Set Cypress’s application viewport with cy.viewport(width, height), check that the interface responds as expected, then save the visible area with cy.screenshot(name, { capture: 'viewport' }). This tests responsive layouts at chosen dimensions; it does not emulate every characteristic of a physical phone or compare screenshots for visual changes.
Write a responsive test at several mobile sizes
Choose dimensions that exercise your site’s breakpoints and the layouts your audience needs. The sizes below are illustrative test inputs, not claims about the most common phones. Replace the example selectors with elements from your application.
const mobileViewports = [
{ name: 'narrow mobile', width: 320, height: 640 },
{ name: 'typical mobile', width: 375, height: 812 },
{ name: 'wide mobile', width: 414, height: 896 },
]
describe('responsive navigation', () => {
mobileViewports.forEach(({ name, width, height }) => {
it(`works at ${name}`, () => {
cy.viewport(width, height)
cy.visit('/')
cy.get('[data-testid="mobile-menu-button"]').should('be.visible')
cy.get('[data-testid="desktop-navigation"]').should('not.be.visible')
cy.screenshot(`navigation-${width}x${height}`, {
capture: 'viewport',
})
})
})
})- Set the viewport before visiting the page so the application loads at the dimensions under test.
- Assert the behavior that matters, such as which navigation is visible, whether a button can be reached, or whether content fits without unwanted overflow.
- Capture after the assertions establish the desired UI state. Cypress saves screenshots to
cypress/screenshotsby default.
The example uses numeric width and height values. Cypress also accepts supported device presets and portrait or landscape orientation. For a particular project, explicit pixel dimensions make breakpoint coverage easy to see and repeat. Consult the Cypress viewport command documentation for the current preset list and command details.
Set a default viewport or change it per test
Cypress documents a default viewport of 1000 by 660 pixels. Set viewportWidth and viewportHeight in Cypress configuration when a size should be the default, or in suite or test configuration when only that group needs it. Use cy.viewport() when the size changes during a test. A viewport changed with that command resets to the configured default between tests. See Cypress configuration.
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For responsive tests that cover multiple breakpoints, setting the dimensions inside each test makes the target size explicit. In Cypress 16.0.0 and later, Cypress.config() can no longer set viewportWidth or viewportHeight during test execution; use cy.viewport() instead.
Choose the screenshot capture mode that matches the question
| Capture mode | What it captures | Use it for |
|---|---|---|
viewport |
The currently visible application viewport at the dimensions set by the test. | Reviewing what a user sees in the mobile viewport. |
fullPage |
The page from top to bottom, stitched from captures at multiple scroll positions. | Reviewing page-length content. Fixed or sticky elements may repeat in the stitched result. |
runner |
The Cypress browser context, including the runner. | Debugging when the test interface is relevant; it is not an application-only screenshot. |
The default capture mode is fullPage, so specify capture: 'viewport' when the goal is a mobile-screen view. Automatic screenshots captured on test failure are coerced to runner captures. The Cypress screenshot command documentation describes capture modes and options.
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Make screenshots useful and repeatable
- Control the application state. Wait for the relevant content and assert the expected state before capturing. Cypress’s screenshot API disables JavaScript timers and CSS animations by default during capture; callbacks are available when a test needs synchronous adjustments before or after capture.
- Keep comparison environments consistent. Use the same viewport, operating system, browser version, display scaling, and installed fonts when comparing images. Differences in the rendering environment can cause visual diffs that do not reflect meaningful application changes.
- Know what Cypress does automatically. Cypress captures screenshots on failure during
cypress run, but not automatically duringcypress open. The default screenshot folder iscypress/screenshotsand can be changed in configuration. - Do not confuse viewport with display size.
cy.viewport()sets the application viewport. Thebefore:browser:launchAPI can configure a headless browser’s display size, which affects screenshots and videos separately. Changing browser window size is not a substitute for setting the application viewport.
These commands test layout at a viewport size; Cypress does not simulate devicePixelRatio. Treat the result as responsive viewport testing, not complete physical-device emulation. See the viewport documentation and browser launch API documentation.
Use a visual testing service if you need image comparison
cy.screenshot() captures an image but does not compare it with a baseline or identify visual changes. Cypress’s visual testing guide lists integrations including Applitools Eyes, Argos, Chromatic, Happo, LambdaTest SmartUI, and Percy. The guide describes capabilities such as AI-assisted comparison, pull-request review, cloud rendering, and comparisons across browsers or responsive widths. Check each provider’s current features, availability, and commercial terms before choosing one; those details can change.
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Troubleshoot common problems
- The screenshot is desktop-sized. Set
cy.viewport(width, height)in the test beforecy.visit(). Do not rely on changing the headless browser’s display size. - The screenshot includes Cypress controls. Specify
{ capture: 'viewport' }for an application-only viewport image; a runner capture includes the Cypress browser context. - A full-page image repeats a header or toolbar. This can happen because full-page capture stitches multiple scroll positions and fixed or sticky content may recur. Use viewport capture for the view a mobile user sees.
- The image changes between runs without a code change. Verify the application state and rendering environment, including browser, operating system, fonts, display scaling, and viewport dimensions.
- You expected an automatic failure image in interactive mode. Cypress automatically captures failure screenshots during
cypress run, notcypress open. Callcy.screenshot()explicitly when you need an image during an interactive run. - You expected Cypress to report visual differences. The built-in command only captures. Add a visual testing integration if you need baseline comparison and review.
Or skip the browser setup
If you need a screenshot file rather than a Cypress test assertion, ScreenshotNeo offers a one-request screenshot API. It removes cookie banners, newsletter popups, and chat widgets before capture; each cleanup step can be turned off. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and responses identify the page verdict and billing status in headers. Its MCP server provides screenshot tools for AI agents.
Here is the cURL call; replace YOUR_API_KEY with your key and change the target URL as needed. See the ScreenshotNeo API documentation for request options.
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Frequently Asked Questions
Does Cypress emulate an iPhone or Android device when I set a mobile viewport?
No. It sets the application viewport dimensions but does not simulate device pixel ratio or provide complete physical-device emulation.
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