Set the viewport before capturing: in Playwright, pass viewport: { width, height } when creating a browser context or in Playwright Test configuration. To resize a page that already exists, use page.setViewportSize(). Viewport dimensions control the visible CSS layout area; device scale factor, screenshot pixel scale, and full-page capture are separate settings.
Set the viewport in Playwright Test
Configure the Chromium project’s viewport in playwright.config.js or its TypeScript equivalent. When using a device preset, spread it first so the explicit viewport below 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 },
},
},
],
});Choose dimensions that match the layout or responsive breakpoint you need to test. The values above are examples, not universally correct screenshot dimensions. Playwright documents context viewport configuration and page resizing in its Emulation guide.
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For a standalone Playwright script, pass the viewport to browser.newContext() before creating the page. This complete example launches Chromium, navigates to a page, saves a screenshot, and closes the browser:
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import { chromium } from 'playwright';
const browser = await chromium.launch();
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' });
await context.close();
await browser.close();The width and height are CSS pixels. They define the emulated visible area of the page and affect responsive layout.
Resize an existing page
If the page has already been created, change its viewport with page.setViewportSize() before taking the screenshot:
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await page.setViewportSize({ width: 1600, height: 1200 });
await page.screenshot({ path: 'page.png' });This resizes the visible browser area; it does not request that the screenshot include all content below the fold.
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“Resolution” can refer to several different settings. Set each one according to the result you need:
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| Setting | What it controls | How to set it |
|---|---|---|
| Viewport | The visible page dimensions in CSS pixels and the responsive layout scenario. | viewport: { width, height } in a context or project, or page.setViewportSize(). |
| Device scale factor | Emulated pixel density, which is independent of viewport width and height. | Set deviceScaleFactor in the browser context. |
| Screenshot scale | Whether output pixels follow CSS pixels or device pixels. Device-pixel output can be larger for a high-DPI context. | Use the screenshot scale option, 'css' or 'device'. |
| Capture scope | Whether the screenshot covers the visible viewport or the full scrollable page. | Set fullPage: true to capture the full page. |
For example, to emulate a high-density display, configure device scale factor separately:
const context = await browser.newContext({
viewport: { width: 1280, height: 720 },
deviceScaleFactor: 2,
});Then choose screenshot scale for the desired bitmap output. Playwright’s API reference explains the scale and fullPage options in its API parameters documentation. Increasing viewport height and setting fullPage: true are not interchangeable: the former changes the visible area, while the latter captures beyond it.
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Use Chromium’s DevTools Protocol for lower-level control
If you are controlling Chromium through the Chrome DevTools Protocol (CDP), Emulation.setDeviceMetricsOverride sets emulated device metrics, including dimensions and device scale factor. The Page domain includes screenshot capture functionality. CDP commands require a debugging session attached to the relevant target, and protocol details can change between Chromium builds. Check the schema for the Chromium version you run in the Chrome DevTools Protocol Page reference and the corresponding Emulation domain documentation. If your project already uses Playwright, its context and page APIs are usually the more direct option.
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ScreenshotNeo can return a screenshot from one GET request. Set the viewport with its documented request parameters; see the ScreenshotNeo API documentation for the available options.
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Troubleshooting viewport screenshots
- The page uses the wrong responsive layout: Verify that the intended width and height are set on the context or project before navigation and capture. If a device preset is involved, spread it before the explicit
viewportso your values take precedence. - The image dimensions do not match the viewport numbers: Check
deviceScaleFactorand the screenshotscaleoption. Viewport dimensions are CSS pixels, and screenshot scale determines whether output is based on CSS or device pixels. - The screenshot cuts off content: A taller viewport only changes the visible area. Use
fullPage: truewhen you need the full scrollable page. - A responsive change is missing after resizing: Ensure
page.setViewportSize()completes before taking the screenshot, then allow the page’s layout and any responsive scripts to update. - CDP metrics have no effect: Confirm that the debugging session is attached to the target you are capturing and consult the protocol schema matching your Chromium build; CDP details evolve.
Frequently Asked Questions
What viewport size should I use for a Chromium screenshot?
There is no single universally correct size. Choose the width and height for the device or responsive layout scenario you want to represent.
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Can I set a viewport in plain Chromium without Playwright?
Yes. Chromium automation through CDP can set device metrics with Emulation.setDeviceMetricsOverride; it requires an attached debugging session.
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