Note:
This documentation is for version 2.3.0 of the library.
Some samples may not work with other versions.
Installation
Install the Google.Cloud.Translate.V3 package from NuGet. Add it to
your project in the normal way (for example by right-clicking on the
project in Visual Studio and choosing "Manage NuGet Packages...").
Authentication
When running on Google Cloud Platform, no action needs to be taken to authenticate.
Otherwise, the simplest way of authenticating your API calls is to
download a service account JSON file then set the GOOGLE_APPLICATION_CREDENTIALS environment variable to refer to it.
The credentials will automatically be used to authenticate. See the Getting Started With
Authentication guide for more details.
Create a client instance by calling the static Create or CreateAsync methods. Alternatively,
use the builder class associated with each client class (e.g. TranslationServiceClientBuilder for TranslationServiceClient)
as an easy way of specifying custom credentials, settings, or a custom endpoint. Clients are thread-safe,
and we recommend using a single instance across your entire application unless you have a particular need
to configure multiple client objects separately.
Sample code
TranslationServiceClient client = TranslationServiceClient.Create();
TranslateTextRequest request = new TranslateTextRequest
{
Contents = { "It is raining." },
TargetLanguageCode = "fr-FR",
Parent = new ProjectName(projectId).ToString()
};
TranslateTextResponse response = client.TranslateText(request);
// response.Translations will have one entry, because request.Contents has one entry.
Translation translation = response.Translations[0];
Console.WriteLine($"Detected language: {translation.DetectedLanguageCode}");
Console.WriteLine($"Translated text: {translation.TranslatedText}");
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[[["\u003cp\u003e\u003ccode\u003eGoogle.Cloud.Translate.V3\u003c/code\u003e is a .NET client library for the Google Cloud Translation API, with the current documentation focusing on version 2.3.0.\u003c/p\u003e\n"],["\u003cp\u003eThe library can be installed by adding the \u003ccode\u003eGoogle.Cloud.Translate.V3\u003c/code\u003e package from NuGet to your project.\u003c/p\u003e\n"],["\u003cp\u003eAuthentication on Google Cloud Platform is automatic, but elsewhere requires setting the \u003ccode\u003eGOOGLE_APPLICATION_CREDENTIALS\u003c/code\u003e environment variable to a service account JSON file.\u003c/p\u003e\n"],["\u003cp\u003eAll API operations are conducted through the \u003ccode\u003eTranslationServiceClient\u003c/code\u003e, which can be created via the \u003ccode\u003eCreate\u003c/code\u003e or \u003ccode\u003eCreateAsync\u003c/code\u003e methods and is thread-safe for use across an entire application.\u003c/p\u003e\n"],["\u003cp\u003eThe provided code sample showcases the basic usage of the TranslationServiceClient to translate text and display the detected language and the translated text.\u003c/p\u003e\n"]]],[],null,[]]
