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Take a WebP Screenshot of a Webpage in Node.js with Playwright

A practical Node.js guide to saving webpage screenshots as WebP with Playwright, including file and Buffer output, quality, full-page and element capture, and visual tests.
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Use Playwright’s page.screenshot() with type: 'webp'. Set a .webp file path to save the image, or omit path to get the encoded image bytes as a Node.js Buffer.

Install Playwright and save a WebP screenshot

In a new project, install Playwright with npm install playwright. Playwright also needs its browser binaries; install Chromium with npx playwright install chromium. Then save this as screenshot.js and run node screenshot.js:

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const { chromium } = require('playwright');

(async () => {
  const browser = await chromium.launch();
  try {
    const page = await browser.newPage();
    await page.goto('https://example.com');
    await page.screenshot({ path: 'screenshot.webp', type: 'webp' });
  } finally {
    await browser.close();
  }
})();

The output file is screenshot.webp. The explicit type makes the intended format clear; Playwright can also infer the format from the path extension. PNG is the default if you do not specify a type or an extension that selects another format.

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Choose the capture and encoding options

File path or Buffer

Use path: 'screenshot.webp' when you want Playwright to write the screenshot to disk. To process or upload the image in your program instead, omit path; page.screenshot() resolves to a Buffer containing the encoded image:

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const image = await page.screenshot({ type: 'webp', quality: 80 });
// image is a Buffer; pass it to the library or upload code you use.

Lossless or lossy WebP

WebP’s quality option accepts values from 0 to 100. The documented value 100 produces a lossless WebP image; lower values use lossy compression. The default is 100. Choose a lower value only if lossy output is acceptable for your use case. File-size savings depend on the page and settings, so measure your own captures rather than assuming a particular reduction.

Viewport, full page, and pixel scale

By default, Playwright captures the current viewport. Set fullPage: true to capture the full scrollable page:

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await page.screenshot({
  path: 'full-page.webp',
  type: 'webp',
  fullPage: true
});

The scale option controls the output pixel dimensions. scale: 'css' produces one image pixel per CSS pixel; scale: 'device' captures device pixels and is the default. Device-scale output can have more pixels and a larger file, particularly on high-density displays.

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Capture one element

For a specific element, use a locator’s screenshot method rather than capturing the whole page. Playwright scrolls the element into view before capturing it:

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await page.locator('#report').screenshot({
  path: 'report.webp',
  type: 'webp'
});

For a scrollable container, the screenshot includes only the content currently scrolled into view; it does not automatically stitch the container’s entire scrollable contents.

Stabilize captures

Playwright screenshot options let you disable animations and apply a stylesheet to hide or alter dynamic elements. These controls can make captures more repeatable, but they do not make rendering identical across different operating systems, browser versions, hardware, settings, power sources, or headless modes. Keep those conditions consistent when comparing images.

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Use WebP for a visual regression test

If the screenshot is a test snapshot rather than an image you simply want to save, use Playwright Test’s expect(page).toHaveScreenshot('landing.webp'). WebP snapshots are supported and documented as lossless. Screenshot assertions wait for two consecutive screenshots to match before comparing the result, and they require the Playwright test runner.

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Run snapshot generation and comparison in a consistent rendering environment. Differences in operating system, browser version, settings, hardware, power source, and headless mode can change rendering and produce visual differences unrelated to your code.

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Troubleshooting

  • The script cannot launch Chromium: install the browser binary with npx playwright install chromium after installing the Playwright package.
  • The output is PNG instead of WebP: specify type: 'webp' or use a .webp path. PNG is the default format.
  • You expected a file but got no file: check that the screenshot call includes path. Without it, the result is returned as a Buffer and must be handled by your code.
  • The capture cuts off below the fold: the default is viewport-only. Add fullPage: true for a page-wide capture.
  • A visual test changes between runs or machines: standardize the browser and rendering environment; screenshot assertions do not eliminate environment-dependent rendering differences.
  • The image is larger than expected: check whether device-pixel scaling is producing more pixels than CSS-pixel scaling, and consider a lower lossy quality setting if your use case allows it. Measure the resulting output on representative pages.

Or skip the browser setup

If you need an endpoint rather than managing Playwright and Chromium, ScreenshotNeo returns a screenshot or PDF from one GET request. Its options include WebP output. See the ScreenshotNeo API documentation for request parameters.

curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webp

ScreenshotNeo accepts cookie and consent banners before capture and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each step can be turned off. Bot checks and CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers say which page verdict applied and whether the request was billed. Its MCP server provides screenshot and page-information tools for AI agents. The free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000 shots.

Sign up for ScreenshotNeo’s free plan.

Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.

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