Install @wdio/visual-service, register it in your WebdriverIO configuration, and call a check method such as browser.checkScreen('home'). The first check can create a baseline automatically; later runs compare new screenshots against it and produce diffs to review. Reliable results depend on keeping the browser, platform, device, and page state consistent between runs.
Install and configure the visual service
From your WebdriverIO project, install the service as a development dependency:
npm install --save-dev @wdio/visual-serviceRegister visual in the services array of your WebdriverIO configuration. This example sets baseline and screenshot folders and includes browser and viewport details in image names:
// wdio.conf.js
export const config = {
// Keep your existing runner, specs, capabilities, and other settings.
services: [
['visual', {
baselineFolder: './visual-baselines',
screenshotPath: './visual-screenshots',
savePerInstance: true,
formatImageName: '{tag}-{browserName}-{width}x{height}'
}]
]
};Merge these options into your existing configuration rather than replacing its other settings. The service works with WebdriverIO-supported frameworks including Mocha, Jasmine, and CucumberJS. It adds screenshot save and check commands, along with visual snapshot matchers. See the WebdriverIO visual testing guide and service options for the current configuration details.
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Choose paths and names deliberately
baselineFolder identifies where reference images are kept; screenshotPath identifies where captured screenshots are stored. formatImageName controls the filename, not the folder. Include enough environment information in names to distinguish runs: the service supports fields such as tag, browser name and version, device, platform, viewport dimensions, and device pixel ratio. A capability’s logName can also distinguish browser or device configurations. Use the path options or a per-method folder option to change folders.
Write a test and create the first baseline
Navigate to a known page state, wait for your application’s content to settle, then call the check method that matches the scope you want to compare:
describe('home page visual appearance', () => {
it('matches the home screen', async () => {
await browser.url('http://localhost:3000/');
await $('[data-testid="home-ready"]').waitForDisplayed();
await browser.checkScreen('home');
});
});The readiness selector is application-specific: replace it with an element that indicates the page is ready for capture. A check method captures and compares in one step; a separate save call before each check is unnecessary. On the first run, the service creates a baseline automatically because autoSaveBaseline defaults to true. The initial image should still be reviewed as a deliberate reference, not assumed to be correct just because the test passed.
For initial setup, avoid combining save and compare methods when a check method already creates the baseline. If you want to control baseline creation explicitly, disable automatic baseline saving and use the documented save workflow instead. The writing tests guide, methods reference, and FAQ describe the available workflows.
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Pick the capture scope
browser.checkElement(selector, 'hero')compares a selected component, useful when the test is about that component rather than the whole screen.browser.checkScreen('home')compares the current viewport.browser.checkFullPageScreen('page')compares the full page.
Visual snapshot matchers are another option: for example, toMatchScreenSnapshot and toMatchElementSnapshot. Use one consistent style in a test suite so the intent and baseline names remain clear.
Make captures repeatable
Visual comparison is most useful when a difference reflects an application change rather than a changed rendering environment. Keep the baseline and test run on the same browser, operating system, device, viewport, and device pixel ratio where possible. WebdriverIO’s guidance is to compare screenshots within the same platform. Browser or operating-system updates can alter font rendering, so review diffs after changing them.
Stabilize the page state
- Use predictable test data and authentication rather than changing production-like records.
- Fix the viewport and device settings for a baseline set.
- Wait for application-specific content to appear and for asynchronous UI changes to finish.
- Account for animations, rotating content, timestamps, and other intentional variability using the service’s controls only where appropriate.
The service waits for fonts to load by default. Other controls can disable CSS animation, hide scrollbars or blinking carets, ignore selected regions, or enable layout testing, which makes text transparent to focus comparison on layout. Use ignored regions narrowly: a broad mask may conceal the very regression the test should catch. Comparison options also include anti-aliasing tolerance for small edge differences; enable it only if that tolerance suits the purpose of the test. See method options and comparison options.
Choose full-page capture based on page behavior
For desktop web full-page screenshots, the default capture uses WebDriver BiDi without scrolling. If content is lazy-loaded or rendering depends on scroll position, enable userBasedFullPageScreenshot. That mode scrolls through the page, captures viewport images, and stitches them together; it can take longer. Choose it when the page requires scrolling to render the content under test, rather than enabling it automatically.
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Resizing a desktop browser is not a substitute for checking a real mobile browser or device. WebdriverIO also advises against headless browsers for this visual service because the goal is to compare the end-user rendered view. Appium-backed mobile browsers, native apps, and hybrid apps are supported, but require context-specific setup; hybrid apps need isHybridApp: true.
Review diffs and update baselines safely
When a check finds a difference, inspect the baseline, actual screenshot, and diff image together. Decide whether the difference is an intended design change, a rendering-environment change, or a regression. Do not accept a new baseline solely to make a test pass.
The --update-visual-baseline CLI flag copies actual images over failing baselines, allowing the changed tests to pass. Run it only after reviewing the images and confirming that the new appearance is intended. Baselines are test artifacts: review them after browser, operating-system, device, font, or visual-service engine changes.
Version changes can affect comparison results. The WebdriverIO visual testing documentation says version 10 changed the comparison engine from ResembleJS to Pixelmatch. The docs describe Pixelmatch as using a perceptual YIQ color model; mismatch percentages can therefore differ from version 9. Review the actual diffs when upgrading instead of assuming an old threshold means the same thing.
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Set mismatch tolerance with care
A mismatch percentage is not a quality verdict. On a large image, even a seemingly small threshold can permit a meaningful control or layout change. Use the diff image to identify what changed, then set thresholds and any anti-aliasing tolerance according to the risk of the page and the team’s review policy.
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For repeatable CI results, keep the runner’s browser and platform consistent with the environment used to create the baseline. If CI uses a different operating system or browser version, expect rendering differences and maintain separate baselines where appropriate. A passing local test does not establish that a different CI renderer will produce identical pixels.
- First run reports a missing baseline: confirm the configured baseline folder is writable and that automatic baseline creation is enabled, or follow the explicit save workflow.
- Every run produces diffs: compare browser, platform, viewport, device pixel ratio, and font availability. Check whether the page state is changing or content is still loading at capture time.
- Lazy content is absent in a full-page image: try
userBasedFullPageScreenshotfor pages whose content appears only during scrolling. - Tests fail after a service upgrade: inspect diffs and review comparison-engine changes, especially when moving to version 10 from version 9.
- Too many unhelpful differences: stabilize the page and environment before increasing tolerance or masking regions. Narrow any ignored area to the dynamic content that cannot reasonably be stabilized.
WebdriverIO’s considerations page covers platform consistency, mobile simulation, headless guidance, and mismatch thresholds.
When to add a hosted visual review service
The built-in visual service is sufficient for local or CI screenshot comparisons against project-managed baselines. A hosted service may be useful when the team specifically needs hosted browser or device execution, or a shared visual review workflow. BrowserStack Percy is an optional integration, not a prerequisite for WebdriverIO visual tests. Its integration paths and supported WebdriverIO versions differ in vendor documentation: BrowserStack’s SDK page reports support up to WebdriverIO 8, while Percy SDK support is reported up to WebdriverIO 9. Check the current WebdriverIO Percy integration guide and BrowserStack integration documentation for the exact stack before implementing it.
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For API setup and response details, see the ScreenshotNeo documentation.
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Frequently Asked Questions
Does WebdriverIO visual testing work with CucumberJS?
Yes. The visual service supports WebdriverIO-supported frameworks including CucumberJS, Mocha, and Jasmine.
Can I use the service for native or hybrid mobile apps?
Yes, with Appium-backed setup specific to the target; hybrid apps require isHybridApp: true.
Do I need a separate screenshot save call before every visual check?
No. Check methods capture and compare the screenshot themselves.
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