During a typical development cycle,
you test an app using
flutter run -d chrome
(for example) at the command line.
This builds a debug version of your app.
This page helps you prepare a release version of your app and covers the following topics:
Minification is handled for you when you create a release build.
A debug build of a web app is not minified and tree shaking has not been performed.
A profile build is not minified and tree shaking has been performed.
A release build is both minified and tree shaking has been performed.
Building the app for release
Build the app for deployment using the
flutter build web command.
This generates the app, including the assets,
and places the files into the
directory of the project.
The release build of a simple app has the following structure:
/build/web assets AssetManifest.json FontManifest.json NOTICES fonts MaterialIcons-Regular.ttf <other font files> <image files> index.html main.dart.js main.dart.js.map
Launch a web server (for example,
python -m http.server 8000,
or by using the dhttpd package),
and open the /build/web directory. Navigate to
localhost:8000 in your browser
(given the python SimpleHTTPServer example)
to view the release version of your app.
Embedding a Flutter app into an HTML page
You can embed a Flutter web app,
as you would embed other content,
iframe tag of an HTML file.
In the following example, replace “URL”
with the location of your HTML page:
Deploying to the web
When you are ready to deploy your app, upload the release bundle to Firebase, the cloud, or a similar service. Here are a few possibilities, but there are many others:
As of release 1.20, the Flutter template for web apps includes support
for the core features needed for an installable, offline-capable PWA app.
Flutter-based PWAs can be installed in the same way as any other web-based
PWA; the settings signaling that your Flutter app is a PWA are provided by
manifest.json, which is produced by
flutter create in the
PWA support remains a work in progress, so please give us feedback if you see something that doesn’t look right.