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How to Set Screenshot Viewport Size and Device Scale Factor in Puppeteer

Set Puppeteer’s viewport in CSS pixels before navigation, adjust deviceScaleFactor, and choose whether to capture the viewport, full page, or a clipped region.
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Set the page’s viewport with page.setViewport() before navigating, then capture it with page.screenshot(). The width and height are CSS pixels; use deviceScaleFactor in the same viewport object to control the emulated rendering scale.

Set the viewport and scale factor

This runnable example opens a browser, sets a 1280 × 720 CSS-pixel viewport at a device scale factor of 2, loads a page, and saves a PNG screenshot:

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const puppeteer = require('puppeteer');

(async () => {
  const browser = await puppeteer.launch();
  try {
    const page = await browser.newPage();

    await page.setViewport({
      width: 1280,
      height: 720,
      deviceScaleFactor: 2,
    });

    await page.goto('https://example.com', { waitUntil: 'networkidle2' });
    await page.screenshot({ path: 'page.png' });
  } finally {
    await browser.close();
  }
})();

Install Puppeteer in your project first with npm install puppeteer. The viewport values control the page’s layout dimensions in CSS pixels; deviceScaleFactor sets the emulated device scale factor. Its documented default is 1. A factor of 2 requests rendering at twice that scale, which is useful when you want a higher-density screenshot. Puppeteer Viewport interface

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Why the order matters

Call page.setViewport() before page.goto() when you need the first render to use the target dimensions. Some sites respond unexpectedly to viewport changes, and changing isMobile or hasTouch can cause a reload in some cases. Puppeteer Page.setViewport() method

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Choose what the screenshot includes

Viewport configuration and screenshot extent are separate choices. If you omit both fullPage and clip, the screenshot covers the current viewport. Use fullPage: true to request the full page, or clip to capture a rectangle.

// Full page
await page.screenshot({ path: 'full.png', fullPage: true });

// A region, in screenshot clip coordinates
await page.screenshot({
  path: 'region.png',
  clip: { x: 40, y: 80, width: 600, height: 400 },
});

For an element-specific capture, Puppeteer also provides ElementHandle.screenshot(); it attempts to scroll a hidden element into view by default. Puppeteer Screenshots guide

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Control output format and background

The screenshot options determine how the capture is saved, independently of the viewport:

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  • path writes the file; without it, the screenshot is not saved to disk. When a path is supplied, its extension determines the image type.
  • type selects the format and defaults to PNG.
  • quality applies to supported lossy formats, not PNG.
  • omitBackground defaults to false; set it to true when you want to omit the default background.
  • fromSurface defaults to true.

See the documented ScreenshotOptions interface for option details and supported values.

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Set a default viewport for new pages

If every page opened through a connection should use the same default, configure defaultViewport in the connection options. Puppeteer documents its default as 800 × 600 CSS pixels. Set it to null to disable that default viewport behavior. For one-off captures or pages with different dimensions, page.setViewport() is the direct page-level option; multiple pages in one browser can each have their own viewport. Puppeteer ConnectOptions interface

Common mistakes and fixes

  • The layout does not match the requested size: confirm that you set width and height before navigation. These dimensions are CSS pixels, not physical monitor pixels.
  • The image is not saved: supply a path to page.screenshot(). Without one, Puppeteer does not save the image to disk.
  • The screenshot includes only the visible viewport: add fullPage: true for a full-page capture, or use clip for a specific rectangle.
  • Changing the viewport causes unexpected site behavior: set it before navigation. Be especially mindful when changing mobile or touch emulation settings, which can trigger a reload in some cases.
  • A quality setting has no effect: quality does not apply to PNG; use a supported lossy format if you need that option.
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For a 1280 × 720 capture at scale 2, use the documented ScreenshotNeo API options alongside this one-call request:

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curl -G "https://api.screenshotneo.com/v1/shot" 
  -d access_key=YOUR_API_KEY 
  --data-urlencode url=https://example.com 
  -d width=1280 
  -d height=720 
  -d device_scale_factor=2 
  -o shot.webp

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