This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

The Navigator.msSaveBlob() method saves the File or Blob to disk. This method behaves in the same way as Navigator.msSaveOrOpenBlob() except that this disables the file open option.


navigator.msSaveBlob(blob, defaultName);


A blob to be saved.

The file name to be used when saving file.

Return value

True is returned as long as the download notification bar is displayed, or false if a failure occured.


When a site calls this method, the behavior is the same as when Windows Internet Explorer downloads a file with the following in the header, where X-Download-Options removes the file open button from the browser file download dialog:

Content-Length: <blob.size>
Content-Type: <blob.type>
Content-Disposition: attachment;filename=<defaultName>
X-Download-Options: noopen


Not part of any specifications.

Browser compatibility

No compatibility data found. Please contribute data for "api.Navigator.msSaveBlob" (depth: 1) to the MDN compatibility data repository.