destination for output content.
+    // For every single input document (for example, gs://a/b/c.[extension]), we
+    // generate at most 2 * n output files. (n is the # of target_language_codes
+    // in the BatchTranslateDocumentRequest).
+    //
+    // While the input documents are being processed, we write/update an index
+    // file `index.csv` under `gcs_destination.output_uri_prefix` (for example,
+    // gs://translation_output/index.csv) The index file is generated/updated as
+    // new files are being translated. The format is:
+    //
+    // input_document,target_language_code,translation_output,error_output,
+    // glossary_translation_output,glossary_error_output
+    //
+    // `input_document` is one file we matched using gcs_source.input_uri.
+    // `target_language_code` is provided in the request.
+    // `translation_output` contains the translations. (details provided below)
+    // `error_output` contains the error message during processing of the file.
+    // Both translations_file and errors_file could be empty strings if we have
+    // no content to output.
+    // `glossary_translation_output` and `glossary_error_output` are the
+    // translated output/error when we apply glossaries. They could also be
+    // empty if we have no content to output.
+    //
+    // Once a row is present in index.csv, the input/output matching never
+    // changes. Callers should also expect all the content in input_file are
+    // processed and ready to be consumed (that is, no partial output file is
+    // written).
+    //
+    // Since index.csv will be keeping updated during the process, please make
+    // sure there is no custom retention policy applied on the output bucket
+    // that may avoid file updating.
+    // (https://cloud.google.com/storage/docs/bucket-lock?hl=en#retention-policy)
+    //
+    // The naming format of translation output files follows (for target
+    // language code [trg]): `translation_output`:
+    // gs://translation_output/a_b_c_[trg]_translation.[extension]
+    // `glossary_translation_output`:
+    // gs://translation_test/a_b_c_[trg]_glossary_translation.[extension] The
+    // output document will maintain the same file format as the input document.
+    //
+    // The naming format of error output files follows (for target language code
+    // [trg]): `error_output`: gs://translation_test/a_b_c_[trg]_errors.txt
+    // `glossary_error_output`:
+    // gs://translation_test/a_b_c_[trg]_glossary_translation.txt The error
+    // output is a txt file containing error details.
+    GcsDestination gcs_destination = 1;
+  }
+}
+
+// Stored in the
+// [google.longrunning.Operation.response][google.longrunning.Operation.response]
+// field returned by BatchTranslateDocument if at least one document is
+// translated successfully.
+message BatchTranslateDocumentResponse {
+  // Total number of pages to translate in all documents. Documents without
+  // clear page definition (such as XLSX) are not counted.
+  int64 total_pages = 1;
+
+  // Number of successfully translated pages in all documents. Documents without
+  // clear page definition (such as XLSX) are not counted.
+  int64 translated_pages = 2;
+
+  // Number of pages that failed to process in all documents. Documents without
+  // clear page definition (such as XLSX) are not counted.
+  int64 failed_pages = 3;
+
+  // Number of billable pages in documents with clear page definition (such as
+  // PDF, DOCX, PPTX)
+  int64 total_billable_pages = 4;
+
+  // Total number of characters (Unicode codepoints) in all documents.
+  int64 total_characters = 5;
+
+  // Number of successfully translated characters (Unicode codepoints) in all
+  // documents.
+  int64 translated_characters = 6;
+
+  // Number of characters that have failed to process (Unicode codepoints) in
+  // all documents.
+  int64 failed_characters = 7;
+
+  // Number of billable characters (Unicode codepoints) in documents without
+  // clear page definition, such as XLSX.
+  int64 total_billable_characters = 8;
+
+  // Time when the operation was submitted.
+  google.protobuf.Timestamp submit_time = 9;
+
+  // The time when the operation is finished and
+  // [google.longrunning.Operation.done][google.longrunning.Operation.done] is
+  // set to true.
+  google.protobuf.Timestamp end_time = 10;
+}
+
+// State metadata for the batch translation operation.
+message BatchTranslateDocumentMetadata {
+  // State of the job.
+  enum State {
+    // Invalid.
+    STATE_UNSPECIFIED = 0;
+
+    // Request is being processed.
+    RUNNING = 1;
+
+    // The batch is processed, and at least one item was successfully processed.
+    SUCCEEDED = 2;
+
+    // The batch is done and no item was successfully processed.
+    FAILED = 3;
+
+    // Request is in the process of being canceled after caller invoked
+    // longrunning.Operations.CancelOperation on the request id.
+    CANCELLING = 4;
+
+    // The batch is done after the user has called the
+    // longrunning.Operations.CancelOperation. Any records processed before the
+    // cancel command are output as specified in the request.
+    CANCELLED = 5;
+  }
+
+  // The state of the operation.
+  State state = 1;
+
+  // Total number of pages to translate in all documents so far. Documents
+  // without clear page definition (such as XLSX) are not counted.
+  int64 total_pages = 2;
+
+  // Number of successfully translated pages in all documents so far. Documents
+  // without clear page definition (such as XLSX) are not counted.
+  int64 translated_pages = 3;
+
+  // Number of pages that failed to process in all documents so far. Documents
+  // without clear page definition (such as XLSX) are not counted.
+  int64 failed_pages = 4;
+
+  // Number of billable pages in documents with clear page definition (such as
+  // PDF, DOCX, PPTX) so far.
+  int64 total_billable_pages = 5;
+
+  // Total number of characters (Unicode codepoints) in all documents so far.
+  int64 total_characters = 6;
+
+  // Number of successfully translated characters (Unicode codepoints) in all
+  // documents so far.
+  int64 translated_characters = 7;
+
+  // Number of characters that have failed to process (Unicode codepoints) in
+  // all documents so far.
+  int64 failed_characters = 8;
+
+  // Number of billable characters (Unicode codepoints) in documents without
+  // clear page definition (such as XLSX) so far.
+  int64 total_billable_characters = 9;
+
+  // Time when the operation was submitted.
+  google.protobuf.Timestamp submit_time = 10;
+}
diff --git a/google/cloud/translate/v3beta1/BUILD.bazel b/google/cloud/translate/v3beta1/BUILD.bazel
index 5250ad315..e46a2d103 100644
--- a/google/cloud/translate/v3beta1/BUILD.bazel
+++ b/google/cloud/translate/v3beta1/BUILD.bazel
@@ -29,6 +29,7 @@ proto_library(
         "//google/api:field_behavior_proto",
         "//google/api:resource_proto",
         "//google/longrunning:operations_proto",
+        "//google/rpc:status_proto",
         "@com_google_protobuf//:timestamp_proto",
     ],
 )
@@ -67,12 +68,18 @@ java_grpc_library(
 java_gapic_library(
     name = "translation_java_gapic",
     srcs = [":translation_proto_with_info"],
+    gapic_yaml = None,
     grpc_service_config = "translate_grpc_service_config.json",
+    service_yaml = "translate_v3beta1.yaml",
     test_deps = [
         ":translation_java_grpc",
+        "//google/cloud/location:location_java_grpc",
     ],
     deps = [
         ":translation_java_proto",
+        "//google/api:api_java_proto",
+        "//google/cloud/location:location_java_grpc",
+        "//google/cloud/location:location_java_proto",
     ],
 )
 
@@ -92,6 +99,9 @@ java_gapic_assembly_gradle_pkg(
         ":translation_java_grpc",
         ":translation_java_proto",
         ":translation_proto",
+        "//google/cloud/location:location_java_grpc",
+        "//google/cloud/location:location_java_proto",
+        "//google/cloud/location:location_proto",
     ],
 )
 
@@ -114,6 +124,7 @@ go_proto_library(
     deps = [
         "//google/api:annotations_go_proto",
         "//google/longrunning:longrunning_go_proto",
+        "//google/rpc:status_go_proto",
     ],
 )
 
@@ -126,6 +137,7 @@ go_gapic_library(
     service_yaml = "translate_v3beta1.yaml",
     deps = [
         ":translation_go_proto",
+        "//google/cloud/location:location_go_proto",
         "//google/longrunning:longrunning_go_proto",
         "@com_google_cloud_go//longrunning:go_default_library",
         "@com_google_cloud_go//longrunning/autogen:go_default_library",
@@ -270,9 +282,7 @@ ruby_grpc_library(
 ruby_cloud_gapic_library(
     name = "translation_ruby_gapic",
     srcs = [":translation_proto_with_info"],
-    extra_protoc_parameters = [
-        "ruby-cloud-gem-name=google-cloud-translation-v3beta1",
-    ],
+    extra_protoc_parameters = ["ruby-cloud-gem-name=google-cloud-translation-v3beta1"],
     grpc_service_config = "translate_grpc_service_config.json",
     deps = [
         ":translation_ruby_grpc",
diff --git a/google/cloud/translate/v3beta1/translation_service.proto b/google/cloud/translate/v3beta1/translation_service.proto
index 878af7962..03386518d 100644
--- a/google/cloud/translate/v3beta1/translation_service.proto
+++ b/google/cloud/translate/v3beta1/translation_service.proto
@@ -22,6 +22,7 @@ import "google/api/field_behavior.proto";
 import "google/api/resource.proto";
 import "google/longrunning/operations.proto";
 import "google/protobuf/timestamp.proto";
+import "google/rpc/status.proto";
 
 option cc_enable_arenas = true;
 option csharp_namespace = "Google.Cloud.Translate.V3Beta1";
@@ -1241,6 +1242,19 @@ message BatchTranslateDocumentRequest {
   // Optional. Glossaries to be applied. It's keyed by target language code.
   map<string, TranslateTextGlossaryConfig> glossaries = 7
       [(google.api.field_behavior) = OPTIONAL];
+
+  // Optional. File format conversion map to be applied to all input files.
+  // Map's key is the original mime_type. Map's value is the target mime_type of
+  // translated documents.
+  //
+  // Supported file format conversion includes:
+  // - `application/pdf` to
+  //   `application/vnd.openxmlformats-officedocument.wordprocessingml.document`
+  //
+  // If nothing specified, output files will be in the same format as the
+  // original file.
+  map<string, string> format_conversions = 8
+      [(google.api.field_behavior) = OPTIONAL];
 }
 
 // Input configuration for BatchTranslateDocument request.