Uploading large files on OneDrive

To support the upload of larger files on OneDrive, a resumable upload method is necessary. This ensures that the whole file can be uploaded in pieces and easily resumed if the transfer is interrupted.

Complete these steps to upload large files on OneDrive.

  1. Create an upload session
  2. Upload fragments

This topic also covers how to:

Create an upload session

To begin a large file upload, you first create an upload session that will hold the contents of the file until it is committed.

POST /drive/root:/{path_to_item}:/createUploadSession
POST /drive/items/{parent_item_id}:/{filename}:/createUploadSession

Note: This method has a different signature for Microsoft Graph and OneDrive API. See OneDrive API endpoint differences for more information.

To start an upload session, POST a request to the path to the file or to the parent item's item ID and name of the file to be uploaded. No request body is required. Note: the parent folder must exist before you call createUploadSession.

To specify a non-default conflict behavior provide the item parameter in the request body with the appropriate value for the @microsoft.graph.conflictBehavior instance annotation.

POST /drive/root:/{item-path}:/createUploadSession
Content-Type: application/json

  "item": {
    "@microsoft.graph.conflictBehavior": "rename",
    "name": "largefile.dat"

Optional request headers

Name Value Description
if-match etag If this request header is included and the eTag (or cTag) provided does not match the current etag on the item, a 412 Precondition Failed errr response is returned.

The response to this request, if successful, will provide the details for where the remainder of the requests should be sent as an UploadSession resource. This resource provides details about where the next fragment should be uploaded and when the session expires.

HTTP/1.1 200 OK
Content-Type: application/json

  "uploadUrl": "https://sn3302.up.1drv.com/up/fe6987415ace7X4e1eF866337",
  "expirationDateTime": "2015-01-29T09:21:55.523Z",
  "nextExpectedRanges": ["0-"]

Upload fragments

To upload the file, or a portion of the file, make a PUT request to the uploadUrl received when the session was created. You can either upload the entire file in one fragment up to 60 MiB (60 * 1024 * 1024 bytes), or you can break the file into multiple fragments and upload each one separately. Fragments must be uploaded in order.

PUT https://sn3302.up.1drv.com/up/fe6987415ace7X4e1eF866337
Content-Length: 26
Content-Range: bytes 0-25/128

<bytes 0-25 of the file>

Important: Make sure that the total file size specified in the Content-Range header is the same for all file fragments uploaded. If a fragment declares a different size, the PUT request will fail.

When the request is complete, the server will respond with HTTP 202 Accepted if there are more fragments of the file that need to be uploaded.

HTTP/1.1 202 Accepted
Content-Type: application/json

  "expirationDateTime": "2015-01-29T09:21:55.523Z",

You can use the nextExpectedRanges value to determine where to start the next fragment. You may see multiple ranges specified, indicating parts of the file that the server has not yet received. This is especially useful if you need to resume a transfer that was interrupted and your client is unsure of the state on the service.

You should always determine the fragment size according to the best practices below. Do not assume that nextExpectedRanges will return reanges of proper size for an upload fragment. The nextExpectedRanges property indicates ranges of the file that have not been received and not a pattern for how you should upload the file.

HTTP/1.1 202 Accepted
Content-Type: application/json

  "expirationDateTime": "2015-01-29T09:21:55.523Z",
  "nextExpectedRanges": [


  • The nextExpectedRanges property won't always list all of the missing ranges.
  • On successful fragment writes, it will return the next range to start from (eg. "523-").
  • On failures when the client sent a fragment the server had already received, the server will respond with HTTP 416 Requested Range Not Satisfiable. You can request upload status to get a more detailed list of missing ranges.

When the last fragment is received and the server has all of the file's bytes, the server will respond with HTTP 201 Created (for a new file) or HTTP 200 OK for an updated file and include an driveItem resource for the uploaded file:

PUT https://sn3302.up.1drv.com/up/fe6987415ace7X4e1eF866337
Content-Length: 21
Content-Range: bytes 101-127/128

<final bytes of the file>
HTTP/1.1 201 Created
Content-Type: application/json

  "id": "912310013A123",
  "name": "largefile.vhd",
  "size": 128,
  "file": { }

Note: The item response is truncated for documentation clarity.

If a conflict occurs after the file is uploaded (for example, an item with the same name was created during the upload session), an error is returned when the last fragment is uploaded.

HTTP/1.1 409 Conflict
Content-Type: application/json

    "code": "upload_name_conflict",
    "message": "Another file exists with the same name as the uploaded session.
    You can redirect the upload session to use a new filename by calling PUT
    with the new metadata and @microsoft.graph.sourceUrl attribute.",

Cancel the upload session

To cancel an upload session (e.g. the user has aborted the upload), send a DELETE request to the upload URI.

DELETE https://sn3302.up.1drv.com/up/fe6987415ace7X4e1eF866337

The DELETE request will cause the existing upload session to expire, and remove any previously uploaded content for the file. The file will not appear in OneDrive. The service will respond with a 204 No Content upon success.

HTTP/1.1 204 No Content

Resume uploads

If an upload request gets terminated while it's in progress (for example, if a connection is dropped or the server responds with an HTTP 503 Service Unavailable), you should resume the upload from where you left off. To do this, you request the upload status, and then upload remaining data.

Request upload status

Query the status of the upload by sending a GET request to the uploadUrl.

GET https://sn3302.up.1drv.com/up/fe6987415ace7X4e1eF86633784148bb98a1zjcUhf7b0mpUadahs

Note: You can request the status of the file at any time, not just when the upload has failed.

The server will respond with a list of missing byte ranges that need to be uploaded. Note: this may not be the full list of missing ranges. As the upload progresses, more missing ranges will be returned.

HTTP/1.1 200 OK

  "expirationDateTime": "2015-01-29T09:21:55.523Z",
  "nextExpectedRanges": ["12345-"]

Upload remaining data

Now that your app knows where to start the upload from, resume the upload by following the steps in upload fragments of the file.

Handle commit errors

When the last fragment of a file is uploaded and OneDrive starts to commit the file to the user's drive, it is possible for an error to occur. This can be due to a name conflict or quota limitation being exceeded. OneDrive will preserve the upload session until the expiration time and allow your app to recover the upload by manually committing the upload session.

To manually commit the upload session, your app must make a PUT request with a new driveItem resource that will be used to commit the file. Inside the driveItem resource include an Instance Attribute for @microsoft.graph.sourceUrl with the value of your upload session URL.

PUT /drive/root:/{path_to_parent}
Content-Type: application/json
Content-Length: length
If-Match: {etag or ctag}

  "name": "largefile_2.vhd",
  "description": "A 5GB virtual disk",
  "@microsoft.graph.conflictBehavior": "rename",
  "@microsoft.graph.sourceUrl": "{upload session URL}"

Note: You can use the @microsoft.graph.conflictBehavior and if-match headers as expected in this call.

If the file can be committed using the new metadata, an HTTP 201 Created or HTTP 200 OK response will be returned with the Item metadata for the uploaded file.

Best practices

  • Resume or retry uploads that fail due to connection interruptions or any 5xx errors, including:
    • 500 Internal Server Error
    • 502 Bad Gateway
    • 503 Service Unavailable
    • 504 Gateway Timeout
  • Use an exponential back off strategy if any 5xx server errors are returned when resuming or retrying upload requests.
  • For other errors, you should not use an exponential back off strategy but limit the number of retry attempts made.
  • Handle 404 Not Found errors when doing resumable uploads by starting the entire upload over.
  • Use resumable file transfers for files larger than 10 MiB (10 * 1024 * 1024 bytes).
  • A fragment size of 10 MiB for stable high speed connections is optimal. For slower or less reliable connections you may get better results from a smaller fragment size. The recommended fragment size is between 5-10 MiB.
  • Use a fragment size that is a multiple of 320 KiB (320 * 1024 bytes). Failing to use a fragment size that is a multiple of 320 KiB can result in large file transfers failing after the last fragment is uploaded.

Error responses

See the Error Responses topic for details about how errors are returned.