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href="/web/20210310120011/https://flutter.dev/docs/development/tools/android-studio">Android Studio & IntelliJ</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210310120011/https://flutter.dev/docs/development/tools/vs-code">Visual Studio Code</a> </li><li class="nav-item"> <a class="nav-link collapsable collapsed" data-toggle="collapse" data-target="#sidenav-3-7-3" href="/web/20210310120011/https://flutter.dev/docs/development/tools/devtools" role="button" aria-expanded="false" aria-controls="sidenav-3-7-3">DevTools </a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-3-7-3"> <li class="nav-item"> <a class="nav-link" href="/web/20210310120011/https://flutter.dev/docs/development/tools/devtools/overview">Overview</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210310120011/https://flutter.dev/docs/development/tools/devtools/android-studio">Install from Android Studio & IntelliJ</a> </li> <li class="nav-item"> <a class="nav-link" 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col-12 col-md-9 offset-md-3 col-xl-8 offset-xl-2 col-xxl-8 offset-xxl-2" role="main"> <div class="container"> <header class="site-content__title"> <div id="page-github-links" class="btn-group" aria-label="Page GitHub links" role="group"> <a href="https://web.archive.org/web/20210310120011/https://github.com/flutter/website/tree/master/src/docs/development/tools/web-renderers.md" class="btn no-automatic-external" title="View page source" target="_blank" rel="noopener"> <i class="fas fa-file-alt fa-sm"></i> </a> <a href="https://web.archive.org/web/20210310120011/https://github.com/flutter/website/issues/new?title='Web renderers' page issue&body=Page URL: https://flutter.dev/docs/development/tools/web-renderers.html%0D%0APage source: https://github.com/flutter/website/tree/master/src/docs/development/tools/web-renderers.md%0D%0A%0D%0AFound a typo? You can fix it yourself by going to the page source and clicking the pencil icon. Or finish creating this issue.%0D%0A%0D%0ADescription of issue:" class="btn no-automatic-external" title="Report an issue with this page" target="_blank" rel="noopener"> <i class="fas fa-bug fa-sm"></i> </a> </div> <h1>Web renderers</h1> <nav aria-label="breadcrumb"> <ol class="breadcrumb" vocab="http://schema.org/" typeof="BreadcrumbList"> <li class="breadcrumb-item" property="itemListElement" typeof="ListItem"><a href="/web/20210310120011/https://flutter.dev/docs" property="item" typeof="WebPage"><span property="name">Docs</span> </a> <meta property="position" content="1"/> </li> <li class="breadcrumb-item" property="itemListElement" typeof="ListItem"><a href="/web/20210310120011/https://flutter.dev/docs/development" property="item" typeof="WebPage"><span property="name">Development</span> </a> <meta property="position" content="2"/> </li> <li class="breadcrumb-item" property="itemListElement" typeof="ListItem"><a href="/web/20210310120011/https://flutter.dev/docs/development/tools" property="item" typeof="WebPage"><span property="name">Tools</span> </a> <meta property="position" content="3"/> </li> <li class="breadcrumb-item active" property="itemListElement" typeof="ListItem" aria-current="page"><a href="/web/20210310120011/https://flutter.dev/docs/development/tools/web-renderers.html" property="item" typeof="WebPage"><span property="name">Web renderers</span> </a> <meta property="position" content="4"/> </li> </ol> </nav> </header> <div id="site-toc--inline" class="site-toc site-toc--inline "> <header class="site-toc__title"> Contents </header> <ul class="section-nav"> <li class="toc-entry toc-h2"><a href="#command-line-options">Command line options</a></li> <li class="toc-entry toc-h2"><a href="#choosing-which-option-to-use">Choosing which option to use</a></li> <li class="toc-entry toc-h2"><a href="#examples">Examples</a></li> </ul> </div> <p>When running and building apps for the web, you can choose between two different renderers. This page describes both renderers and how to choose the best one for your needs. The two renderers are:</p> <dl> <dt><strong>HTML renderer</strong></dt> <dd>Uses a combination of HTML elements, CSS, Canvas elements, and SVG elements. This renderer has a smaller download size.</dd> <dt><strong>CanvasKit renderer</strong></dt> <dd>This renderer is fully consistent with Flutter mobile and desktop, has faster performance with higher widget density, but adds about 2MB in download size.</dd> </dl> <h2 id="command-line-options"> <a class="anchor" href="#command-line-options" aria-hidden="true"><span class="octicon octicon-link"></span></a>Command line options</h2> <p>The <code class="language-plaintext highlighter-rouge">--web-renderer</code> command line option takes one of three values, <code class="language-plaintext highlighter-rouge">auto</code>, <code class="language-plaintext highlighter-rouge">html</code>, or <code class="language-plaintext highlighter-rouge">canvaskit</code>.</p> <ul> <li> <code class="language-plaintext highlighter-rouge">auto</code> (default) - automatically chooses which renderer to use. This option chooses the HTML renderer when the app is running in a mobile browser, and CanvasKit renderer when the app is running in a desktop browser.</li> <li> <code class="language-plaintext highlighter-rouge">html</code> - always use the HTML renderer.</li> <li> <code class="language-plaintext highlighter-rouge">canvaskit</code> - always use the CanvasKit renderer.</li> </ul> <p>This flag can be used with the <code class="language-plaintext highlighter-rouge">run</code> or <code class="language-plaintext highlighter-rouge">build</code> subcommands. For example:</p> <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>flutter run -d chrome --web-renderer html flutter build web --web-renderer canvaskit </code></pre></div></div> <p>This flag is ignored when a non-browser (mobile or desktop) device target is selected.</p> <h2 id="choosing-which-option-to-use"> <a class="anchor" href="#choosing-which-option-to-use" aria-hidden="true"><span class="octicon octicon-link"></span></a>Choosing which option to use</h2> <p>Choose the <code class="language-plaintext highlighter-rouge">auto</code> option (default) if you are optimizing for download size on mobile browsers and optimizing for performance on desktop browsers.</p> <p>Choose the <code class="language-plaintext highlighter-rouge">html</code> option if you are optimizing download size over performance on both desktop and mobile browsers.</p> <p>Choose the <code class="language-plaintext highlighter-rouge">canvaskit</code> option if you are prioritizing performance and pixel-perfect consistency on both desktop and mobile browsers.</p> <h2 id="examples"> <a class="anchor" href="#examples" aria-hidden="true"><span class="octicon octicon-link"></span></a>Examples</h2> <p>Run in Chrome using the default renderer option (<code class="language-plaintext highlighter-rouge">auto</code>):</p> <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>flutter run -d chrome </code></pre></div></div> <p>Build your app in release mode, using the default (auto) option:</p> <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>flutter build web --release </code></pre></div></div> <p>Build your app in release mode, using just the CanvasKit renderer:</p> <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>flutter build web --web-renderer canvaskit --release </code></pre></div></div> <p>Run your app in profile mode using the HTML renderer:</p> <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>flutter run -d chrome --web-renderer html --profile </code></pre></div></div> </div> </main> </div> </div> <footer class="site-footer"> <div class="container-fluid"> <div class="row"> <div class="col-md-12 site-footer__wrapper"> <div class="site-footer__logo"> <img src="/web/20210310120011im_/https://flutter.dev/images/flutter-mono-81x100.png" alt="Flutter Logo" width="81" height="100"> </div> <div class="site-footer__content"> <ul class="site-footer__link-list"> <li><a href="https://web.archive.org/web/20210310120011/https://groups.google.com/forum/#!forum/flutter-dev">flutter-dev@</a></li> <li><a href="/web/20210310120011/https://flutter.dev/tos">terms</a></li> <li><a href="/web/20210310120011/https://flutter.dev/brand">brand usage</a></li> <li><a href="/web/20210310120011/https://flutter.dev/security">security</a></li> <li><a href="https://web.archive.org/web/20210310120011/https://www.google.com/intl/en/policies/privacy">privacy</a></li> <li><a href="https://web.archive.org/web/20210310120011/https://esflutter.dev/">español</a></li> <li><a href="https://web.archive.org/web/20210310120011/https://flutter.cn/" class="text-nowrap">社区中文资源</a></li> <li><a href="https://web.archive.org/web/20210310120011/https://flutter-ko.dev/" class="text-nowrap">한국어</a></li> <li><a href="https://web.archive.org/web/20210310120011/https://blog.google/inside-google/company-announcements/standing-with-black-community">We stand in solidarity with the Black community. 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