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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Set viewport and deviceScaleFactor explicitly in your Playwright Test configuration or browser context. For example, a 1280 × 720 CSS-pixel viewport at device scale factor 1 gives screenshot tests a defined starting environment instead of relying on browser or host-window sizing.
Set both values in Playwright Test configuration
For tests using Playwright Test, define the settings under use in playwright.config.ts:
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import { defineConfig } from '@playwright/test';
export default defineConfig({
use: {
viewport: { width: 1280, height: 720 },
deviceScaleFactor: 1,
},
});This applies the same viewport and emulated device pixel ratio to pages created by the test runner. The values are explicit even though Playwright documents defaults of 1280 × 720 and a device scale factor of 1; explicit configuration makes the intended baseline clear. See the Playwright TestOptions reference.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsSet the values on a browser context
If you create contexts directly rather than using Playwright Test’s configuration, pass both options to browser.newContext() before creating pages or navigating:
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import { chromium } from 'playwright';
const browser = await chromium.launch();
const context = await browser.newContext({
viewport: { width: 1280, height: 720 },
deviceScaleFactor: 1,
});
const page = await context.newPage();
await page.goto('https://example.com');
await page.screenshot({ path: 'baseline.png' });
await browser.close();Context-level settings are useful when every page in that context should share one environment. The BrowserType API reference documents context options.
Understand viewport, device scale factor, and screenshot scale
viewportis the page’s width and height in CSS pixels. It affects responsive layout, such as whether a site uses its desktop or mobile breakpoints.deviceScaleFactoremulates the device pixel ratio. Set it explicitly so a baseline is not compared with a run configured at a different ratio.- The screenshot option
scalecontrols output dimensions:'css'produces one image pixel per CSS pixel, while'device'produces one image pixel per device pixel. A device-scale capture can therefore have more pixels than a CSS-scale capture.
Keep these settings distinct when diagnosing image-size changes: the CSS viewport determines layout dimensions, the device scale factor emulates pixel density, and screenshot scale determines how those dimensions map to the output image. Playwright documents screenshot behavior in its Page API reference.
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Choose the right place to configure the viewport
Use context options for a stable test environment
Set viewport and deviceScaleFactor at context creation when all pages in that context should use the same dimensions and pixel ratio. This also lets you configure screen alongside the viewport if your test needs a specific emulated screen size.
Use page.setViewportSize() for an intentional per-page change
page.setViewportSize({ width, height }) changes an existing page’s viewport. For responsive sites, apply it before navigation when possible: many sites are not designed to have their size changed after loading. This method also resets the page’s screen dimensions, so use context-level screen and viewport options if both need precise control. See the Page API reference.
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Keep screenshot baselines deterministic
- Avoid
viewport: nullwhen you need repeatable screenshot dimensions. Playwright describes null viewport sizing as dependent on the operating-system window, making it nondeterministic. - Set the device scale factor explicitly, even when using the documented default of 1.
- Choose screenshot output scale deliberately and keep it consistent between baseline creation and later comparisons.
- For dynamic content, Playwright screenshots can apply a stylesheet or mask selected locators. Use these controls to hide or cover regions that should not determine the visual comparison.
- Record the browser engine, viewport, device scale factor, and screenshot output scale alongside each baseline. These are separate configuration axes.
Run separate browser or device configurations with projects
When a test must cover multiple engines or emulated devices, use Playwright Test projects to run configurations such as Chromium, Firefox, WebKit, or device presets. Keep each screenshot baseline associated with its intended project and settings rather than comparing images captured under different engines, viewport dimensions, or pixel ratios. See Playwright Projects and Playwright’s device emulation guidance.
Troubleshoot mismatched screenshots
The page has a different layout than the baseline
Check the configured viewport width and height first. Confirm that the context or test configuration is being used for the page, and avoid changing the viewport after navigation unless that is the behavior you are testing.
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The screenshot image dimensions differ
Check both deviceScaleFactor and the screenshot scale option. A device-scale image can be larger than a CSS-scale image even when the CSS viewport is unchanged.
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The reported screen dimensions do not match expectations
If you called page.setViewportSize(), remember it resets screen. Configure both screen and viewport when creating the context if the emulated screen size matters.
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Runs vary by machine or window
Look for viewport: null or other configuration that makes the capture depend on the operating-system window. Set fixed context or test options instead.
Or skip the browser setup
For a one-request screenshot of a public page, ScreenshotNeo returns an image or PDF from a URL. See the ScreenshotNeo API documentation for its parameters and output options.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpScreenshotNeo accepts cookie banners before capture and removes supported consent banners, newsletter popups, and chat widgets. Bot checks, blank pages, failed loads, timeouts, and cache hits are not billed. Its MCP server provides screenshot tools for AI agents, and the free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000 screenshots. It is an API alternative, not a replacement for configuring local Playwright screenshot tests or their browser-specific baselines.
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Frequently Asked Questions
What viewport and device scale factor does Playwright use by default?
Playwright’s current BrowserType and TestOptions documentation lists a 1280 × 720 viewport and a device scale factor of 1. Set them explicitly when those values define your intended screenshot baseline.
Does deviceScaleFactor change the CSS viewport?
No. The viewport sets page dimensions in CSS pixels; deviceScaleFactor emulates device pixel ratio. Screenshot output scale separately determines whether output pixels correspond to CSS or device pixels.
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