GroupDocs.Viewer Cloud is an enterprise-grade REST API for high-fidelity document viewing and rendering. Integrate preview of Word, Excel, PowerPoint, PDF, CAD, Visio, email, images, and more into web, mobile, or desktop applications with no third-party software — render to HTML, image, or PDF.

SDKs are grouped by platform. Each example converts and downloads a document (Word → JPG) using the Convert and download document API — no cloud storage required. The same call is shown first as plain REST (cURL), then for each SDK.

Call the Viewer Cloud REST API directly (no SDK). Obtain a JWT from the token endpoint (client_credentials), then convert and download:

# Get JWT (Client Id / Client Secret from https://dashboard.groupdocs.cloud)
curl -v "https://api.groupdocs.cloud/connect/token" \
-X POST \
-d "grant_type=client_credentials&client_id=$CLIENT_ID&client_secret=$CLIENT_SECRET" \
-H "Content-Type: application/x-www-form-urlencoded" \
-H "Accept: application/json"# Convert and download (Word → JPG; format is a required query parameter)
curl -v "https://api.groupdocs.cloud/v2.0/viewer/convertAndDownload?format=jpg" \
-X PUT \
-H "Content-Type: multipart/form-data" \
-H "Accept: application/json" \
-H "Authorization: Bearer $JWT_TOKEN" \
--data-binary "@sample.docx"

See more: Convert and download document (cURL example).

.NET SDK for GroupDocs.Viewer Cloud — .NET Core and .NET Framework.

• groupdocs-viewer-cloud-dotnet — SDK
• groupdocs-viewer-cloud-dotnet-samples — Examples

varconfiguration=newConfiguration(MyClientId,MyClientSecret);varapiInstance=newViewApi(configuration);varrequest=newConvertAndDownloadRequest("jpg",File.OpenRead("sample.docx"));varresult=apiInstance.ConvertAndDownload(request);

Java SDK for the GroupDocs.Viewer Cloud REST API.

• groupdocs-viewer-cloud-java — SDK
• groupdocs-viewer-cloud-java-samples — Examples

Configurationconfiguration = newConfiguration(MyClientId, MyClientSecret);
ViewApiapiInstance = newViewApi(configuration);
ConvertAndDownloadRequestrequest = newConvertAndDownloadRequest("jpg", newFile("sample.docx"), null, null);
Fileresult = apiInstance.convertAndDownload(request);

PHP SDK for the GroupDocs.Viewer Cloud REST API.

• groupdocs-viewer-cloud-php — SDK
• groupdocs-viewer-cloud-php-samples — Examples

useGroupDocs\Viewer\Model\Requests;
$configuration = newGroupDocs\Viewer\Configuration();
$configuration->setAppSid($ClientId);
$configuration->setAppKey($ClientSecret);
$apiInstance = newGroupDocs\Viewer\ViewApi($configuration);
$request = newRequests\convertAndDownloadRequest("jpg", "sample.docx");
$result = $apiInstance->convertAndDownload($request);

Node.js SDK for the GroupDocs.Viewer Cloud REST API.

• groupdocs-viewer-cloud-node — SDK
• groupdocs-viewer-cloud-node-samples — Examples

constfs=require("fs");constviewer_cloud=require("groupdocs-viewer-cloud");constviewApi=viewer_cloud.ViewApi.fromKeys(clientId,clientSecret);letfilebuf=fs.readFileSync("sample.docx");letrequest=newviewer_cloud.ConvertAndDownloadRequest("jpg",filebuf);letresult=awaitviewApi.convertAndDownload(request);

Python SDK for the GroupDocs.Viewer Cloud REST API.

• groupdocs-viewer-cloud-python — SDK
• groupdocs-viewer-cloud-python-samples — Examples

importgroupdocs_viewer_cloudapi_instance=groupdocs_viewer_cloud.ViewApi.from_keys(client_id, client_secret)
withopen("sample.docx", "rb") asfile:
request=groupdocs_viewer_cloud.ConvertAndDownloadRequest("jpg", file)
result=api_instance.convert_and_download(request)

Ruby SDK for the GroupDocs.Viewer Cloud REST API.

• groupdocs-viewer-cloud-ruby — SDK
• groupdocs-viewer-cloud-ruby-samples — Examples

require'groupdocs_viewer_cloud'api_instance=GroupDocsViewerCloud::ViewApi.from_keys($client_id, $client_secret)file=File.open("sample.docx","r")request=GroupDocsViewerCloud::ConvertAndDownloadRequest.new("jpg",file)result=api_instance.convert_and_download(request)

Go SDK for the GroupDocs.Viewer Cloud REST API.

• groupdocs-viewer-cloud-go — SDK
• groupdocs-viewer-cloud-go-samples — Examples

file, err:=os.Open("sample.docx")
iferr!=nil {
return
}
deferfile.Close()
result, _, err:=config.Client.ViewApi.ConvertAndDownload(config.Ctx, "jpg", file, nil)

• In-app document preview — Render Office, PDF, and images to HTML or JPG for browser and mobile viewers.
• Secure PDF delivery — Produce password-protected or permission-locked PDF previews for portals and sharing.
• CAD & engineering review — View drawings and layouts without desktop CAD software.
• Email & archive browsing — Preview MSG/EML, PST folders, and ZIP contents in web UIs.
• Serverless rendering — Call convert-and-download from AWS Lambda or Azure Functions with no intermediate storage.

Use Client ID and Client Secret from GroupDocs Cloud Dashboard to authenticate. Set them in your SDK configuration (e.g. Configuration, from_keys, or environment variables) before calling the API.

document-viewerdocument-preview-apipdf-viewerword-viewerexcel-viewerpowerpoint-viewerhtml-viewerimage-viewercad-vieweremail-viewervisio-viewercloud-document-viewerrender-to-htmlrender-to-jpgrender-to-pdfconvert-and-downloadviewer-sdkgroupdocs-viewer-cloud