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+---
+title: FileReader.readAsDataURL()
+slug: Web/API/FileReader/readAsDataURL
+tags:
+  - API
+  - File API
+  - Files
+  - Image Preview
+  - Method
+translation_of: Web/API/FileReader/readAsDataURL
+---
+<p>{{APIRef("File API")}}</p>
+
+<p>O método <code>readAsDataURL é usado para ler o conteúdo do tipo </code>{{domxref("Blob")}} ou {{domxref("File")}}.<br>
+ Quando a operação de leitura acaba, a flag {{domxref("FileReader.readyState","readyState")}} muda para <strong>DONE</strong> e o evento {{event("loadend")}} é disparado.<br>
+ Então o atributo {{domxref("FileReader.result","result")}} irá conter a URL codificada em base64 do arquivo.</p>
+
+<h2 id="Sintaxe">Sintaxe</h2>
+
+<pre><em>instanceOfFileReader</em>.readAsDataURL(blob);</pre>
+
+<h3 id="Parametros">Parametros</h3>
+
+<dl>
+ <dt><code>blob</code></dt>
+ <dd>O conteúdo do tipo {{domxref("Blob")}} ou {{domxref("File")}} que queremos ler.</dd>
+</dl>
+
+<h2 id="Exemplo">Exemplo</h2>
+
+<h3 id="HTML">HTML</h3>
+
+<pre class="syntaxbox">&lt;input type="file" onchange="previewFile()"&gt;&lt;br&gt;
+&lt;img src="" height="200" alt="Prévia da imagem..."&gt;</pre>
+
+<h3 id="JavaScript">JavaScript</h3>
+
+<pre class="syntaxbox">function previewFile() {
+  var preview = document.querySelector('img');
+  var file    = document.querySelector('input[type=file]').files[0];
+  var reader  = new FileReader();
+
+  reader.onloadend = function () {
+    preview.src = reader.result;
+  }
+
+  if (file) {
+    reader.readAsDataURL(file);
+  } else {
+    preview.src = "";
+  }
+}</pre>
+
+<h3 id="Demo">Demo</h3>
+
+<p>{{EmbedLiveSample("Example", "100%", 240)}}</p>
+
+<h2 id="Exemplo_de_leitura_com_múltiplos_arquivos">Exemplo de leitura com múltiplos arquivos</h2>
+
+<h4 id="HTML_2"><strong>HTML</strong></h4>
+
+<pre class="syntaxbox"><code>&lt;input id="browse" type="file" onchange="previewFiles()" multiple&gt;
+&lt;div id="preview"&gt;&lt;/div&gt;</code></pre>
+
+<h4 id="JavaScript_2">JavaScript</h4>
+
+<pre class="syntaxbox"><code>function previewFiles() {
+
+  var preview = document.querySelector('#preview');
+  var files   = document.querySelector('input[type=file]').files;
+
+  function readAndPreview(file) {
+
+    // Make sure `file.name` matches our extensions criteria
+    if ( /\.(jpe?g|png|gif)$/i.test(file.name) ) {
+      var reader = new FileReader();
+
+      reader.addEventListener("load", function () {
+        var image = new Image();
+        image.height = 100;
+        image.title = file.name;
+        image.src = this.result;
+        preview.appendChild( image );
+      }, false);
+
+      reader.readAsDataURL(file);
+    }
+
+  }
+
+  if (files) {
+    [].forEach.call(files, readAndPreview);
+  }
+
+}</code></pre>
+
+<div class="note"><strong>Nota:</strong> O construtor do <a href="/en-US/docs/Web/API/FileReader"><code>FileReader()</code></a> não é suportado  por versões anteriores à 10 do Internet Explorer. Para uma maior compatibilidade você pode ver os exemplos <a class="internal" href="https://mdn.mozillademos.org/files/3699/crossbrowser_image_preview.html" title="crossbrowser_image_preview.html">prévia de imagem básica</a> ou <a href="https://mdn.mozillademos.org/files/3698/image_upload_preview.html">prévia de imagem avançada</a>.</div>
+
+<h2 id="Browser_Compatibility" name="Browser_Compatibility">Especificações</h2>
+
+<p>{{page("/pt-BR/docs/Web/API/FileReader","Specifications")}}</p>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">Compatibilidade</h2>
+
+<p>{{page("/pt-BR/docs/Web/API/FileReader","Browser compatibility")}}</p>
+
+<h2 id="Veja_também">Veja também</h2>
+
+<ul>
+ <li>{{domxref("FileReader")}}</li>
+</ul>