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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteSet Chromium’s visible page dimensions through Playwright’s viewport context option or test configuration; to resize a page that already exists, use page.setViewportSize(). Keep viewport dimensions separate from device scale factor, screenshot output scale, and full-page capture: they control different things.
Set the viewport when creating a Playwright context
Choose dimensions that match the responsive layout or device scenario you want to capture. This example creates a context with a 1280 × 1024 CSS-pixel viewport, opens a page, and saves a screenshot of the visible viewport:
const context = await browser.newContext({
viewport: { width: 1280, height: 1024 },
});
const page = await context.newPage();
await page.goto('https://example.com');
await page.screenshot({ path: 'page.png' });Set the viewport before navigating when you want the page to load and lay itself out at those dimensions. The values above are an example, not a universally correct screenshot size. Playwright documents context-level viewport configuration in its Emulation guide.
Set a viewport in Playwright Test configuration
For repeatable test runs, put the dimensions in the Chromium project’s use settings. When using a device preset, spread it first so your explicit viewport overrides the preset’s viewport:
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import { defineConfig, devices } from '@playwright/test';
export default defineConfig({
projects: [
{
name: 'chromium',
use: {
...devices['Desktop Chrome'],
viewport: { width: 1280, height: 720 },
},
},
],
});Here, the configured viewport is 1280 × 720 CSS pixels. The preset can supply other device settings, but the explicit viewport value takes precedence because it appears after the spread. Playwright describes this override pattern in its Emulation documentation.
Resize an existing page
If a page is already open, change its viewport with page.setViewportSize():
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await page.setViewportSize({ width: 1600, height: 1200 });This changes the page’s emulated visible area and can trigger a responsive layout change. Use it when a test needs to exercise more than one viewport without creating a new context.
Understand viewport, pixel density, screenshot scale, and capture scope
These settings are related but not interchangeable. A viewport describes the emulated visible area in CSS pixels; the screenshot scale determines how CSS pixels map to output image pixels.
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| Setting | What it controls | Example or effect |
|---|---|---|
viewport |
Visible page width and height in CSS pixels, affecting responsive layout. | { width: 1280, height: 720 } |
deviceScaleFactor |
Emulated device pixel density. | A value of 2 emulates twice as many device pixels per CSS pixel. |
Screenshot scale |
Output mapping: css produces one image pixel per CSS pixel; device produces one image pixel per device pixel. |
device output can produce a larger bitmap at a higher device scale factor. |
fullPage |
Capture scope: the viewport alone or the full scrollable page. | fullPage: true captures the full page rather than only the visible area. |
For example, to emulate a 1280 × 720 CSS-pixel viewport at a device scale factor of 2:
const context = await browser.newContext({
viewport: { width: 1280, height: 720 },
deviceScaleFactor: 2,
});Do not assume viewport dimensions alone determine the screenshot bitmap’s dimensions. The screenshot scale option also matters. Likewise, increasing viewport height is not the same as setting fullPage: true. Playwright documents screenshot scale and full-page behavior in its API parameters reference.
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Choose dimensions for the layout you need to test
There is no single best viewport size for every site or screenshot. Select width and height to represent the target layout, breakpoint, or test case. If the goal is to check how a page responds at different widths, capture separate cases at the widths relevant to your design rather than treating one preset as universally representative.
Use Chrome DevTools Protocol for lower-level control
If you are working directly with the Chrome DevTools Protocol (CDP), Emulation.setDeviceMetricsOverride controls emulated device dimensions, device scale factor, and mobile emulation. Screenshot capture is documented in the CDP Page domain. You need a debugging session attached to the relevant Chromium target, and protocol details can evolve, so check the schema for the Chromium build you run. When your project already uses Playwright, its context and page APIs are usually the more direct option. See the CDP Page protocol reference and the Playwright Emulation guide.
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Troubleshoot viewport and screenshot mismatches
- The page keeps using the preset’s dimensions: In Playwright Test, put
viewportafter the device preset spread inuse, so your explicit width and height override the preset. - The layout is right but the image dimensions are unexpected: Check both
deviceScaleFactorand screenshotscale. They are separate from the viewport. - The screenshot stops at the visible area: That is the normal viewport capture. Set
fullPage: trueif you need the full scrollable page. - The layout does not match the intended scenario: Confirm the viewport width and height represent the target breakpoint or device scenario; there is no universally correct size.
- A direct CDP command does not take effect: Confirm the debugging session is attached to the intended target and consult the protocol schema matching your Chromium build.
Or skip the browser setup
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Example cURL request:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for request options, including viewport controls. The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000. Learn about ScreenshotNeo or sign up for 1,000 free screenshots a month with no card.
Frequently Asked Questions
Does setting a viewport guarantee the same screenshot bitmap dimensions?
No. The screenshot scale option and device scale factor also affect the mapping from CSS pixels to output pixels.
Which Playwright viewport size should I use?
Use dimensions that represent the layout, responsive breakpoint, or device scenario you need to test; no single size is right for every page.
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Does a taller viewport capture the entire page?
No. To capture the full scrollable page, use the screenshot option fullPage: true.
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