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The shortest reliable TypeScript solution is Playwright: launch a browser, set a deliberate viewport, wait for the page, and call page.screenshot({ type: 'png' }). Give the call a path to write a file, or omit it to receive PNG bytes as a Node.js Buffer. Use fullPage: true for the complete scrollable document and a locator’s screenshot() method for one element.
Set up a TypeScript screenshot project
This guide targets a Node.js TypeScript program using Playwright. Install the package and browser binaries in your project:
npm install playwright
npx playwright installYour TypeScript configuration should support modern ECMAScript modules or CommonJS consistently with the way you run the file. The examples use top-level await; place them in an ESM module, or wrap them in an async function.
Capture a webpage as a PNG file
This complete example fixes the viewport, waits for network activity to settle, writes a PNG, and always closes the browser:
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import { chromium } from 'playwright';
const browser = await chromium.launch();
try {
const page = await browser.newPage({
viewport: { width: 1440, height: 900 },
});
await page.goto('https://example.com', { waitUntil: 'networkidle' });
await page.screenshot({
path: 'page.png',
type: 'png',
});
} finally {
await browser.close();
}page.screenshot() returns a promise. PNG is the default format when no other format is inferred, but specifying type: 'png' makes the intent explicit. The resulting file is created relative to the process’s current working directory; use an absolute or project-relative path when your build runs from a different directory.
Choose the capture scope
Full-page PNG
A normal screenshot covers the current viewport. To capture the entire scrollable document, set fullPage: true:
await page.screenshot({
path: 'full-page.png',
fullPage: true,
type: 'png',
});Full-page mode is appropriate for long articles, landing pages, and invoices. It can create a very tall image, so consider whether a viewport shot or a PDF is more useful for your consumer.
One element
Use a locator when you need a card, chart, header, or invoice rather than the whole page:
const invoice = page.locator('.invoice');
await invoice.screenshot({
path: 'invoice.png',
type: 'png',
});The locator must resolve to a visible element. If a selector matches multiple nodes, make it specific or select one item explicitly. Element capture and fullPage are different modes: choose the element’s screenshot method for a component, and page screenshot with fullPage for the document.
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Keep the PNG in memory
Omit path when you need to upload, hash, transform, or return the image from an API:
const pngBytes = await page.screenshot({ type: 'png' });
// pngBytes is a Node.js Buffer
await fs.promises.writeFile('copy.png', pngBytes);Import Node’s file module if you also want to persist those bytes:
import fs from 'node:fs';With an HTTP framework, send the buffer with a PNG content type rather than converting it to a base64 string unnecessarily.
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The viewport determines CSS layout and the screenshot’s logical dimensions. Set it before navigation so responsive breakpoints select the intended design:
const page = await browser.newPage({
viewport: { width: 1280, height: 800 },
});Playwright’s scale option controls output density. scale: 'css' produces one output pixel per CSS pixel and is useful when image dimensions must remain stable. scale: 'device' uses device pixels and can produce a larger, high-DPI image. Choose one policy and keep it fixed for reproducible files.
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await page.screenshot({
path: 'retina.png',
type: 'png',
scale: 'device',
});The screenshot API also accepts a capture timeout. Set it when a stalled page should fail within a known window rather than waiting indefinitely.
Wait for the page that users actually see
waitUntil: 'networkidle' can help on pages whose important resources load after the initial response, but it is not a universal readiness test. Analytics, polling, advertisements, and WebSockets may keep a page active forever. For application pages, wait for a semantic signal such as a heading, table, or chart:
await page.goto('https://example.com/dashboard', {
waitUntil: 'domcontentloaded',
});
await page.locator('[data-testid="dashboard-ready"]').waitFor();
await page.screenshot({ path: 'dashboard.png', type: 'png' });If content appears after a known interaction, perform it before capture. A short, purposeful delay can be used for an animation or lazy component, but a selector-based wait is generally less fragile.
Make captures repeatable
Disable moving content
Animated cursors, carousels, timestamps, random recommendations, and blinking carets cause pixel differences between runs. Inject a style sheet during capture and hide or freeze the parts that are not relevant to the image:
await page.screenshot({
path: 'stable.png',
type: 'png',
style: `
*, *::before, *::after {
animation: none !important;
transition: none !important;
caret-color: transparent !important;
}
`,
});For visual-test baselines, generate and compare images in the same operating system, browser version, browser settings, hardware conditions, power mode, and headless configuration. Those environmental factors can change rendered pixels even when your code is identical.
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Always clean up
Put browser.close() in a finally block, as in the first example. This prevents orphaned browser processes when navigation, a selector wait, or the screenshot itself throws. For a service that captures many URLs, reuse a browser process where practical, create isolated pages or contexts per job, and close each page after its job.
Alternative: Puppeteer in TypeScript
Puppeteer provides the same basic workflow and is a natural choice when the rest of your automation already uses it:
import puppeteer from 'puppeteer';
const browser = await puppeteer.launch();
try {
const page = await browser.newPage();
await page.goto('https://example.com', { waitUntil: 'networkidle2' });
await page.screenshot({
path: 'page.png',
type: 'png',
fullPage: true,
});
} finally {
await browser.close();
}Puppeteer’s screenshot API can return bytes, and its encoding: 'base64' option returns a base64 string. It also supports element screenshots through an element handle. Pick Playwright when you want its documented Chromium, Firefox, and WebKit coverage, locator ergonomics, or Playwright Test’s screenshot assertions; pick Puppeteer when it best matches your existing browser-automation stack. Both produce PNG files and in-memory data.
Use screenshots in visual regression tests
Playwright Test includes expect(page).toHaveScreenshot(). PNG is the default snapshot format. Keep the test environment controlled and make the page deterministic before the assertion:
import { test, expect } from '@playwright/test';
test('home page visual baseline', async ({ page }) => {
await page.goto('https://example.com', { waitUntil: 'domcontentloaded' });
await page.locator('main').waitFor();
await expect(page).toHaveScreenshot('home.png');
});Do not treat a changed pixel as automatically a product regression. Browser updates, operating-system rendering, font availability, hardware, power source, and headless mode can all affect pixels. Review intentional changes and regenerate baselines only in the environment your team has selected as the reference.
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Common failures and fixes
Blank or partially rendered image
- Cause: the screenshot ran before client-side content or lazy images appeared.
- Fix: wait for a page-specific selector, scroll if the application lazy-loads on scroll, or use
networkidleonly when the page can reach network idle.
Navigation timeout
- Cause: a third-party request, long poll, or unreachable resource never reaches the selected wait condition.
- Fix: use
domcontentloadedplus a readiness selector, and set an explicit navigation timeout appropriate to your workload.
Locator screenshot fails
- Cause: the selector matches nothing, more than one unexpected element, or a hidden element.
- Fix: confirm the selector in the page, wait for it, narrow it to one node, and make sure it is visible before calling
screenshot().
Output dimensions are surprising
- Cause: no fixed viewport, a responsive breakpoint, or device-pixel scaling.
- Fix: set
viewportexplicitly and choose eitherscale: 'css'orscale: 'device'deliberately.
Fonts or images differ between machines
- Cause: missing fonts, different browser/OS rendering, or resources blocked by authentication or network policy.
- Fix: install the required fonts, use the same browser image in CI, verify credentials and resource requests, and compare only controlled environments.
Browser processes remain after errors
- Cause: cleanup is skipped on an exception.
- Fix: close the browser in
finally; for workers, also close pages and contexts after each job.
Or skip the browser setup
ScreenshotNeo is a website screenshot API and MCP server. One GET request returns a PNG, JPEG, WebP, or PDF. It accepts the cookie or consent banner like a visitor, then removes more than 60 known consent platforms, newsletter popups, and chat widgets before the capture; each cleanup step can be turned off. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits cost nothing, and the response identifies the result with X-Page-Verdict and X-Billed headers.
PNG capture from TypeScript can be a single HTTP call:
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
const png = Buffer.from(await res.arrayBuffer());See the ScreenshotNeo documentation for authentication, response handling, and the complete option set. The same endpoint is callable from cURL:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpOr from Python:
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)ScreenshotNeo includes full-page capture with lazy images loaded, CSS-selector element capture, dark mode, 12 device presets plus custom viewports, retina scale, PDF paper and page controls, HTML/CSS-to-image, custom CSS and JavaScript, pre-capture clicks, hidden selectors, selector/delay/network-idle waits, ad/tracker/request/resource blocking, custom headers/cookies/user agents and Authorization, timezone and geolocation, transparent backgrounds, resizing, configurable-TTL caching, signed public image links, asynchronous jobs with signed webhooks, bulk capture of 100 URLs per call, a usage API, an OpenAPI specification, and compatibility with parameter names used by other screenshot APIs. Its MCP server exposes take_screenshot, get_page_info, and capture_pdf to Claude, Cursor, and other MCP clients.
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FAQ
Can Playwright save JPEG or WebP instead of PNG?
Yes. Set type: 'jpeg' or type: 'webp' in page.screenshot(). Use PNG when lossless text and transparency matter.
Should I use a full-page screenshot for a very long page?
Only when one tall image is genuinely required. Long outputs consume more memory and may be awkward to display; capture a viewport, selected elements, or a PDF when those formats fit the use case better.
How do I upload the in-memory result?
Omit path, retain the returned Buffer, and pass it to your storage or HTTP client’s binary upload method with a Content-Type of image/png.
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