Do these 3 things before closing this tab:
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driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteIn Playwright, “screen size” usually means the web page’s viewport—the width and height, in CSS pixels, that responsive code can see. Set it in Playwright Test with use.viewport, set it for a single test with test.use(), configure it on a browser context, or resize an existing page with page.setViewportSize(). Playwright Test’s documented default is 1280 × 720 pixels.
This is different from enlarging the operating system’s visible browser window. Use viewport settings for repeatable layout tests; only use browser launch arguments for an outer-window workaround when you understand the browser-specific risks.
What “screen size” means in Playwright
There are three related settings that are easy to confuse:
- Viewport: The emulated page area, measured in CSS pixels. This controls media queries, responsive breakpoints, and the layout available to the page.
- Device emulation: A preset that can include viewport, screen size, user agent, touch support, and other device characteristics.
- Outer browser window: The visible desktop window supplied by the operating system. It is not the same as the page viewport and is not a portable way to test responsive layouts.
For most “make the screen larger” questions, increase the viewport width and height. For example, a 1600 × 1200 viewport gives the page more CSS-pixel space without requiring a larger physical monitor.
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Playwright’s viewport is independent of deviceScaleFactor. The latter changes the emulated device pixel ratio; it does not increase the page’s CSS width or height.
Increase the viewport for an entire Playwright project
Use the use.viewport option in playwright.config.ts when a project or most of its tests should run at one fixed size.
import { defineConfig } from '@playwright/test';
export default defineConfig({
use: {
viewport: { width: 1600, height: 1200 },
},
});Run the suite normally:
npx playwright testThe setting is applied to each test context and its pages. Keeping the dimensions in configuration makes screenshots, responsive assertions, and CI runs deterministic.
Use a project matrix for desktop sizes
If you need several desktop breakpoints, define separate projects rather than changing the viewport unpredictably inside tests.
import { defineConfig } from '@playwright/test';
export default defineConfig({
projects: [
{
name: 'desktop-wide',
use: { viewport: { width: 1600, height: 1000 } },
},
{
name: 'desktop-standard',
use: { viewport: { width: 1280, height: 720 } },
},
],
});A project matrix makes a failure identify the exact dimensions that exposed it.
Change the viewport for one test file or block
Use test.use() when only a file or a group of tests needs a larger viewport. This keeps the rest of the suite at its normal size.
import { test, expect } from '@playwright/test';
test.use({ viewport: { width: 1440, height: 900 } });
test('wide navigation is visible', async ({ page }) => {
await page.goto('https://example.com');
await expect(page.getByRole('navigation')).toBeVisible();
});You can also scope the option to a block:
import { test } from '@playwright/test';
test.describe('wide layout', () => {
test.use({ viewport: { width: 1920, height: 1080 } });
test('renders the desktop layout', async ({ page }) => {
await page.goto('https://example.com');
});
});Place the setting before the tests in that scope. A nested block can override an outer value.
Resize one page during a test
For a page created by the Playwright Test page fixture, call page.setViewportSize():
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import { test, expect } from '@playwright/test';
test('checks two responsive layouts', async ({ page }) => {
await page.setViewportSize({ width: 1600, height: 1000 });
await page.goto('https://example.com');
await expect(page.locator('body')).toBeVisible();
await page.setViewportSize({ width: 800, height: 600 });
await expect(page.getByRole('button', { name: 'Menu' })).toBeVisible();
});Set the size before navigation whenever possible. Many sites do not expect a phone-sized viewport to change after the page has loaded; scripts may have already selected a layout, measured elements, or installed event handlers. If you must resize after navigation, wait for the UI to settle before asserting it.
Read the current dimensions
Browser-side JavaScript can verify what the page receives:
const size = await page.evaluate(() => ({
width: window.innerWidth,
height: window.innerHeight,
}));
console.log(size);window.innerWidth and window.innerHeight are CSS-pixel viewport dimensions. They are not the physical monitor size and can differ from an element’s bounding box or the full document height.
Set the viewport when using Playwright Library directly
If you create a browser yourself rather than using Playwright Test, put viewport in browser.newContext(). Every page in that context inherits the value.
import { chromium } from 'playwright';
const browser = await chromium.launch();
const context = await browser.newContext({
viewport: { width: 1600, height: 1200 },
});
const page = await context.newPage();
await page.goto('https://example.com');
await page.screenshot({ path: 'wide.png', fullPage: true });
await browser.close();Use a separate context when two sizes must run independently. Contexts isolate cookies, storage, and emulation settings, so a resize in one does not silently alter another.
Use a device descriptor, then override its viewport
Device descriptors are appropriate when width and height are only part of the test. They can configure a user agent, screen characteristics, touch support, and other device behavior. Import a descriptor from playwright and spread it into a new context or test configuration.
import { chromium, devices } from 'playwright';
const browser = await chromium.launch();
const context = await browser.newContext({
...devices['iPhone 13'],
viewport: { width: 500, height: 900 },
});
const page = await context.newPage();
await page.goto('https://example.com');
await browser.close();The explicit viewport appears after the spread, so it overrides the preset viewport. The descriptor’s other characteristics remain in effect. In Playwright Test, the equivalent is:
import { defineConfig, devices } from '@playwright/test';
export default defineConfig({
projects: [
{
name: 'custom-phone-width',
use: {
...devices['iPhone 13'],
viewport: { width: 500, height: 900 },
},
},
],
});Record a larger viewport with codegen
When generating a test interactively, pass --viewport-size to Playwright Codegen:
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npx playwright codegen --viewport-size="1600,1000" https://playwright.devReplace the example dimensions and URL with your target. Codegen opens the recorder at that viewport and produces actions that you can save into a test. The option changes the generated session; put the resulting dimensions in your project configuration if the test must remain reproducible when run later.
When the viewport is not enough
Full-page screenshots versus a taller viewport
A taller viewport shows more content at once, but it does not make the document itself shorter. For a screenshot of the complete page, use fullPage: true:
await page.screenshot({ path: 'page.png', fullPage: true });This captures the full scrollable document using the current viewport width. It is different from increasing the viewport height.
Outer window size and headed mode
A visible desktop window can be affected by browser launch arguments, but that is separate from the page viewport. The Playwright options documentation shows --start-maximized as an example Chromium argument and warns that custom browser arguments may break Playwright functionality. It is not documented as a portable, exact-dimension solution across Chromium, Firefox, and WebKit.
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Host-dependent sizing with viewport: null
Setting viewport: null lets the viewport depend on the host window. This can be useful for an interactive headed session, but the dimensions then vary with the developer machine, display scaling, window manager, and CI environment. Playwright documents this as nondeterministic; fixed width and height are preferable for repeatable tests.
Choose dimensions deliberately
There is no universally correct “large” size. Pick dimensions that represent a supported layout or a risk you want to exercise.
- Desktop regression: Start with the project’s documented desktop breakpoint, then add a wider case such as 1440 or 1600 pixels if navigation or data tables change at large widths.
- Responsive boundaries: Test just below and just above each CSS breakpoint, not only a very wide and a very narrow screen.
- Visual snapshots: Keep width, height, browser engine, and device scale factor stable so diffs represent page changes rather than environment changes.
- Long pages: Keep a realistic viewport height and use full-page capture when the requirement is document coverage.
- Touch devices: Use a descriptor when touch, user agent, or mobile behavior matters; changing width alone does not emulate a phone.
Document the reason for unusual dimensions in the configuration. A 1920-pixel test that exists to expose a horizontal overflow bug is easier to maintain when that intent is explicit.
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Troubleshooting viewport-size problems
The page still looks narrow
- Confirm the setting is in the configuration actually used by the command. A different project may have its own
use.viewport. - Check that you changed the viewport, not only
deviceScaleFactor. - Log
window.innerWidthandwindow.innerHeightafter navigation. - Look for application CSS that imposes a fixed
max-width; Playwright cannot remove a site’s own layout constraint.
A device preset keeps restoring its old size
Spread the descriptor first and put your explicit viewport afterward. The later property wins in JavaScript object construction:
use: {
...devices['Pixel 5'],
viewport: { width: 600, height: 900 },
}Changing size after navigation causes broken layout
Move page.setViewportSize() before page.goto(). If a test intentionally exercises live resizing, wait for the application’s resize work to complete and assert behavior rather than relying on a screenshot taken immediately after the call.
The test passes locally but fails in CI
Check for viewport: null, outer-window dependencies, and browser-specific launch arguments. Replace host-dependent sizing with explicit dimensions. Run the same project and browser engine locally as CI, and record the actual viewport in failure diagnostics.
Only a portion of the page appears in the screenshot
A larger viewport is not a full-page capture. Use fullPage: true, or scroll and capture sections when the page contains lazy-loaded content that must be triggered explicitly.
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Or skip the browser setup
If the goal is simply to obtain a clean screenshot at a chosen viewport, ScreenshotNeo provides a GET endpoint instead of requiring local browser installation and viewport orchestration. The service accepts the URL and returns PNG, JPEG, or WebP; its options include any viewport, full-page capture with lazy images loaded, device presets, retina scale, CSS-selector element capture, dark mode, custom CSS and JavaScript, click and wait actions, request blocking, headers, cookies, user agents, timezone, geolocation, transparent backgrounds, resizing, caching, signed links, asynchronous jobs, webhooks, and bulk capture of up to 100 URLs per call.
Example cURL request (see the ScreenshotNeo documentation for the complete parameter list):
curl -G "https://api.screenshotneo.com/v1/shot"
-d access_key=YOUR_API_KEY
--data-urlencode url=https://stripe.com
-d viewport_width=1600
-d viewport_height=1200
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Python and Node.js alternatives for ScreenshotNeo
The same endpoint can be called from application code. Keep the API key private and set a request timeout appropriate for the page being rendered.
Python
import requests
r = requests.get(
"https://api.screenshotneo.com/v1/shot",
params={
"access_key": "YOUR_API_KEY",
"url": "https://stripe.com",
"viewport_width": 1600,
"viewport_height": 1200,
},
timeout=90,
)
r.raise_for_status()
open("shot.webp", "wb").write(r.content)Node.js
const q = new URLSearchParams({
access_key: 'YOUR_API_KEY',
url: 'https://stripe.com',
viewport_width: '1600',
viewport_height: '1200'
});
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`Screenshot failed: ${res.status}`);
const data = Buffer.from(await res.arrayBuffer());
await Bun.write('shot.webp', data);Quick reference
| Need | Use |
|---|---|
| Every test in a project | use.viewport in playwright.config.ts |
| One file or describe block | test.use({ viewport: { width, height } }) |
| Direct Playwright Library context | browser.newContext({ viewport: { width, height } }) |
| Resize one existing page | await page.setViewportSize({ width, height }) |
| Generate a test interactively | npx playwright codegen --viewport-size="width,height" URL |
| Emulate a device plus custom dimensions | Spread a device descriptor, then set viewport |
| Use the host window | viewport: null, with nondeterministic dimensions |
FAQ
What is Playwright’s default screen size?
Playwright Test documents a default viewport of 1280 × 720 pixels.
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Can I set a viewport larger than my monitor?
Yes. The viewport is an emulated CSS-pixel area, so it does not have to match the physical display attached to the machine.
Does increasing the viewport emulate a larger device?
No. A viewport changes page dimensions. Device emulation also changes characteristics such as user agent and touch behavior.
Which setting should I use for responsive tests?
Use fixed use.viewport or test.use() values. They are more repeatable than relying on an OS window.
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Frequently Asked Questions
What is Playwright’s default screen size?
Playwright Test documents a default viewport of 1280 × 720 pixels.
Can I set a viewport larger than my monitor?
Yes. The viewport is an emulated CSS-pixel area, so it does not have to match the physical display attached to the machine.
Does increasing the viewport emulate a larger device?
No. A viewport changes page dimensions. Device emulation also changes characteristics such as user agent and touch behavior.
Which setting should I use for responsive tests?
Use fixed use.viewport or test.use() values. They are more repeatable than relying on an OS window.
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