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+---
+title: String.prototype.toUpperCase()
+slug: Web/JavaScript/Referencia/Objectes_globals/String/toUpperCase
+translation_of: Web/JavaScript/Reference/Global_Objects/String/toUpperCase
+---
+<div>{{JSRef}}</div>
+
+<p>El mètode <strong><code>toUpperCase()</code></strong> retorna  el valor del string que fa la crida convertit a majúscules.</p>
+
+<h2 id="Sintaxi">Sintaxi</h2>
+
+<pre class="syntaxbox"><code><var>str</var>.toUpperCase()</code></pre>
+
+<h2 id="Descripció">Descripció</h2>
+
+<p>El mètode <code>toUpperCase()</code> retorna  el valor del string que fa la crida convertit a majúscules. <code>toUpperCase()</code> no afecta el valor del string que fa la crida sino que en retorna un de nou.</p>
+
+<h2 id="Exemples">Exemples</h2>
+
+<h3 id="Utilitzar_toUpperCase()">Utilitzar <code>toUpperCase()</code></h3>
+
+<pre class="brush: js">console.log('alfabet'.toUpperCase()); // 'ALFABET'
+</pre>
+
+<h2 id="Especificacions">Especificacions</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Especificació</th>
+   <th scope="col">Estat</th>
+   <th scope="col">Comentaris</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES1')}}</td>
+   <td>{{Spec2('ES1')}}</td>
+   <td>Definició inicial. Implementat a JavaScript 1.0.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.5.4.18', 'String.prototype.toUpperCase')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-string.prototype.touppercase', 'String.prototype.toUpperCase')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilitat_amb_navegadors">Compatibilitat amb navegadors</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Característica</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Suport bàsic</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Característica</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Suport bàsic</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="Vegeu_també">Vegeu també</h2>
+
+<ul>
+ <li>{{jsxref("String.prototype.toLocaleLowerCase()")}}</li>
+ <li>{{jsxref("String.prototype.toLocaleUpperCase()")}}</li>
+ <li>{{jsxref("String.prototype.toLowerCase()")}}</li>
+</ul>