Thescreenshots manifest member lets you specify one or more images that showcase your web application.These images help users preview your web app's interface and features in app stores.

Syntax

/* Single screenshot */"screenshots": [  {    "src": "desktop.webp",    "sizes": "1280x720",    "type": "image/webp"  }]/* Two screenshots */"screenshots": [  {    "src": "screenshots/home.webp",    "sizes": "1280x720",    "type": "image/webp",    "form_factor": "wide",    "label": "Home screen showing main navigation and featured content"  },  {    "src": "screenshots/dashboard.webp",    "sizes": "1280x720",    "type": "image/webp",    "platform": "ios",    "label": "Dashboard view displaying key metrics"  }]

Values

screenshots

An array of objects.Each object represents a screenshot of the web app in a common usage scenario.

Each screenshot object can have one or more properties. Of these, onlysrc is required. The possible properties include:

src

A string that specifies the path to the image file.It has the same format as theicons member'ssrc property.

sizesOptional

A string that specifies one or more sizes of the image.It has the same format as theicons member'ssizes property.

typeOptional

A string that specifies theMIME type of the image.It has the same format as theicons member'stype property.

labelOptional

A string that represents the accessible name of the screenshot object.Keep it descriptive because it can serve as alternative text for the rendered screenshot.For accessibility, it is recommended to specify this property for every screenshot.

form_factorOptional

A string that represents the screen shape of a broad class of devices to which the screenshot applies.Specify this property only when the screenshot applies to a specific screen layout.Ifform_factor is not specified, the screenshot is considered suitable for all screen types.

Valid values include:

narrow

Indicates that the screenshot is applicable only to narrow screens, such as mobile devices.

wide

Indicates that the screenshot is applicable only to wide screens, such as desktop computers.

platform

A string that represents the platform to which the screenshot applies.Specify this property only when the screenshot applies to a specific device or distribution platform.Ifplatform is not specified, the screenshot is considered suitable for all platforms.

Valid values include:

Type	Value	Description
Operating systems	android	Google Android
	chromeos	Google ChromeOS
	ios	Apple iOS
	ipados	Apple iPadOS
	kaios	KaiOS
	macos	Apple macOS
	windows	Microsoft Windows
	xbox	Microsoft Xbox
Distribution platforms	chrome_web_store	Google Chrome Web Store
	itunes	iTunes App Store
	microsoft-inbox	Pre-installed with Microsoft Windows
	microsoft-store	Microsoft Store
	play	Google Play Store

Description

Thescreenshots member is supplementary metadata that does not affect the app's runtime behavior or how browsers present the app.Screenshots are used in app stores and other distribution platforms to showcase your app's features to potential users.

Distribution platforms may choose how many screenshots to display.

The images below from the Apple App Store show how screenshots appear in an iPhone app listing.In the gallery view (image on the left), users can scroll through multiple images horizontally.They can tap any image to view it in full screen (image on the right).

The same full-screen image on iPad shows why different screenshots are needed for narrow (iPhone) and wide (iPad) device form factors:

Examples

Adding previews for a meal planning web app

This example shows how to add screenshots for a meal planning app for different devices. The screenshots show the same feature of the app in desktop and mobile views:

{  "name": "Meal Planner",  "screenshots": [    {      "src": "screenshots/desktop-home.webp",      "sizes": "1920x1080",      "form_factor": "wide",      "label": "Desktop view showing weekly meal calendar"    },    {      "src": "screenshots/mobile-home.webp",      "sizes": "750x1334",      "form_factor": "narrow",      "label": "Mobile view showing weekly meal calendar"    }  ]}

Specifications

Browser compatibility

Thescreenshots manifest member is used by app stores when publishing and listing web apps, so browser compatibility is not applicable.While browsers may parse this member, it's optional and doesn't affect the app's functionality or presentation.