Download and export files

    The Google Drive API supports several types of download and export actions, as listed in the following table:

    Download actions
    Blob file content using the files.get method with the alt=media URL parameter.
    Blob file content at an earlier version using the revisions.get method with the alt=media URL parameter.
    Blob file content in a browser using the webContentLink field.
    Blob file content using the files.download method during long-running operations. This is the only way to download Google Vids files.
    Export actions
    Google Workspace document content in a format that your app can handle, using the files.export method.
    Google Workspace document content in a browser using the exportLinks field.
    Google Workspace document content at an earlier version in a browser using the exportLinks field.
    Google Workspace document content using the files.download method during long-running operations.

    Before you download or export file content, verify that users can download the file using the capabilities.canDownload field on the files resource.

    For descriptions of the file types mentioned here, including blob and Google Workspace files, see File types .

    The rest of this guide provides detailed instructions for performing these types of download and export actions.

    Download blob file content

    To download a blob file stored on Drive, use the files.get method with the ID of the file to download and the alt=media URL parameter. The alt=media URL parameter tells the server that a download of content is being requested as an alternative response format.

    The alt=media URL parameter is a system parameter available across all Google REST APIs. If you use a client library for the Drive API, you don't need to explicitly set this parameter.

    The following code sample shows how to use the files.get method to download a file with the Drive API client libraries.

    Java

    drive/snippets/drive_v3/src/main/java/DownloadFile.java
     import 
  
 com.google.api.client.googleapis.json.GoogleJsonResponseException 
 ; 
 import 
  
 com.google.api.client.http.HttpRequestInitializer 
 ; 
 import 
  
 com.google.api.client.http.javanet.NetHttpTransport 
 ; 
 import 
  
 com.google.api.client.json.gson.GsonFactory 
 ; 
 import 
  
 com.google.api.services.drive.Drive 
 ; 
 import 
  
 com.google.api.services.drive.DriveScopes 
 ; 
 import 
  
 com.google.auth.http.HttpCredentialsAdapter 
 ; 
 import 
  
 com.google.auth.oauth2.GoogleCredentials 
 ; 
 import 
  
 java.io.ByteArrayOutputStream 
 ; 
 import 
  
 java.io.IOException 
 ; 
 import 
  
 java.io.OutputStream 
 ; 
 import 
  
 java.util.Arrays 
 ; 
 /* Class to demonstrate use-case of drive's download file. */ 
 public 
  
 class 
 DownloadFile 
  
 { 
  
 /** 
 * Download a Document file in PDF format. 
 * 
 * @param realFileId file ID of any workspace document format file. 
 * @return byte array stream if successful, {@code null} otherwise. 
 * @throws IOException if service account credentials file not found. 
 */ 
  
 public 
  
 static 
  
 ByteArrayOutputStream 
  
 downloadFile 
 ( 
 String 
  
 realFileId 
 ) 
  
 throws 
  
 IOException 
  
 { 
  
 /* Load pre-authorized user credentials from the environment. 
 TODO(developer) - See https://developers.google.com/identity for 
 guides on implementing OAuth2 for your application.*/ 
  
 GoogleCredentials 
  
 credentials 
  
 = 
  
 GoogleCredentials 
 . 
 getApplicationDefault 
 () 
  
 . 
 createScoped 
 ( 
 Arrays 
 . 
 asList 
 ( 
 DriveScopes 
 . 
 DRIVE_FILE 
 )); 
  
 HttpRequestInitializer 
  
 requestInitializer 
  
 = 
  
 new 
  
 HttpCredentialsAdapter 
 ( 
  
 credentials 
 ); 
  
 // Build a new authorized API client service. 
  
 Drive 
  
 service 
  
 = 
  
 new 
  
 Drive 
 . 
 Builder 
 ( 
 new 
  
 NetHttpTransport 
 (), 
  
 GsonFactory 
 . 
 getDefaultInstance 
 (), 
  
 requestInitializer 
 ) 
  
 . 
 setApplicationName 
 ( 
 "Drive samples" 
 ) 
  
 . 
 build 
 (); 
  
 try 
  
 { 
  
 OutputStream 
  
 outputStream 
  
 = 
  
 new 
  
 ByteArrayOutputStream 
 (); 
  
 service 
 . 
 files 
 (). 
 get 
 ( 
 realFileId 
 ) 
  
 . 
 executeMediaAndDownloadTo 
 ( 
 outputStream 
 ); 
  
 return 
  
 ( 
 ByteArrayOutputStream 
 ) 
  
 outputStream 
 ; 
  
 } 
  
 catch 
  
 ( 
 GoogleJsonResponseException 
  
 e 
 ) 
  
 { 
  
 // TODO(developer) - handle error appropriately 
  
 System 
 . 
 err 
 . 
 println 
 ( 
 "Unable to move file: " 
  
 + 
  
 e 
 . 
 getDetails 
 ()); 
  
 throw 
  
 e 
 ; 
  
 } 
  
 } 
 }

    Python

    drive/snippets/drive-v3/file_snippet/download_file.py
     import 
  
 io 
 import 
  
 google.auth 
 from 
  
 googleapiclient.discovery 
  
 import 
 build 
 from 
  
 googleapiclient.errors 
  
 import 
 HttpError 
 from 
  
 googleapiclient.http 
  
 import 
 MediaIoBaseDownload 
 def 
  
 download_file 
 ( 
 real_file_id 
 ): 
  
 """Downloads a file 
 Args: 
 real_file_id: ID of the file to download 
 Returns : IO object with location. 
 Load pre-authorized user credentials from the environment. 
 TODO(developer) - See https://developers.google.com/identity 
 for guides on implementing OAuth2 for the application. 
 """ 
 creds 
 , 
 _ 
 = 
 google 
 . 
 auth 
 . 
 default 
 () 
 try 
 : 
 # create drive api client 
 service 
 = 
 build 
 ( 
 "drive" 
 , 
 "v3" 
 , 
 credentials 
 = 
 creds 
 ) 
 file_id 
 = 
 real_file_id 
 # pylint: disable=maybe-no-member 
 request 
 = 
 service 
 . 
 files 
 () 
 . 
 get_media 
 ( 
 fileId 
 = 
 file_id 
 ) 
 file 
 = 
 io 
 . 
 BytesIO 
 () 
 downloader 
 = 
 MediaIoBaseDownload 
 ( 
 file 
 , 
 request 
 ) 
 done 
 = 
 False 
 while 
 done 
 is 
 False 
 : 
 status 
 , 
 done 
 = 
 downloader 
 . 
 next_chunk 
 () 
 print 
 ( 
 f 
 "Download 
 { 
 int 
 ( 
 status 
 . 
 progress 
 () 
  
 * 
  
 100 
 ) 
 } 
 ." 
 ) 
 except 
 HttpError 
 as 
 error 
 : 
 print 
 ( 
 f 
 "An error occurred: 
 { 
 error 
 } 
 " 
 ) 
 file 
 = 
 None 
 return 
 file 
 . 
 getvalue 
 () 
 if 
 __name__ 
 == 
 "__main__" 
 : 
 download_file 
 ( 
 real_file_id 
 = 
 "1KuPmvGq8yoYgbfW74OENMCB5H0n_2Jm9" 
 )

    Node.js

    drive/snippets/drive_v3/file_snippets/download_file.js
     /** 
 * Downloads a file 
 * @param{string} realFileId file ID 
 * @return{obj} file status 
 * */ 
 async 
  
 function 
  
 downloadFile 
 ( 
 realFileId 
 ) 
  
 { 
  
 // Get credentials and build service 
  
 // TODO (developer) - Use appropriate auth mechanism for your app 
  
 const 
  
 { 
 GoogleAuth 
 } 
  
 = 
  
 require 
 ( 
 'google-auth-library' 
 ); 
  
 const 
  
 { 
 google 
 } 
  
 = 
  
 require 
 ( 
 'googleapis' 
 ); 
  
 const 
  
 auth 
  
 = 
  
 new 
  
 GoogleAuth 
 ({ 
  
 scopes 
 : 
  
 'https://www.googleapis.com/auth/drive' 
 , 
  
 }); 
  
 const 
  
 service 
  
 = 
  
 google 
 . 
 drive 
 ({ 
 version 
 : 
  
 'v3' 
 , 
  
 auth 
 }); 
  
 fileId 
  
 = 
  
 realFileId 
 ; 
  
 try 
  
 { 
  
 const 
  
 file 
  
 = 
  
 await 
  
 service 
 . 
 files 
 . 
 get 
 ({ 
  
 fileId 
 : 
  
 fileId 
 , 
  
 alt 
 : 
  
 'media' 
 , 
  
 }); 
  
 console 
 . 
 log 
 ( 
 file 
 . 
 status 
 ); 
  
 return 
  
 file 
 . 
 status 
 ; 
  
 } 
  
 catch 
  
 ( 
 err 
 ) 
  
 { 
  
 // TODO(developer) - Handle error 
  
 throw 
  
 err 
 ; 
  
 } 
 }

    PHP

    drive/snippets/drive_v3/src/DriveDownloadFile.php
    < ?php 
 use Google\Client; 
 use Google\Service\Drive; 
 function downloadFile() 
 { 
 try { 
 $client = new Client(); 
 $client->useApplicationDefaultCredentials(); 
 $client->addScope(Drive::DRIVE); 
 $driveService = new Drive($client); 
 $realFileId = readline("Enter File Id: "); 
 $fileId = '0BwwA4oUTeiV1UVNwOHItT0xfa2M'; 
 $fileId = $realFileId; 
 $response = $driveService->files->get($fileId, array( 
 'alt' => 'media')); 
 $content = $response->getBody()->getContents(); 
 return $content; 
 } catch(Exception $e) { 
 echo "Error Message: ".$e; 
 } 
 }

    .NET

    drive/snippets/drive_v3/DriveV3Snippets/DownloadFile.cs
     using 
  
 Google.Apis.Auth.OAuth2 
 ; 
 using 
  
 Google.Apis.Download 
 ; 
 using 
  
 Google.Apis.Drive.v3 
 ; 
 using 
  
 Google.Apis.Services 
 ; 
 namespace 
  
 DriveV3Snippets 
 { 
  
 // Class to demonstrate use-case of drive's download file. 
  
 public 
  
 class 
  
 DownloadFile 
  
 { 
  
 /// <summary> 
  
 /// Download a Document file in PDF format. 
  
 /// </summary> 
  
 /// <param name="fileId">file ID of any workspace document format file.</param> 
  
 /// <returns>byte array stream if successful, null otherwise.</returns> 
  
 public 
  
 static 
  
 MemoryStream 
  
 DriveDownloadFile 
 ( 
 string 
  
 fileId 
 ) 
  
 { 
  
 try 
  
 { 
  
 /* Load pre-authorized user credentials from the environment. 
 TODO(developer) - See https://developers.google.com/identity for 
 guides on implementing OAuth2 for your application. */ 
  
 GoogleCredential 
  
 credential 
  
 = 
  
 GoogleCredential 
  
 . 
 GetApplicationDefault 
 () 
  
 . 
 CreateScoped 
 ( 
 DriveService 
 . 
 Scope 
 . 
 Drive 
 ); 
  
 // Create Drive API service. 
  
 var 
  
 service 
  
 = 
  
 new 
  
 DriveService 
 ( 
 new 
  
 BaseClientService 
 . 
 Initializer 
  
 { 
  
 HttpClientInitializer 
  
 = 
  
 credential 
 , 
  
 ApplicationName 
  
 = 
  
 "Drive API Snippets" 
  
 }); 
  
 var 
  
 request 
  
 = 
  
 service 
 . 
 Files 
 . 
 Get 
 ( 
 fileId 
 ); 
  
 var 
  
 stream 
  
 = 
  
 new 
  
 MemoryStream 
 (); 
  
 // Add a handler which will be notified on progress changes. 
  
 // It will notify on each chunk download and when the 
  
 // download is completed or failed. 
  
 request 
 . 
 MediaDownloader 
 . 
 ProgressChanged 
  
 += 
  
 progress 
  
 = 
>  
 { 
  
 switch 
  
 ( 
 progress 
 . 
 Status 
 ) 
  
 { 
  
 case 
  
 DownloadStatus 
 . 
 Downloading 
 : 
  
 { 
  
 Console 
 . 
 WriteLine 
 ( 
 progress 
 . 
 BytesDownloaded 
 ); 
  
 break 
 ; 
  
 } 
  
 case 
  
 DownloadStatus 
 . 
 Completed 
 : 
  
 { 
  
 Console 
 . 
 WriteLine 
 ( 
 "Download complete." 
 ); 
  
 break 
 ; 
  
 } 
  
 case 
  
 DownloadStatus 
 . 
 Failed 
 : 
  
 { 
  
 Console 
 . 
 WriteLine 
 ( 
 "Download failed." 
 ); 
  
 break 
 ; 
  
 } 
  
 } 
  
 }; 
  
 request 
 . 
 Download 
 ( 
 stream 
 ); 
  
 return 
  
 stream 
 ; 
  
 } 
  
 catch 
  
 ( 
 Exception 
  
 e 
 ) 
  
 { 
  
 // TODO(developer) - handle error appropriately 
  
 if 
  
 ( 
 e 
  
 is 
  
 AggregateException 
 ) 
  
 { 
  
 Console 
 . 
 WriteLine 
 ( 
 "Credential Not found" 
 ); 
  
 } 
  
 else 
  
 { 
  
 throw 
 ; 
  
 } 
  
 } 
  
 return 
  
 null 
 ; 
  
 } 
  
 } 
 }

    This code sample uses a library method that adds the alt=media URL parameter to the underlying HTTP request.

    File downloads started from your app must be authorized with a scope that allows read access to the file content. For example, an app using the drive.readonly.metadata scope isn't authorized to download the file contents. This code sample uses the restricted “drive” file scope that allows users to view and manage all of your Drive files. To learn more about Drive scopes, refer to Choose Google Drive API scopes .

    Users with owner permissions (for my Drive files) or organizer permissions (for shared drive files) can restrict downloading through the DownloadRestrictionsMetadata object. For more information, see Prevent users from downloading, printing, or copying your file .

    Files identified as abusive (such as harmful software) are only downloadable by the file owner. Additionally, the get query parameter acknowledgeAbuse=true must be included to indicate that the user has acknowledged the risk of downloading potentially unwanted software or other abusive files. Your application should interactively warn the user before using this query parameter.

    Partial download

    Partial download involves downloading only a specified portion of a file. You can specify the portion of the file you want to download by using a byte range with the Range header. For example:

      Range 
 : 
  
 bytes 
 = 
 500 
 - 
 999

    Download blob file content at an earlier version

    You can only download blob file content revisions that are marked as "Keep Forever". If you want to download a revision, set it to "Keep Forever" first. For more information, see Specify revisions to save from auto delete .

    To download the content of blob files at an earlier version, use the revisions.get method with the ID of the file to download, the ID of the revision, and the alt=media URL parameter. The alt=media URL parameter tells the server that a download of content is being requested as an alternative response format. Similar to files.get , the revisions.get method also accepts the optional query parameter acknowledgeAbuse and the Range header. For more information, see Manage long-running operations .

    The request protocol is shown here.

    GET https://www.googleapis.com/drive/v3/files/{  FILE_ID 
 
}/revisions/{  REVISION_ID 
 
}?alt=media

    Download blob file content in a browser

    To download the content of blob files stored on Drive within a browser, instead of through the API, use the webContentLink field of the files resource. If the user has download access to the file, a link for downloading the file and its contents is returned. You can either redirect a user to this URL, or offer it as a clickable link.

    Download blob file content during long-running operations

    To download the content of blob files during long-running operations, use the files.download method with the ID of the file to download. You can optionally set the ID of the revision. This is the only way to download Google Vids files. For more information, see Manage long-running operations .

    Export Google Workspace document content

    To export Google Workspace document byte content, use the files.export method with the ID of the file to export and the correct MIME type . Exported content is limited to 10 MB.

    The following code sample shows how to use the files.export method to export a Google Workspace document in PDF format using the Drive API client libraries:

    Java

    drive/snippets/drive_v3/src/main/java/ExportPdf.java
     import 
  
 com.google.api.client.googleapis.json.GoogleJsonResponseException 
 ; 
 import 
  
 com.google.api.client.http.HttpRequestInitializer 
 ; 
 import 
  
 com.google.api.client.http.javanet.NetHttpTransport 
 ; 
 import 
  
 com.google.api.client.json.gson.GsonFactory 
 ; 
 import 
  
 com.google.api.services.drive.Drive 
 ; 
 import 
  
 com.google.api.services.drive.DriveScopes 
 ; 
 import 
  
 com.google.auth.http.HttpCredentialsAdapter 
 ; 
 import 
  
 com.google.auth.oauth2.GoogleCredentials 
 ; 
 import 
  
 java.io.ByteArrayOutputStream 
 ; 
 import 
  
 java.io.IOException 
 ; 
 import 
  
 java.io.OutputStream 
 ; 
 import 
  
 java.util.Arrays 
 ; 
 /* Class to demonstrate use-case of drive's export pdf. */ 
 public 
  
 class 
 ExportPdf 
  
 { 
  
 /** 
 * Download a Document file in PDF format. 
 * 
 * @param realFileId file ID of any workspace document format file. 
 * @return byte array stream if successful, {@code null} otherwise. 
 * @throws IOException if service account credentials file not found. 
 */ 
  
 public 
  
 static 
  
 ByteArrayOutputStream 
  
 exportPdf 
 ( 
 String 
  
 realFileId 
 ) 
  
 throws 
  
 IOException 
  
 { 
  
 // Load pre-authorized user credentials from the environment. 
  
 // TODO(developer) - See https://developers.google.com/identity for 
  
 // guides on implementing OAuth2 for your application. 
  
 GoogleCredentials 
  
 credentials 
  
 = 
  
 GoogleCredentials 
 . 
 getApplicationDefault 
 () 
  
 . 
 createScoped 
 ( 
 Arrays 
 . 
 asList 
 ( 
 DriveScopes 
 . 
 DRIVE_FILE 
 )); 
  
 HttpRequestInitializer 
  
 requestInitializer 
  
 = 
  
 new 
  
 HttpCredentialsAdapter 
 ( 
  
 credentials 
 ); 
  
 // Build a new authorized API client service. 
  
 Drive 
  
 service 
  
 = 
  
 new 
  
 Drive 
 . 
 Builder 
 ( 
 new 
  
 NetHttpTransport 
 (), 
  
 GsonFactory 
 . 
 getDefaultInstance 
 (), 
  
 requestInitializer 
 ) 
  
 . 
 setApplicationName 
 ( 
 "Drive samples" 
 ) 
  
 . 
 build 
 (); 
  
 OutputStream 
  
 outputStream 
  
 = 
  
 new 
  
 ByteArrayOutputStream 
 (); 
  
 try 
  
 { 
  
 service 
 . 
 files 
 (). 
 export 
 ( 
 realFileId 
 , 
  
 "application/pdf" 
 ) 
  
 . 
 executeMediaAndDownloadTo 
 ( 
 outputStream 
 ); 
  
 return 
  
 ( 
 ByteArrayOutputStream 
 ) 
  
 outputStream 
 ; 
  
 } 
  
 catch 
  
 ( 
 GoogleJsonResponseException 
  
 e 
 ) 
  
 { 
  
 // TODO(developer) - handle error appropriately 
  
 System 
 . 
 err 
 . 
 println 
 ( 
 "Unable to export file: " 
  
 + 
  
 e 
 . 
 getDetails 
 ()); 
  
 throw 
  
 e 
 ; 
  
 } 
  
 } 
 }

    Python

    drive/snippets/drive-v3/file_snippet/export_pdf.py
     import 
  
 io 
 import 
  
 google.auth 
 from 
  
 googleapiclient.discovery 
  
 import 
 build 
 from 
  
 googleapiclient.errors 
  
 import 
 HttpError 
 from 
  
 googleapiclient.http 
  
 import 
 MediaIoBaseDownload 
 def 
  
 export_pdf 
 ( 
 real_file_id 
 ): 
  
 """Download a Document file in PDF format. 
 Args: 
 real_file_id : file ID of any workspace document format file 
 Returns : IO object with location 
 Load pre-authorized user credentials from the environment. 
 TODO(developer) - See https://developers.google.com/identity 
 for guides on implementing OAuth2 for the application. 
 """ 
 creds 
 , 
 _ 
 = 
 google 
 . 
 auth 
 . 
 default 
 () 
 try 
 : 
 # create drive api client 
 service 
 = 
 build 
 ( 
 "drive" 
 , 
 "v3" 
 , 
 credentials 
 = 
 creds 
 ) 
 file_id 
 = 
 real_file_id 
 # pylint: disable=maybe-no-member 
 request 
 = 
 service 
 . 
 files 
 () 
 . 
 export_media 
 ( 
 fileId 
 = 
 file_id 
 , 
 mimeType 
 = 
 "application/pdf" 
 ) 
 file 
 = 
 io 
 . 
 BytesIO 
 () 
 downloader 
 = 
 MediaIoBaseDownload 
 ( 
 file 
 , 
 request 
 ) 
 done 
 = 
 False 
 while 
 done 
 is 
 False 
 : 
 status 
 , 
 done 
 = 
 downloader 
 . 
 next_chunk 
 () 
 print 
 ( 
 f 
 "Download 
 { 
 int 
 ( 
 status 
 . 
 progress 
 () 
  
 * 
  
 100 
 ) 
 } 
 ." 
 ) 
 except 
 HttpError 
 as 
 error 
 : 
 print 
 ( 
 f 
 "An error occurred: 
 { 
 error 
 } 
 " 
 ) 
 file 
 = 
 None 
 return 
 file 
 . 
 getvalue 
 () 
 if 
 __name__ 
 == 
 "__main__" 
 : 
 export_pdf 
 ( 
 real_file_id 
 = 
 "1zbp8wAyuImX91Jt9mI-CAX_1TqkBLDEDcr2WeXBbKUY" 
 )

    Node.js

    drive/snippets/drive_v3/file_snippets/export_pdf.js
     /** 
 * Download a Document file in PDF format 
 * @param{string} fileId file ID 
 * @return{obj} file status 
 * */ 
 async 
  
 function 
  
 exportPdf 
 ( 
 fileId 
 ) 
  
 { 
  
 const 
  
 { 
 GoogleAuth 
 } 
  
 = 
  
 require 
 ( 
 'google-auth-library' 
 ); 
  
 const 
  
 { 
 google 
 } 
  
 = 
  
 require 
 ( 
 'googleapis' 
 ); 
  
 // Get credentials and build service 
  
 // TODO (developer) - Use appropriate auth mechanism for your app 
  
 const 
  
 auth 
  
 = 
  
 new 
  
 GoogleAuth 
 ({ 
  
 scopes 
 : 
  
 'https://www.googleapis.com/auth/drive' 
 , 
  
 }); 
  
 const 
  
 service 
  
 = 
  
 google 
 . 
 drive 
 ({ 
 version 
 : 
  
 'v3' 
 , 
  
 auth 
 }); 
  
 try 
  
 { 
  
 const 
  
 result 
  
 = 
  
 await 
  
 service 
 . 
 files 
 . 
 export 
 ({ 
  
 fileId 
 : 
  
 fileId 
 , 
  
 mimeType 
 : 
  
 'application/pdf' 
 , 
  
 }); 
  
 console 
 . 
 log 
 ( 
 result 
 . 
 status 
 ); 
  
 return 
  
 result 
 ; 
  
 } 
  
 catch 
  
 ( 
 err 
 ) 
  
 { 
  
 // TODO(developer) - Handle error 
  
 throw 
  
 err 
 ; 
  
 } 
 }

    PHP

    drive/snippets/drive_v3/src/DriveExportPdf.php
    < ?php 
 use Google\Client; 
 use Google\Service\Drive; 
 function exportPdf() 
 { 
 try { 
 $client = new Client(); 
 $client->useApplicationDefaultCredentials(); 
 $client->addScope(Drive::DRIVE); 
 $driveService = new Drive($client); 
 $realFileId = readline("Enter File Id: "); 
 $fileId = '1ZdR3L3qP4Bkq8noWLJHSr_iBau0DNT4Kli4SxNc2YEo'; 
 $fileId = $realFileId; 
 $response = $driveService->files->export($fileId, 'application/pdf', array( 
 'alt' => 'media')); 
 $content = $response->getBody()->getContents(); 
 return $content; 
 }  catch(Exception $e) { 
 echo "Error Message: ".$e; 
 } 
 }

    .NET

    drive/snippets/drive_v3/DriveV3Snippets/ExportPdf.cs
     using 
  
 Google.Apis.Auth.OAuth2 
 ; 
 using 
  
 Google.Apis.Download 
 ; 
 using 
  
 Google.Apis.Drive.v3 
 ; 
 using 
  
 Google.Apis.Services 
 ; 
 namespace 
  
 DriveV3Snippets 
 { 
  
 // Class to demonstrate use of Drive export pdf 
  
 public 
  
 class 
  
 ExportPdf 
  
 { 
  
 /// <summary> 
  
 /// Download a Document file in PDF format. 
  
 /// </summary> 
  
 /// <param name="fileId">Id of the file.</param> 
  
 /// <returns>Byte array stream if successful, null otherwise</returns> 
  
 public 
  
 static 
  
 MemoryStream 
  
 DriveExportPdf 
 ( 
 string 
  
 fileId 
 ) 
  
 { 
  
 try 
  
 { 
  
 /* Load pre-authorized user credentials from the environment. 
 TODO(developer) - See https://developers.google.com/identity for 
 guides on implementing OAuth2 for your application. */ 
  
 GoogleCredential 
  
 credential 
  
 = 
  
 GoogleCredential 
 . 
 GetApplicationDefault 
 () 
  
 . 
 CreateScoped 
 ( 
 DriveService 
 . 
 Scope 
 . 
 Drive 
 ); 
  
 // Create Drive API service. 
  
 var 
  
 service 
  
 = 
  
 new 
  
 DriveService 
 ( 
 new 
  
 BaseClientService 
 . 
 Initializer 
  
 { 
  
 HttpClientInitializer 
  
 = 
  
 credential 
 , 
  
 ApplicationName 
  
 = 
  
 "Drive API Snippets" 
  
 }); 
  
 var 
  
 request 
  
 = 
  
 service 
 . 
 Files 
 . 
 Export 
 ( 
 fileId 
 , 
  
 "application/pdf" 
 ); 
  
 var 
  
 stream 
  
 = 
  
 new 
  
 MemoryStream 
 (); 
  
 // Add a handler which will be notified on progress changes. 
  
 // It will notify on each chunk download and when the 
  
 // download is completed or failed. 
  
 request 
 . 
 MediaDownloader 
 . 
 ProgressChanged 
  
 += 
  
 progress 
  
 = 
>  
 { 
  
 switch 
  
 ( 
 progress 
 . 
 Status 
 ) 
  
 { 
  
 case 
  
 DownloadStatus 
 . 
 Downloading 
 : 
  
 { 
  
 Console 
 . 
 WriteLine 
 ( 
 progress 
 . 
 BytesDownloaded 
 ); 
  
 break 
 ; 
  
 } 
  
 case 
  
 DownloadStatus 
 . 
 Completed 
 : 
  
 { 
  
 Console 
 . 
 WriteLine 
 ( 
 "Download complete." 
 ); 
  
 break 
 ; 
  
 } 
  
 case 
  
 DownloadStatus 
 . 
 Failed 
 : 
  
 { 
  
 Console 
 . 
 WriteLine 
 ( 
 "Download failed." 
 ); 
  
 break 
 ; 
  
 } 
  
 } 
  
 }; 
  
 request 
 . 
 Download 
 ( 
 stream 
 ); 
  
 return 
  
 stream 
 ; 
  
 } 
  
 catch 
  
 ( 
 Exception 
  
 e 
 ) 
  
 { 
  
 // TODO(developer) - handle error appropriately 
  
 if 
  
 ( 
 e 
  
 is 
  
 AggregateException 
 ) 
  
 { 
  
 Console 
 . 
 WriteLine 
 ( 
 "Credential Not found" 
 ); 
  
 } 
  
 else 
  
 { 
  
 throw 
 ; 
  
 } 
  
 } 
  
 return 
  
 null 
 ; 
  
 } 
  
 } 
 }

    This code sample uses the restricted drive scope that allows users to view and manage all of your Drive files. To learn more about Drive scopes, refer to Choose Google Drive API scopes .

    The code sample also declares the export MIME type as application/pdf . For a complete list of all export MIME types supported for each Google Workspace document, refer to Export MIME types for Google Workspace documents .

    Export Google Workspace document content in a browser

    To export Google Workspace document content within a browser, use the exportLinks field of the files resource. Depending on the document type, a link to download the file and its contents is returned for every MIME type available. You can either redirect a user to a URL, or offer it as a clickable link.

    Export Google Workspace document content at an earlier version in a browser

    To export Google Workspace document content at an earlier version within a browser, use the revisions.get method with the ID of the file to download and the ID of the revision to generate an export link from which you can perform the download. If the user has download access to the file, a link for downloading the file and its contents is returned. You can either redirect a user to this URL, or offer it as a clickable link.

    Export Google Workspace document content during long-running operations

    To export Google Workspace document content during long-running operations, use the files.download method with the ID of the file to download and the ID of the revision. For more information, see Manage long-running operations .

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