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+---
+title: File
+slug: Web/API/File
+translation_of: Web/API/File
+---
+<div>{{APIRef}}</div>
+
+<p>ONGOING The <strong><code>File</code></strong> interface provides information about files and allows JavaScript in a web page to access their content.</p>
+
+<p><code>File</code> objects are generally retrieved from a {{domxref("FileList")}} object returned as a result of a user selecting files using the {{HTMLElement("input")}} element, from a drag and drop operation's {{domxref("DataTransfer")}} object, or from the <code>mozGetAsFile()</code> API on an {{domxref("HTMLCanvasElement")}}. In Gecko, privileged code can create <code>File</code> objects representing any local file without user interaction (see {{anch("Implementation notes")}} for more information.)</p>
+
+<p>A <code>File</code> object is a specific kind of a {{domxref("Blob")}}, and can be used in any context that a Blob can. In particular, {{domxref("FileReader")}}, {{domxref("URL.createObjectURL()")}}, {{domxref("ImageBitmapFactories.createImageBitmap()", "createImageBitmap()")}}, and {{domxref("XMLHttpRequest", "", "send()")}} accept both <code>Blob</code>s and <code>File</code>s.</p>
+
+<p>See <a href="/en-US/docs/Using_files_from_web_applications">Using files from web applications</a> for more information and examples.</p>
+
+<p>{{InheritanceDiagram}}</p>
+
+<h2 id="Constructor">Constructor</h2>
+
+<dl>
+ <dt>{{domxref("File.File", "File()")}}</dt>
+ <dd>Returns a newly constructed <code>File</code>.</dd>
+</dl>
+
+<h2 id="Properties">Properties</h2>
+
+<dl>
+ <dt>{{domxref("File.lastModified")}} {{readonlyinline}}</dt>
+ <dd>Returns the last modified time of the file, in millisecond since the UNIX epoch (January 1st, 1970 at Midnight).</dd>
+ <dt>{{domxref("File.lastModifiedDate")}} {{readonlyinline}} {{deprecated_inline}} {{gecko_minversion_inline("15.0")}}</dt>
+ <dd>Returns the last modified <code><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date">Date</a></code> of the file referenced by the <code>File</code> object.</dd>
+ <dt>{{domxref("File.name")}} {{readonlyinline}}</dt>
+ <dd>Returns the name of the file referenced by the <code>File</code> object.</dd>
+ <dt>{{domxref("File.webkitRelativePath")}} {{readonlyinline}} {{non-standard_inline}}</dt>
+ <dd>Returns the path the URL of the {{domxref("File")}} is relative to.</dd>
+</dl>
+
+<p><code>File</code> implements {{domxref("Blob")}}, so it also has the following properties available to it:</p>
+
+<dl>
+ <dt>{{domxref("File.size")}} {{readonlyinline}}</dt>
+ <dd>Returns the size of the file.</dd>
+ <dt>{{domxref("File.type")}} {{readonlyinline}}</dt>
+ <dd>Returns the <a href="/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types">MIME </a>type of the file.</dd>
+</dl>
+
+<h2 id="Methods">Methods</h2>
+
+<p><em>The <code>File</code> interface doesn't define any methods, but inherits methods from the {{domxref("Blob")}} interface:</em></p>
+
+<dl>
+ <dt>{{domxref("Blob.slice()", "Blob.slice([start[, end[, contentType]]])")}}</dt>
+ <dd>Returns a new <code>Blob</code> object containing the data in the specified range of bytes of the source <code>Blob</code>.</dd>
+</dl>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('File API')}}</td>
+   <td>{{Spec2('File API')}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari (WebKit)</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>13</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop("1.9")}}<sup>[1]</sup><br>
+    {{CompatGeckoDesktop("7")}}</td>
+   <td>10.0</td>
+   <td>11.5</td>
+   <td>6.0</td>
+  </tr>
+  <tr>
+   <td><code>name</code></td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop("1.9.2")}}</td>
+   <td>11.0</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+  <tr>
+   <td><code>lastModifiedDate</code> {{deprecated_inline}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoDesktop("15")}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+  <tr>
+   <td><code>webkitRelativePath</code> {{non-standard_inline}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop("49")}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+  <tr>
+   <td>size</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>11.0</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Edge</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Phone</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoMobile("1.9")}}[1]<br>
+    {{CompatGeckoMobile("7")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>11.1</td>
+   <td>6.0</td>
+  </tr>
+  <tr>
+   <td><code>name</code></td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoMobile("1.9.2")}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+  <tr>
+   <td><code>lastModifiedData</code> {{deprecated_inline}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoMobile("15")}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+  <tr>
+   <td><code>webkitRelativePath</code> {{non-standard_inline}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoMobile("49")}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>
+    <p>{{CompatVersionUnknown}}</p>
+   </td>
+  </tr>
+  <tr>
+   <td>size</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] Non-standard implementation.</p>
+
+<h3 id="Implementation_notes">Implementation notes</h3>
+
+<ul>
+ <li>In Gecko, you can use this API from within chrome code. See <a href="/en-US/docs/Extensions/Using_the_DOM_File_API_in_chrome_code">Using the DOM File API in chrome code</a> for details. To use it from chrome code, JSM and Bootstrap scope, you have to import it using <code><a href="/en-US/docs/Components.utils.importGlobalProperties">Cu.importGlobalProperties</a>(['File']);</code></li>
+ <li>Starting from Gecko 6.0 {{geckoRelease("6.0")}}, privileged code (such as extensions) can pass an {{interface("nsIFile")}} object to the DOM <code>File</code> constructor to specify the file to reference.</li>
+ <li>Starting from Gecko 8.0 {{geckoRelease("8.0")}}, you can use <code>new File</code> to create <code>File</code> objects from XPCOM component code instead of having to instantiate the {{interface("nsIDOMFile")}} object directly. The constructor takes, in contrast to {{domxref("Blob")}}, as second argument the filename. The filename can be any String.
+  <pre class="syntaxbox">new File(
+  Array parts,
+  String filename,
+  BlobPropertyBag properties
+);</pre>
+ </li>
+ <li>The following non-standard properties and methods were removed in Gecko 7 {{geckoRelease("7.0")}}: {{domxref("File.fileName")}}, {{domxref("File.fileSize")}}, {{domxref("File.getAsBinary()")}}, {{domxref("File.getAsDataURL()")}}, {{domxref("File.getAsText()","File.getAsText(string encoding)")}} ({{bug("661876")}}). Standard properties {{domxref("File.name")}}, {{domxref("Blob.size")}}, and methods on {{domxref("FileReader")}} should be used instead.</li>
+</ul>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/API/File/Using_files_from_web_applications">Using files from web applications</a></li>
+ <li>{{domxref("FileReader")}}</li>
+ <li><a href="/en-US/docs/Extensions/Using_the_DOM_File_API_in_chrome_code">Using the DOM File API in chrome code</a> (for privileged code running in Gecko, such as Firefox add-ons)</li>
+</ul>