Playwright screenshot resolution has two controls: the viewport sets the page’s layout size in CSS pixels, while the screenshot’s scale sets how many image pixels represent each CSS pixel. Choose the viewport for the layout you want to capture, then choose scale: 'css' for a one-to-one CSS-pixel image or scale: 'device' for output at the emulated device-pixel ratio.
Viewport size and screenshot resolution are different
A viewport determines the browser’s emulated visible page area and responsive layout. For example, a viewport of 1440 by 900 means the page lays out at 1440 CSS pixels wide and 900 CSS pixels tall. It does not necessarily mean the saved screenshot will be 1440 by 900 image pixels: that also depends on the screenshot scale and device scale factor.
The device scale factor (DPR) describes the relationship between CSS pixels and device pixels. With a DPR of 2, a CSS-pixel layout can be represented by twice as many device pixels in each dimension. Playwright lets you set the DPR with deviceScaleFactor on a browser context or in Playwright Test configuration. The screenshot’s scale option determines whether the output follows CSS pixels or device pixels.
| What you want to control | Playwright setting | What it changes |
|---|---|---|
| Page layout width and height | viewport: { width, height } or page.setViewportSize() |
Emulated viewport dimensions in CSS pixels. |
| One output pixel per CSS pixel | page.screenshot({ scale: 'css' }) |
Image dimensions track the captured CSS-pixel dimensions. |
| Output at device-pixel density | page.screenshot({ scale: 'device' }) |
Image pixels correspond to device pixels, so higher DPR can increase output dimensions. |
| Emulated pixel density | deviceScaleFactor |
Sets the context’s DPR; it does not set viewport width or height. |
| Capture content below the visible area | fullPage: true |
Changes the captured extent to the full scrollable page, not the viewport or raster scale. |
Set screenshot resolution in Playwright with JavaScript
Set the viewport and device scale factor when creating the browser context. Then select screenshot scale explicitly so the output does not rely on a default. This complete Node.js example writes a PNG at device-pixel scale:
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const { chromium } = require('playwright');
(async () => {
const browser = await chromium.launch();
const context = await browser.newContext({
viewport: { width: 1440, height: 900 },
deviceScaleFactor: 2,
});
const page = await context.newPage();
try {
await page.goto('https://example.com', { waitUntil: 'load' });
await page.screenshot({ path: 'page.png', scale: 'device' });
} finally {
await context.close();
await browser.close();
}
})();This requests a 1440×900 CSS-pixel viewport and emulates DPR 2. With scale: 'device', the screenshot uses device pixels; for a conventional 1:1 CSS-pixel output, change the screenshot option to scale: 'css'. The example uses the official API options; it is not a claim that the code was independently executed.
Use a different viewport for each capture
For an existing page, call page.setViewportSize() before navigation where possible:
await page.setViewportSize({ width: 390, height: 844 });
await page.goto('https://example.com');
await page.screenshot({ path: 'mobile.png', scale: 'css' });page.setViewportSize() resizes the page and resets its screen size. If you need coordinated control over viewport and screen behavior, configure the browser context before creating the page. Playwright documents this API in the Page API reference.
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Choose the right output scale
Use CSS scale for layout review and predictable dimensions
Choose scale: 'css' when you want one output image pixel per CSS pixel. It is usually the easiest choice for comparing page layouts, checking responsive breakpoints, or producing compact snapshots whose dimensions correspond directly to the page’s CSS-pixel size.
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Choose scale: 'device' when the screenshot should use the emulated device’s pixel density. Pair it with an intentional deviceScaleFactor; otherwise the context’s DPR setting determines the density. A higher-density capture can preserve finer detail, but it also creates a larger image in each dimension and can increase file size and downstream processing work.
const context = await browser.newContext({
viewport: { width: 1440, height: 900 },
deviceScaleFactor: 2,
});
const page = await context.newPage();
await page.goto('https://example.com');
await page.screenshot({ path: 'retina.png', scale: 'device' });The Page API reference describes screenshot scale as defaulting to device, but defaults can be version-sensitive. Set the option explicitly when exact dimensions matter, and check the documentation matching your installed Playwright version. See Playwright’s Page API and its Screenshots documentation for the CSS-versus-device distinction.
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Set dimensions in Playwright Test
Playwright Test’s configuration can establish a consistent viewport and device scale factor for tests, rather than repeating them in each test. Put these values under use in playwright.config.js:
const { defineConfig } = require('@playwright/test');
module.exports = defineConfig({
use: {
viewport: { width: 1440, height: 900 },
deviceScaleFactor: 2,
},
});To make a test screenshot at CSS-pixel scale, specify the screenshot scale in the test:
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const { test } = require('@playwright/test');
test('capture at CSS-pixel scale', async ({ page }) => {
await page.goto('https://example.com');
await page.screenshot({ path: 'page.png', scale: 'css' });
});Playwright Test documents a default viewport of 1280×720 and a default deviceScaleFactor of 1 in its options documentation reviewed in 2026. These are documented defaults, not measurements; explicit settings are better for repeatable captures. Setting viewport: null opts out of the consistent viewport and makes dimensions depend on the host window, which Playwright describes as non-deterministic. See Playwright Test options.
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Capture a full-page screenshot without confusing it with resolution
fullPage: true captures the page’s full scrollable extent rather than only the visible viewport. It does not set a fixed image height, viewport size, or pixel density. The final height follows the page’s scrollable content, so pages with different content heights can produce different image dimensions even when the viewport and scale are identical.
await page.screenshot({
path: 'full-page.png',
fullPage: true,
scale: 'css',
});Use viewport or setViewportSize() to control the layout width and visible viewport, scale and deviceScaleFactor for pixel density, and fullPage only when the desired capture should extend beyond the fold. The Page API documents screenshot and viewport options.
Common resolution problems and fixes
- The image is larger than the viewport dimensions. You may be capturing at
scale: 'device'with a DPR above 1. Setscale: 'css'for one image pixel per CSS pixel, or lowerdeviceScaleFactorif device-pixel output is not needed. - The page layout is not the intended desktop or mobile size. Set the viewport explicitly on the context or call
page.setViewportSize(). Changing output scale alone does not change responsive layout width. - The screenshot is taller than expected. Check whether
fullPage: trueis enabled. It captures the full scrollable page; remove it for a viewport-only image. - Screenshots differ across machines. Check for
viewport: null, which uses host-window dimensions. Specify a fixed viewport, DPR, and screenshot scale; keep browser and Playwright versions consistent when exact repeatability matters. - The reported screen dimensions seem unexpected after resizing.
page.setViewportSize()resets the page’sscreensize. Configure the context before creating pages when screen and viewport dimensions both need deliberate control. - The output looks insufficiently detailed. Confirm that the context has the intended
deviceScaleFactorand that the screenshot usesscale: 'device'. A larger viewport increases layout size; it is not the same as increasing pixel density.
Performance, repeatability, and file size
Viewport dimensions, page height, and output pixel density all affect the amount of image data captured. A tall full-page capture or a high-DPR image can therefore take more memory and produce a larger file than a viewport-only CSS-scale screenshot. For routine visual regression checks, use a fixed viewport and explicit scale: 'css' unless testing high-DPI rendering is the goal. Reserve higher DPR and full-page extent for cases that require them.
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For stable comparisons, record the viewport, DPR, scale, and whether full-page capture is enabled as part of the test setup. Also wait for the page state that matters to the test before capturing; resolution settings cannot compensate for a page that has not finished rendering. No single image dimension can be inferred from viewport alone when device-scale output or full-page capture is involved.
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Frequently Asked Questions
Does changing Playwright’s screenshot scale change the page layout?
No. The viewport controls layout dimensions; screenshot scale controls whether output pixels represent CSS pixels or device pixels.
Does a 1440 × 900 viewport guarantee a 1440 × 900 screenshot?
Only when the capture is viewport-only and uses CSS-pixel scale. Device-pixel scale and full-page capture can change the output dimensions.
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