Set deviceScaleFactor in page.setViewport() before navigating, then capture the page with page.screenshot(). For example, a 1280 × 800 CSS-pixel viewport at a scale factor of 2 requests a high-density capture:
await page.setViewport({
width: 1280,
height: 800,
deviceScaleFactor: 2,
});
await page.goto('https://example.com');
await page.screenshot({ path: 'page.png', fullPage: true });The viewport settings determine page metrics; screenshot options determine the captured area and file format. See Puppeteer’s viewport API and screenshot guide.
What deviceScaleFactor changes
deviceScaleFactor is a viewport setting that emulates the device pixel ratio. Set it alongside the viewport’s width and height with page.setViewport(). The values for width and height are CSS pixels; increasing the scale factor requests a higher-density image for that emulated viewport. The official API documents the setting, but does not promise a universal output-quality improvement or fixed resource cost at any particular scale factor. Check the rendered result in your own application when exact dimensions or appearance matter.
Set the viewport before navigation when possible. Puppeteer notes that viewport changes can cause a page reload in some cases, and sites may respond to viewport metrics. See Page.setViewport().
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Capture a high-resolution screenshot
Basic full-page capture
This complete example uses Puppeteer’s current documented API pattern. It opens a page, configures its viewport, navigates, and saves a PNG:
import puppeteer from 'puppeteer';
const browser = await puppeteer.launch();
try {
const page = await browser.newPage();
await page.setViewport({
width: 1280,
height: 800,
deviceScaleFactor: 2,
});
await page.goto('https://example.com', { waitUntil: 'networkidle0' });
await page.screenshot({ path: 'page.png', fullPage: true });
} finally {
await browser.close();
}Replace the URL with the page you need. The viewport is 1280 × 800 CSS pixels; fullPage: true asks Puppeteer to capture the full page rather than only the viewport. The screenshot guide shows path-based output and the Page.screenshot() API documents the capture method.
Capture only the visible viewport
Omit fullPage, which defaults to false, to capture the viewport-sized area:
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await page.screenshot({ path: 'viewport.png' });Capture a selected region or element
Use the screenshot option clip when you need a rectangle instead of the full page or viewport. For a DOM element, locate it and use its screenshot() method:
const chart = await page.$('#chart');
if (!chart) throw new Error('Could not find #chart');
await chart.screenshot({ path: 'chart.png' });Puppeteer documents element capture in its screenshot guide. The ScreenshotOptions reference describes clip as the selected region; clipping and full-page capture are screenshot choices, not viewport settings.
Choose dimensions, format, and capture extent
- Viewport dimensions: Set
widthandheightinsetViewport()to choose the emulated page layout size in CSS pixels. - Pixel density: Set
deviceScaleFactorin that same viewport configuration. Choose a factor appropriate to the output you need; the official API does not specify a universal best value. - Capture extent: Use the default viewport capture,
fullPage: true,clip, orElementHandle.screenshot(), depending on the portion needed. - Output format: Puppeteer can infer the type from the filename extension, or accept an explicit screenshot
type. PNG does not use thequalityoption; that option is not applicable to PNG.
These are distinct decisions: viewport metrics affect page emulation, while screenshot options govern what is saved and how. Refer to ScreenshotOptions for the documented options.
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Viewport emulation is not headless screen configuration
page.setViewport() configures metrics for a page. Puppeteer’s screen configuration guide covers the browser’s headless display separately. Changing the available screen is not a substitute for setting the page’s deviceScaleFactor. Use the configuration that matches the behavior you are trying to reproduce, and consult Screen configuration when the browser display itself is relevant.
Troubleshooting
The image is not the dimensions I expected
Check whether you measured CSS pixels or image pixels, and whether you requested a viewport, full-page capture, clip, or element screenshot. The scale factor belongs in the viewport configuration; the capture extent belongs in screenshot options. The docs establish these separate controls but do not guarantee a single output dimension for every page and capture mode.
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The site renders in the wrong layout
Set width, height, and scale factor before goto(). A site can adapt its layout to viewport changes, and Puppeteer notes that certain viewport changes may reload a page. If you change viewport settings after navigation, allow the page to settle and verify the resulting layout.
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The PNG looks unchanged after setting quality
The screenshot quality option does not apply to PNG. Select an appropriate output type if you need a format where quality is applicable, or keep PNG and omit that option.
The screenshot only contains part of the page
For a full-page image, pass fullPage: true. If you intentionally need a portion, check the dimensions and position in clip, or capture the target element directly.
Or skip the browser setup
If you need a screenshot without managing Puppeteer and a browser, ScreenshotNeo provides a screenshot API and MCP server. One GET request returns an image or PDF; its options include device presets, viewport sizing, and retina scale.
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Example cURL request (see the ScreenshotNeo documentation):
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com -o shot.webpScreenshotNeo accepts cookie and consent banners and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each cleanup step can be turned off. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and responses identify the page verdict and billing status in headers. Its MCP server offers take_screenshot, get_page_info, and capture_pdf for AI agents. The Free plan includes 1,000 shots per month with no card; paid plans start at $5 for 3,000 shots.
Sign up for ScreenshotNeo’s free plan to get 1,000 screenshots a month with no card.
Frequently Asked Questions
Does deviceScaleFactor replace width and height?
No. Set it alongside the viewport width and height in page.setViewport(); it does not define the viewport dimensions.
Can I use deviceScaleFactor with an element screenshot?
Yes. Configure the page viewport with page.setViewport(), then call the target element’s screenshot() method.
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