Use a browser-automation library and enable its full-page option. In Playwright, the essential call is await page.screenshot({ path: 'fullpage.png', fullPage: true }); in Puppeteer, use the same fullPage: true option. Both capture the page’s scrollable content rather than only the visible viewport. Set the viewport before navigation, wait for dynamic content, and inspect the output when pages load material on scroll.
What “full-page” means
A normal screenshot records the current browser viewport. A full-page screenshot renders the entire scrollable document as one image, including content below the fold. It is not a photograph of a physically tall monitor, and it does not by itself guarantee that every asynchronous component or lazy image has finished loading.
The examples below use Node.js. Install one library in your project, run the browser it supports, and write the image to disk or keep the returned bytes in memory for further processing.
Playwright: the recommended implementation
Install and run
npm install playwrightPlaywright can download its supported browsers with:
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npx playwright installconst { chromium } = require('playwright');
(async () => {
const browser = await chromium.launch();
const page = await browser.newPage({
viewport: { width: 1280, height: 800 }
});
await page.goto('https://example.com', {
waitUntil: 'networkidle'
});
await page.screenshot({
path: 'fullpage.png',
fullPage: true
});
await browser.close();
})();fullPage: true tells Playwright to capture the full scrollable page. The path determines where the file is saved; change the extension or add type: 'jpeg' or type: 'webp' when you need another format supported by your installed version.
Wait for content that appears later
“Network idle” is only one readiness signal. For a page that renders a dashboard after an API call, wait for the actual component:
await page.goto('https://example.com/dashboard');
await page.locator('[data-testid="report"]').waitFor();
await page.screenshot({ path: 'report.png', fullPage: true });For lazy-loaded pages, scroll through the document before capturing so scroll-triggered requests run:
await page.goto('https://example.com/catalog');
await page.evaluate(async () => {
await new Promise(resolve => {
const step = 500;
const timer = setInterval(() => {
window.scrollBy(0, step);
if (window.innerHeight + window.scrollY >= document.body.scrollHeight) {
clearInterval(timer);
resolve();
}
}, 100);
});
});
await page.waitForTimeout(500);
await page.screenshot({ path: 'catalog.png', fullPage: true });Use a site-specific selector or a measured delay instead of assuming that one universal wait handles every application. Check the resulting image for missing sections.
Capture into a buffer
const image = await page.screenshot({ fullPage: true });
// image is a Buffer: send it to storage, compare pixels, or transform it.
require('fs').writeFileSync('fullpage.png', image);A buffer is useful when the image should be uploaded directly or compared without creating an intermediate file.
Controlling layout, scale, and output
Viewport and responsive breakpoints
Define width and height before navigation. Responsive sites choose their layout from the viewport available during page load, so setting it afterward can produce a different design. A fixed viewport also makes repeated captures comparable:
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const page = await browser.newPage({
viewport: { width: 1440, height: 900 },
deviceScaleFactor: 1
});Choose the width that represents the reader or test target. A narrow width may activate a mobile menu; a wide width may expose a desktop navigation bar.
CSS pixels versus device pixels
Playwright’s screenshot scale option accepts 'css' or 'device'. CSS scale produces one image pixel per CSS pixel and generally keeps files smaller. Device scale preserves the emulated device’s pixel density and can produce a larger, higher-density image. Select one consistently when doing visual comparisons.
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await page.screenshot({
path: 'css-scale.png',
fullPage: true,
scale: 'css'
});Masking, styling, and formats
For deterministic review images, hide volatile elements with CSS before capture:
await page.addStyleTag({
content: '.live-clock, . rotating-ad { visibility: hidden !important; }'
});
await page.screenshot({
path: 'stable.png',
fullPage: true,
type: 'png'
});Replace the selector with valid selectors from your page. Playwright also supports screenshot options for masking, temporary styles, quality (for lossy formats), and timeouts; consult its current Page API for the exact option names supported by your installed release.
Puppeteer alternative
Install and capture
npm install puppeteerconst puppeteer = require('puppeteer');
(async () => {
const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.setViewport({ width: 1280, height: 800 });
await page.goto('https://example.com', { waitUntil: 'networkidle0' });
await page.screenshot({
path: 'fullpage.png',
fullPage: true
});
await browser.close();
})();Puppeteer documents fullPage as a Boolean that defaults to false; explicitly setting it to true is therefore important. Its screenshot options also include path, image type, JPEG quality, clipping, and background-related controls.
Viewport emulation
Puppeteer’s viewport settings can include width, height, device scale factor, mobile behavior, touch support, and orientation. Set them before goto when the responsive layout matters:
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await page.setViewport({
width: 390,
height: 844,
deviceScaleFactor: 2,
isMobile: true,
hasTouch: true
});As with Playwright, wait for the selector that proves your application is ready and trigger scroll-based loading before taking the final image.
Choosing between Playwright and Puppeteer
| Need | Choice | Reason |
|---|---|---|
| Existing Playwright tests or multi-browser automation | Playwright | Reuse the same page, locator, waiting, and browser setup. |
| Existing Puppeteer code | Puppeteer | Its page.screenshot API directly exposes full-page capture and familiar Chromium controls. |
| Pixel comparisons or uploads | Either | Both can save a path; Playwright explicitly supports returning image data for buffer workflows. |
| Reproducible responsive images | Either | Set viewport and scale before navigation and keep those values fixed. |
The libraries expose similar capture concepts. Your project’s existing automation stack is usually the deciding factor.
Common failures and fixes
The image stops at the viewport
Cause: fullPage was omitted or set to false. Fix: pass fullPage: true in the screenshot call.
Sections or images are missing
Cause: the page inserts content after navigation or only loads it when scrolled. Fix: wait for a target selector, scroll through the document, allow its requests to finish, and capture again.
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Cause: the viewport was not set before navigation, or the chosen width crossed a responsive breakpoint. Fix: create the page with the intended viewport (or call Puppeteer’s setViewport) before goto.
Output files are unexpectedly huge
Cause: a very tall document combined with device-pixel scaling or a lossless format. Fix: use scale: 'css' in Playwright, choose JPEG/WebP when appropriate, or capture a specific element rather than the entire document.
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The process hangs or the browser will not start
Cause: a browser binary is missing, a sandbox restriction applies in the runtime, or a navigation never reaches the selected wait condition. Fix: install the library’s browser binaries, use the launch settings required by your deployment environment, and replace an overly strict network-idle wait with a concrete readiness selector plus a bounded timeout.
Sticky headers appear repeatedly or obscure content
Cause: fixed-position elements remain visible while the full document is composed. Fix: temporarily hide or restyle those selectors with a stylesheet, or capture the relevant content element instead of the whole page.
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- Pin library and browser versions in your project so rendering changes are intentional.
- Use a dedicated output name per URL, viewport, and revision to avoid overwriting evidence.
- Close the browser in a
finallyblock in production jobs so failures do not leak processes. - Record the URL, viewport, scale, timestamp, and readiness condition alongside the image.
- Inspect unusually tall pages for blank sections, repeated fixed elements, and content that appears only after interaction.
- For authenticated pages, establish the session with the library’s context or cookies before navigation and avoid placing secrets in screenshot filenames or logs.
Or skip the browser setup
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import requests
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r.raise_for_status()
open("shot.webp", "wb").write(r.content)Node.js
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FAQ
Does full-page capture include content hidden behind a “load more” button?
No. Automation captures what the document has rendered. Click the control and wait for its resulting content before calling the screenshot method.
Can I capture only one element?
Yes. In browser automation, use the library’s element screenshot API; this avoids producing a very tall document when only a component is needed. ScreenshotNeo also accepts a CSS selector for element capture.
Why do two captures of the same URL differ?
Responsive breakpoints, animations, rotating ads, timestamps, personalized data, and asynchronous requests can all change pixels. Fix the viewport and readiness condition, disable or hide volatile elements, and compare like-for-like runs.
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Can a full-page screenshot be returned without writing a file?
Yes. Playwright returns a Buffer when no path is supplied, and Puppeteer can likewise return screenshot data for in-memory processing.
Is a PDF the same as a full-page PNG?
No. A PNG or JPEG is one image representing the scrollable document; a PDF applies paper dimensions, margins, orientation, and pagination.
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