To capture several divs with html2canvas, either capture their shared parent once or select each div and call html2canvas() for it. The function captures one element per call and returns a Promise for a canvas. Use Promise.all() when you need separate canvases at the same time; draw those canvases onto a second canvas if you need one combined image.
Choose between capturing a wrapper and capturing each div
The right approach depends on whether you need to preserve the page’s arrangement or handle each result separately. html2canvas reconstructs a rendering from DOM information; it is not a direct screenshot of the browser’s pixels.
| Approach | Best when | Layout and output | Trade-off |
|---|---|---|---|
| Capture a shared wrapper | The divs belong together and should appear as they do in the page layout. | One canvas representing the wrapper and its rendered layout. | You have less independent control over the output position and size of each div. |
| Capture each div separately | You need separate images, or want to position the results yourself. | One canvas per selected div; you can append them or composite them. | You must decide the output arrangement and account for canvas memory and dimensions. |
If preserving the spacing, alignment, and other relationships between elements is more important than getting separate files, capture their common parent. If you need independent outputs or a custom arrangement, capture each element.
Capture multiple divs as separate canvases
Load html2canvas in a browser-based application, select the elements, and await a call for each one. The official getting-started documentation describes the result as a Promise that resolves with a canvas element.
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Runnable browser example
In your HTML, give the divs a shared selector and provide a destination element for the output:
<div class="capture">First panel</div>
<div class="capture">Second panel</div>
<div id="results"></div>In a browser JavaScript module where html2canvas is installed and available to the bundler, capture each matching element:
import html2canvas from '@html2canvas/html2canvas';
async function captureDivs() {
const divs = [...document.querySelectorAll('.capture')];
const result = document.querySelector('#results');
if (!result) {
throw new Error('Missing #results element');
}
if (divs.length === 0) {
throw new Error('No elements matched .capture');
}
const canvases = await Promise.all(
divs.map((div) =>
html2canvas(div, {
backgroundColor: null,
scale: window.devicePixelRatio,
useCORS: true,
})
)
);
result.replaceChildren(...canvases);
return canvases;
}
captureDivs().catch((error) => {
console.error('Could not capture the divs:', error);
});The selector determines which elements are captured, and the array order is the order in which the canvases are returned. Promise.all() lets the capture operations proceed asynchronously and resolves to an array in that same input order. If any capture rejects, the combined Promise rejects; handle that error rather than assuming all canvases were produced.
The example appends canvases to the page so you can inspect them. To download, upload, or display them elsewhere, use the export or composition methods below. If your divs need the exact spacing and relative placement already present in the page, replace the loop with one call on their common wrapper:
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if (!wrapper) throw new Error('Missing #capture-wrapper');
const canvas = await html2canvas(wrapper, { useCORS: true });Combine separate captures into one image
Capturing multiple elements returns multiple canvases; it does not automatically merge them. To create one image, make a destination canvas, calculate its size for the arrangement you want, and draw each source canvas at the appropriate coordinates.
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Stack captures vertically
This example places the results one below another, using the widest source canvas as the destination width. It assumes the canvases have already been captured.
function stackVertically(canvases) {
if (canvases.length === 0) {
throw new Error('No canvases to combine');
}
const width = Math.max(...canvases.map((canvas) => canvas.width));
const height = canvases.reduce((sum, canvas) => sum + canvas.height, 0);
const destination = document.createElement('canvas');
destination.width = width;
destination.height = height;
const context = destination.getContext('2d');
if (!context) throw new Error('Could not create a 2D canvas context');
let y = 0;
for (const canvas of canvases) {
context.drawImage(canvas, 0, y);
y += canvas.height;
}
return destination;
}For a horizontal row, use the maximum source height as the destination height, sum the source widths, and advance an x coordinate by each canvas’s width after drawing. For a grid or custom layout, calculate each position explicitly. Canvas width and height are in pixels: when using a high-DPI scale, use the resulting canvas dimensions rather than assuming they equal the elements’ CSS dimensions.
Do not let a source canvas extend beyond the destination canvas: the excess will be clipped. A transparent destination is useful when the result should retain transparency. If you want a solid background, fill the destination canvas before drawing the sources.
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Use the canvas API to produce a PNG data URL or a Blob. A Blob is generally the more practical choice for large images or uploads because a base64 data URL can consume substantial memory.
Download as PNG
function downloadCanvas(canvas, filename = 'capture.png') {
canvas.toBlob((blob) => {
if (!blob) {
console.error('Canvas export failed');
return;
}
const link = document.createElement('a');
const objectUrl = URL.createObjectURL(blob);
link.href = objectUrl;
link.download = filename;
link.click();
URL.revokeObjectURL(objectUrl);
}, 'image/png');
}Call downloadCanvas(destination) for a composite, or call it with an individual returned canvas. If another API requires a data URL, use canvas.toDataURL('image/png') for a modest output, but prefer toBlob() for larger files.
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Options that control what gets captured
Pass options as the second argument to html2canvas(element, options). These settings affect the rendered output, the selected area, and whether external resources can appear.
scale: Controls output resolution. The default is the browser’s device-pixel ratio; explicitly settingwindow.devicePixelRatiois a documented high-DPI pattern. A higher scale produces more pixels and can increase memory use and the risk of reaching browser canvas-size limits.backgroundColor: Set tonullto preserve transparency when the captured content has no background. Choose a color when you want a solid background.x,y,width, andheight: Define the capture region. Check that the requested crop matches the element’s position and the output you intend; a crop that excludes content will produce an apparently cut-off result.useCORS: Attempts to load cross-origin images using CORS. It cannot make an image readable if the image server does not permit the request.proxy: Can load permitted cross-origin resources through a proxy that returns them as same-origin data. The proxy must be configured to retrieve those resources; this is not a way to bypass browser content restrictions.ignoreElementsanddata-html2canvas-ignore: Exclude elements such as buttons, selection handles, or other UI that should not appear in the output.onclone: Adjusts the temporary cloned document used for rendering. Use it for capture-specific changes without altering the live page.windowWidthandwindowHeight: Control the viewport used for media queries and off-screen layout. If output is clipped because the rendered viewport is too small, align these values with the page’s scroll dimensions.
For multiple divs, pass the options to each call, or pass them to the single wrapper capture. A setting that changes one element’s appearance can also affect the result when capturing the larger parent.
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Remote images are missing or the canvas cannot be exported
Cross-origin images are subject to browser content policy. The project’s official FAQ states, “html2canvas cannot circumvent content policy restrictions set by your browser.” Set useCORS: true only when the remote server sends suitable CORS headers. If the resource is permitted and you control the setup, a proxy that returns it as same-origin data may help. Without the necessary permission, the image may be omitted or the canvas may be tainted so it cannot be read or exported.
An iframe’s content is absent
Cross-origin iframes cannot be rendered through html2canvas because the browser does not allow access to their contentDocument. Capturing the parent element does not remove that restriction. If the iframe is on another origin, use an approach that has legitimate access to that content rather than expecting html2canvas to read it.
The result is cut off
- Check that you selected the intended element or wrapper and that its layout includes all of the content.
- Review
x,y,width, andheightif you set a crop. - For off-screen content or media-query differences, check
windowWidthandwindowHeight; the rendering viewport may need to match the relevant scroll dimensions. - When combining canvases, verify that the destination dimensions include every source canvas and that each draw position is correct.
The output is blank or truncated on a very large page
Browsers impose canvas-size limits. A capture that exceeds them can be blank or truncated. Capture smaller regions or elements separately and composite them, while keeping the destination canvas within a manageable size. Splitting reduces the size of individual captures but does not guarantee that an enormous final composite will fit; its own dimensions still matter.
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The wrong elements appear, or an element is missing
Check that querySelectorAll() matches the elements you intend to capture. If controls or overlays should be excluded, use ignoreElements or mark them with data-html2canvas-ignore. For capture-only styling, make changes in onclone so the live document is not changed.
The code runs in Node.js but no image is produced
html2canvas relies on browser APIs and is not a Node.js screenshot renderer. Run it in a browser context with a rendered document. If the requirement is to capture a live website from a server-side request, use a browser-based rendering service or API instead.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Performance, reliability, and implementation choices
Every captured element produces a canvas, and each canvas uses memory proportional to its pixel dimensions. Capturing at a higher scale or capturing many large elements can increase memory use. If you only need the page’s combined visual appearance, capturing a shared wrapper avoids creating a separate output canvas for every div. If you need individual assets, keep the captures limited to the elements and resolution you actually need.
Parallel calls through Promise.all() are concise and preserve element order in the resulting array, but all requested results remain in memory for composition or export. For a large set of elements, capture in smaller batches and release references to canvases when they are no longer needed. If one operation fails, handle the rejected Promise and decide whether the application should report the failure or retry after correcting the underlying cause.
html2canvas is best suited to browser-side captures of content the page can render and access. It does not override CORS restrictions, gain access to cross-origin iframe documents, or replace a browser screenshot engine in Node.js. For large outputs, consider splitting the work, choosing an appropriate scale, and exporting with a Blob.
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Frequently Asked Questions
Does html2canvas capture multiple divs with one call?
One call captures one element. To preserve the arrangement of several divs, pass their shared parent to one call; otherwise, make one call per div.
Can html2canvas capture a cross-origin iframe?
No. The browser prevents access to a cross-origin iframe’s document, so html2canvas cannot render its contents.
Can I use html2canvas as a Node.js website screenshot tool?
No. It relies on browser APIs and is intended for browser-side rendering, not as a Node.js screenshot engine.
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