Use html2canvas when code running in the page should turn a DOM element into a downloadable PNG. Use Playwright or Puppeteer when a server must capture the browser’s actual rendered output, including a full page or a selected element. Browser extensions should use their native tab-capture APIs.
The distinction matters: html2canvas rebuilds an image from DOM and style information; it does not photograph the browser’s rendered pixels. That makes it convenient, but unsupported CSS, cross-origin resources, iframes and very large canvases can change or prevent the result.
Choose the capture method first
Your execution environment and fidelity requirement determine the right JavaScript approach. This table puts a service option first, followed by code you run yourself.
| Option | Best for | Important limitation or reason |
|---|---|---|
| ScreenshotNeo (#1 service/API) | Production captures without maintaining a browser | Removes consent banners, popups and chat widgets before capture; only clean shots are billed, and the lowest paid plan is $5. |
| html2canvas | An element in the current page from client-side JavaScript | Returns a canvas reconstructed from DOM and CSS; fidelity depends on supported properties and resource access. |
| Playwright | Server-side full-page or element screenshots | Controls a real browser, so it is suitable when rendered output matters; you must run a browser process. |
| Puppeteer | Server-side browser automation and screenshots | Also controls a real browser and exposes page screenshot APIs; browser setup is required. |
| Native extension screenshot API | A browser extension capturing a tab | Use the browser’s capture API rather than a canvas library; native APIs are more reliable for extensions and avoid canvas-size limits. |
Convert an element in the current page with html2canvas
Install and load the library
For a bundled application, install the package with your package manager:
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npm install html2canvasThen import it in your browser-side module. A script-tag setup can load the project’s browser build instead. The important requirement is that this code executes where window, document and computed styles exist.
Minimal PNG download
Give the area you want to capture an identifier, wait until its content is visible, and call the Promise-based API:
import html2canvas from 'html2canvas';
const element = document.querySelector('#capture');
if (!element) {
throw new Error('Missing #capture element');
}
const canvas = await html2canvas(element);
const link = document.createElement('a');
link.download = 'webpage.png';
link.href = canvas.toDataURL('image/png');
link.click();html2canvas(element) resolves to a canvas. toDataURL('image/png') encodes that canvas as a PNG data URL, and the temporary anchor starts the download. This is a representation assembled from the page’s DOM information, not an actual screenshot of browser pixels.
Crop, scale and control the capture
Use html2canvas options when the whole element is not the desired output. The project examples support crop coordinates and an explicit scale. A higher scale can make text sharper, but it also increases memory use and the final file size.
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const element = document.querySelector('#capture');
const canvas = await html2canvas(element, {
x: 0,
y: 0,
width: element.scrollWidth,
height: element.scrollHeight,
scale: window.devicePixelRatio
});
const link = document.createElement('a');
link.download = 'capture@2x.png';
link.href = canvas.toDataURL('image/png');
link.click();Capture after fonts, images and asynchronous data have finished loading. If the element is scrollable, use its full scroll dimensions for the requested region; if the page is extremely large, capture smaller sections instead of assuming one unlimited canvas will work.
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Why the image may not match the page
CSS support is selective
html2canvas understands a subset of CSS. Properties it does not implement, unusual effects and browser-specific rendering can produce differences from what you see on screen. Treat it as a convenient DOM renderer, not a pixel-equivalence tool. If exact browser rendering is a requirement, use a real-browser capture with Playwright or Puppeteer.
Cross-origin images and canvas security
Images loaded from another origin can taint the canvas or be omitted under browser content-policy rules. Setting useCORS: true helps only when the image server sends the appropriate CORS response header:
const canvas = await html2canvas(document.querySelector('#capture'), {
useCORS: true
});A configured proxy is another documented option, but it must be a server you trust and control carefully. A client-side library cannot bypass browser security policy. Do not disable those protections or assume that adding useCORS grants access to every remote image.
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Same-origin frames can be rendered recursively. A cross-origin frame is inaccessible to page JavaScript, as is a sandboxed frame without allow-same-origin; its contents therefore cannot be reconstructed by html2canvas.
Very large pages
Canvas dimensions have browser- and platform-dependent limits. Oversized captures can be blank or only partly rendered, and there is no universal maximum that applies to every browser. Reduce the region, lower the scale, or capture a sequence of sections when a large page fails.
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Capture the rendered page with Playwright
Playwright launches a real browser, loads the URL and uses the browser’s screenshot implementation. This is the server-side choice when CSS fidelity, JavaScript execution, lazy loading or a full scrollable page matters.
Full-page Node.js example
Install Playwright and its browser according to the project’s current setup instructions, then run a script such as:
import { chromium } from 'playwright';
const browser = await chromium.launch();
const page = await browser.newPage({
viewport: { width: 1440, height: 900 },
deviceScaleFactor: 1
});
await page.goto('https://example.com', { waitUntil: 'networkidle' });
await page.screenshot({ path: 'page.png', fullPage: true });
await browser.close();fullPage: true extends the image through the page’s full scrollable height. For one component, locate it and screenshot the element instead:
const card = page.locator('#capture');
await card.screenshot({ path: 'card.png' });Wait for a selector or other application-specific readiness condition when network idle is not enough. For pages that lazy-load images, scroll or trigger the page’s own loading behavior before taking the screenshot.
Capture with Puppeteer
Puppeteer offers the same basic real-browser model. Its screenshot API can save a viewport or full page:
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import puppeteer from 'puppeteer';
const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.setViewport({ width: 1440, height: 900 });
await page.goto('https://example.com', { waitUntil: 'networkidle0' });
await page.screenshot({ path: 'page.png', fullPage: true });
await browser.close();Use a real browser when the target is outside your current page, when cross-origin content must render as the browser sees it, or when a server job needs repeatable capture. Browser automation consumes more startup time and resources than an in-page canvas call, so reuse a browser process for batches rather than launching one for every URL.
Browser-extension captures
If the code runs in a browser extension and the goal is a visible tab, use the extension’s native screenshot API (for example, the documented captureVisibleTab() family) with the permissions and browser rules for that extension. The html2canvas FAQ recommends native APIs for extensions because they are more reliable and are not constrained by canvas-size limits.
Make captures dependable
Before calling the API
- Wait for web fonts, images and client-rendered data that must appear.
- Choose a stable viewport and device scale factor for automation.
- Hide transient UI such as menus or animations when those are not part of the desired image.
- For html2canvas, verify that remote images provide the CORS headers you need.
- For large documents, plan a sectioned capture or a real-browser full-page screenshot.
Common failures and fixes
| Symptom | Likely cause | Fix |
|---|---|---|
| External images are missing or the export throws a security error | Cross-origin content tainted the canvas | Serve the images with the required CORS header and use useCORS: true, or use a trusted proxy. Otherwise use Playwright or Puppeteer. |
| Fonts, shadows or layout differ from the tab | Unsupported CSS or DOM reconstruction | Switch to a real-browser screenshot for pixel fidelity; simplify unsupported effects only if html2canvas is required. |
| An iframe is blank | The frame is cross-origin or sandboxed without same-origin access | Capture the frame from its own origin or use browser automation with appropriate access; page JavaScript cannot read it directly. |
| The image is blank or truncated | The requested canvas exceeds a browser/platform limit | Lower scale, reduce the region, or capture several smaller images. |
Node.js reports that window or document is undefined |
html2canvas is client-side only | Run it in a browser, or use Playwright/Puppeteer on the server. |
| The screenshot contains a loading spinner or missing lazy images | Capture started before the page was ready | Wait for a selector or application state, then capture; in automation, explicitly exercise lazy-loading behavior. |
Performance, reliability and output decisions
html2canvas avoids browser-launch overhead and is a good fit for an interactive “download this card” button. Its work and memory usage grow with the captured area and scale. Browser automation is heavier, but it executes the same layout and painting pipeline users see and is easier to centralize in a server workflow. Reuse browser instances for batches, cap concurrency to the resources available, and write files as they complete rather than holding many large buffers in memory.
PNG is lossless and preserves text and flat UI graphics. The example above intentionally exports PNG because that is the documented download pattern. If your product needs another format, check the canvas and browser APIs you support and test quality, transparency and file size on representative pages.
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cURL
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpPython
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)Node.js
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
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ScreenshotNeo supports full-page capture with lazy images loaded; a single element by CSS selector; dark mode; 12 device presets or any viewport; retina scale; PDF paper size, margins, landscape and page ranges; HTML/CSS-to-image; custom CSS and JavaScript; clicking an element before capture; hidden selectors; waits for a selector, delay or network idle; blocking ads, trackers, requests or resource types; custom headers, cookies, user agent and Authorization; timezone and geolocation; transparent backgrounds; image resizing; caching with a chosen TTL; signed links for public <img> tags; asynchronous jobs with signed webhooks; bulk capture of up to 100 URLs per call; a usage API; an OpenAPI specification; and compatibility with parameter names used by other screenshot APIs.
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Does html2canvas send my page to a remote service?
The library runs in the browser context where you call it. Your own application decides whether to upload the resulting canvas or keep the generated image locally.
Can I use both approaches in one product?
Yes. A client-side html2canvas preview can provide an immediate download for simple elements, while a server-side Playwright job handles pages that require full browser fidelity or cross-origin rendering.
What do ScreenshotNeo’s X-Page-Verdict and X-Billed headers tell me?
They identify how the response was classified and whether it counted as a billed clean screenshot, including non-billed outcomes such as failed loads or cache hits.
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