Use a DOM-to-canvas renderer, not the native Canvas API. For an arbitrary <div>, card, chart, or other HTML element, load html2canvas, pass the element to html2canvas(element), then export the returned canvas with toBlob(). The example below captures one element, waits for it to render, preserves device-pixel sharpness, and downloads a PNG without navigating away.
Complete vanilla JavaScript example
This is “vanilla JavaScript” at the application-code level: there is no framework, build step, or wrapper library. html2canvas is still required because browsers do not expose a general API that converts live HTML and CSS into pixels.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Element screenshot</title>
<script src="https://cdn.jsdelivr.net/npm/html2canvas@latest/dist/html2canvas.min.js"></script>
<style>
#capture { width: 420px; padding: 24px; background: white; color: #111; border: 1px solid #ddd; }
</style>
</head>
<body>
<section id="capture">
<h1>A card to capture</h1>
<p>Only this section becomes the image.</p>
<button data-html2canvas-ignore>Do not include me</button>
</section>
<button id="save" type="button">Download PNG</button>
<script>
document.querySelector('#save').addEventListener('click', async () => {
const element = document.querySelector('#capture');
if (!element) throw new Error('Target element was not found');
// Let web fonts and images finish before rendering.
if (document.fonts?.ready) await document.fonts.ready;
await Promise.all([...element.querySelectorAll('img')].map(img => {
if (img.complete) return Promise.resolve();
return new Promise(resolve => {
img.addEventListener('load', resolve, { once: true });
img.addEventListener('error', resolve, { once: true });
});
}));
const canvas = await html2canvas(element, {
scale: window.devicePixelRatio,
useCORS: true
});
const blob = await new Promise(resolve => canvas.toBlob(resolve, 'image/png'));
if (!blob) throw new Error('Canvas export failed');
const url = URL.createObjectURL(blob);
const link = document.createElement('a');
link.href = url;
link.download = 'capture.png';
link.click();
URL.revokeObjectURL(url);
});
</script>
</body>
</html>Save this as an HTML file and serve it from a local web server rather than opening it with a file:// URL. Click Download PNG; the section with id="capture" is rendered and downloaded. The data-html2canvas-ignore attribute excludes a node from the result.
Why native Canvas cannot screenshot a normal div
The native CanvasRenderingContext2D API draws pixels from sources such as an image, another canvas, an ImageBitmap, or video. Its drawImage() method can crop and scale those sources, but it does not interpret the browser’s layout tree, computed CSS, pseudo-elements, or fonts. A live div must first be reconstructed by a DOM renderer such as html2canvas.
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Use native canvas directly when the source is already an image or canvas. For example, this crops an existing image into a new file:
const source = document.querySelector('#source-image');
const crop = document.createElement('canvas');
crop.width = 400;
crop.height = 300;
crop.getContext('2d').drawImage(source, 20, 20, 400, 300, 0, 0, 400, 300);
crop.toBlob(blob => {
if (!blob) return;
const link = document.createElement('a');
link.href = URL.createObjectURL(blob);
link.download = 'crop.png';
link.click();
}, 'image/png');Do not confuse this image-cropping route with capturing HTML. It will not reproduce a styled card, table, or form unless those pixels already exist in an image or canvas.
Capture a selected element by CSS selector
Wrap the operation in a reusable function so any selector can be captured. Validate the selector result and return a real Blob, which is safer for large downloads than a giant data URL.
async function elementToPng(selector, filename = 'element.png') {
const element = document.querySelector(selector);
if (!element) throw new Error(`No element matches ${selector}`);
const canvas = await html2canvas(element, {
scale: window.devicePixelRatio,
useCORS: true,
backgroundColor: null
});
const blob = await new Promise(resolve => canvas.toBlob(resolve, 'image/png'));
if (!blob) throw new Error('PNG encoding failed');
const href = URL.createObjectURL(blob);
const anchor = Object.assign(document.createElement('a'), {
href,
download: filename
});
anchor.click();
setTimeout(() => URL.revokeObjectURL(href), 0);
}
document.querySelector('#save').onclick = () => elementToPng('.invoice-card', 'invoice.png');Geometry, scrolling and precise regions
element.getBoundingClientRect() returns the smallest rectangle containing the element, including padding and border. Its left, top, right, and bottom coordinates are relative to the viewport, so they change when the page scrolls. Add window.scrollX and window.scrollY to convert the top-left point to document coordinates.
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const box = element.getBoundingClientRect();
const documentX = box.left + window.scrollX;
const documentY = box.top + window.scrollY;
console.log({ x: documentX, y: documentY, width: box.width, height: box.height });For an element that is split across lines, such as an inline link, getClientRects() can return several rectangles. Decide whether your UI should capture the union of those rectangles or one particular fragment. Most block-level cards and panels need only getBoundingClientRect().
html2canvas can render a specific region with x, y, width, and height. Those options are useful when you need a crop around a larger rendered area, but passing the target element is usually simpler and preserves its natural box.
Sharp output and export formats
Device-pixel ratio
Set scale: window.devicePixelRatio for high-density displays. A 420 CSS-pixel-wide card on a device with a ratio of 2 becomes roughly 840 physical pixels wide, producing a sharper image. Very high ratios increase memory use; cap the value for large or numerous captures if the page becomes slow.
PNG, JPEG and WebP
PNG is the safest default for text, transparency and UI screenshots. You can request JPEG or WebP when supported:
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const blob = await new Promise(resolve =>
canvas.toBlob(resolve, 'image/jpeg', 0.88)
);The quality argument applies to lossy formats. If the requested format is missing or unsupported, browsers use PNG. Prefer toBlob() and an object URL for downloads. toDataURL() creates a base64 string in memory and can produce very large values that are awkward to store or place in a URL.
Images, fonts, iframes and CSS limitations
Cross-origin images
useCORS: true asks the renderer to load remote images with CORS. The image server must also send an appropriate Access-Control-Allow-Origin header. Without that permission, the image may be omitted or the canvas may become non-origin-clean; exporting it can then throw a SecurityError.
For assets you control, serve them from the same origin or configure CORS. A proxy is another option, but it must be designed carefully so it cannot be abused as an open request relay.
Fonts and loading state
Capture only after the visual state is complete. Await document.fonts.ready where available and wait for images, as in the complete example. If a web font is still downloading, the screenshot can contain fallback glyphs even though the page later looks correct.
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Iframes and unsupported CSS
html2canvas rebuilds a screenshot from DOM information; it does not take a literal browser screenshot. CSS properties that the renderer does not understand may differ from the live page. Cross-origin iframes cannot be read because their contentDocument is inaccessible. Same-origin iframes can be processed recursively. Complex filters, plugins, video overlays and browser UI are therefore not guaranteed to match.
Hide controls and prepare a capture-only view
Add data-html2canvas-ignore to buttons, toolbars, hover hints or other nodes that should not appear. For larger changes, temporarily add a class before rendering and remove it in a finally block:
async function captureWithoutToolbar() {
const target = document.querySelector('#report');
target.classList.add('capture-mode');
try {
return await html2canvas(target, { scale: window.devicePixelRatio });
} finally {
target.classList.remove('capture-mode');
}
}Keep the target’s dimensions stable while capturing. Animations, carousels, blinking cursors and lazy-loaded content can otherwise produce inconsistent frames. Pause them with a capture-only class or wait for the desired state.
Common failures and fixes
| Symptom | Likely cause | Fix |
|---|---|---|
html2canvas is not defined |
The script did not load, or the click happened first. | Check the browser network panel, keep the script before your code, and wait for page load. |
| Target is null | The selector is wrong or the script runs before the element exists. | Use the exact ID/class and run after the DOM is parsed. |
| Remote images are missing | The image server disallows CORS. | Host the asset on the same origin or configure CORS; useCORS cannot override server policy. |
SecurityError during export |
A cross-origin resource tainted the canvas. | Remove that resource, fix its CORS headers, or use a permitted proxy. |
| Text looks soft | Output scale is one CSS pixel per image pixel. | Use scale: window.devicePixelRatio, while monitoring memory. |
| Blank or incomplete capture | Fonts, images, lazy content or animations are still loading. | Await fonts and images, trigger lazy loading, pause motion, then capture. |
| Layout differs from the page | Unsupported CSS, cross-origin iframe, or a state that changed during rendering. | Simplify capture CSS, use same-origin frames, and freeze the visual state. |
| Browser freezes on large pages | High-resolution canvases consume substantial memory. | Capture only the element, reduce scale, avoid data URLs, and release object URLs. |
Performance, reliability and security considerations
- Capture the smallest useful node. Rendering the whole document costs more than rendering one card.
- Control pixel dimensions. Element width × height × scale² approximates the pixel workload; multiplying scale from 1 to 2 can require about four times as many pixels.
- Release resources. Revoke object URLs after the download and do not retain canvases or blobs unnecessarily.
- Do not treat a client-side image as trusted evidence. Users can alter the DOM before capture. For audit-grade records, render from a controlled server or store the original data as well.
- Protect sensitive content. The resulting image contains whatever the target displays. Avoid logging data URLs or uploading blobs without an explicit privacy policy.
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r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
r.raise_for_status()
open("shot.webp", "wb").write(r.content)const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`HTTP ${res.status}`);
const bytes = Buffer.from(await res.arrayBuffer());
require('fs').writeFileSync('shot.webp', bytes);ScreenshotNeo also provides element capture by CSS selector, full-page lazy-image loading, custom CSS and JavaScript, click-before-capture actions, waits for selectors or network idle, device presets and viewports, retina scale, headers, cookies, user agents, authorization, geolocation, timezone, request blocking, resizing, caching with a chosen TTL, signed links, asynchronous jobs with signed webhooks, bulk capture for up to 100 URLs per call, a usage API, OpenAPI, PDF controls and an MCP server with take_screenshot, get_page_info and capture_pdf for Claude, Cursor and other MCP clients.
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FAQ
Can I capture an element without any library?
Not as a general HTML-to-pixels operation. Native canvas can crop existing image or canvas sources, but arbitrary DOM and CSS require a renderer such as html2canvas or a browser automation service.
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Should I use toDataURL() for downloads?
Use toBlob() with an object URL for normal and large captures. Data URLs duplicate image data in a string and can become unwieldy.
Why does an inline element produce several boxes?
Inline content can wrap across lines. getClientRects() exposes each fragment; choose whether your UI needs one fragment or a union of them.
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