File

Baseline Widely available *

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨July 2015⁩.

* Some parts of this feature may have varying levels of support.

Note: This feature is available in Web Workers.

The File interface provides information about files and allows JavaScript in a web page to access their content.

File objects are generally retrieved from a FileList object returned as a result of a user selecting files using the <input> element, or from a drag and drop operation's DataTransfer object.

A File object is a specific kind of Blob, and can be used in any context that a Blob can. In particular, the following APIs accept both Blobs and File objects:

FileReader
URL.createObjectURL()
Window.createImageBitmap() and WorkerGlobalScope.createImageBitmap()
the body option to fetch()
XMLHttpRequest.send()

See Using files from web applications for more information and examples.

Constructor

File(): Returns a newly constructed File.

Instance properties

The File interface also inherits properties from the Blob interface.

File.lastModified Read only: Returns the last modified time of the file, in millisecond since the UNIX epoch (January 1st, 1970 at Midnight).
File.lastModifiedDate Deprecated Read only Non-standard: Returns the last modified Date of the file referenced by the File object.
File.name Read only: Returns the name of the file referenced by the File object.
File.webkitRelativePath Read only: Returns the path the URL of the File is relative to.