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To save a specific <div> as an image in a web app, use html2canvas to render the element into a canvas, then download that canvas as a PNG. This is a browser-side reconstruction of the element—not a pixel-perfect screenshot—and cross-origin images or unsupported CSS can affect the result.
Save a div as a PNG with html2canvas
The basic flow is: select the element, render it with html2canvas, turn the resulting canvas into a data URL, and trigger a download. Install and import html2canvas using the package setup appropriate for your project; the project’s getting-started guide documents passing an element to the function.
import html2canvas from 'html2canvas';
async function saveDivAsPng() {
const element = document.querySelector('#capture');
if (!(element instanceof HTMLElement)) {
throw new Error('Could not find the element to capture.');
}
const canvas = await html2canvas(element);
const link = document.createElement('a');
link.download = 'capture.png';
link.href = canvas.toDataURL('image/png');
link.click();
}
document.querySelector('#save-button')?.addEventListener('click', () => {
saveDivAsPng().catch((error) => {
console.error('Image export failed:', error);
});
});In this example, the page contains an element with id="capture" and a button with id="save-button". If your project loads the library another way, keep the function and adapt the import. Run the capture in response to a user action, such as clicking the save button, and give the output a useful filename.
Wait until the content is ready
If the div contains data, fonts, or images loaded asynchronously, capture it only after those resources and the content have settled. Otherwise the canvas may reflect an earlier state, before the visible page is complete. A selector check is also important: passing a missing element cannot produce the intended capture.
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What html2canvas captures—and what it does not
html2canvas reads the DOM and builds a canvas-based representation using the styles and content it understands. It does not simply take a screenshot of the browser’s pixels. As the html2canvas project documentation explains, “As a result, it is only able to render correctly properties that it understands, meaning there are many CSS properties which do not work.” Check the output for your particular layout, especially when it uses complex styling.
- CSS fidelity: Supported properties and rendered appearance depend on the library’s implementation. Consult the supported-features documentation for the version installed in your app, and test the exact styles the element uses.
- Cross-origin iframes: The project documentation says cross-origin iframes cannot be rendered because the page cannot access their documents.
- Remote images: The browser’s canvas security rules apply. A remote image must be served with suitable CORS permission if it is to be included in an exportable canvas.
- Browser differences: The project lists current evergreen browsers, but compatibility does not mean every CSS feature or page will render identically across browsers.
For a requirement that the image exactly match the browser’s rendered pixels, DOM reconstruction may not be the right technique. Consider a browser screenshot workflow instead. That captures a page through a browser process, but it has different setup and security trade-offs from generating a canvas in the page.
Handle cross-origin images and canvas export errors
A canvas that includes pixels from an image the page is not allowed to read becomes “tainted.” In that state, the browser blocks export methods including toDataURL() and toBlob(). MDN Web Docs states: “Attempting any of these when the canvas is tainted will cause a SecurityError to be thrown.”
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For remote images that you need in the PNG, the html2canvas FAQ recommends trying useCORS: true when the image server sends the required CORS headers, or using a proxy when it does not. For example:
const canvas = await html2canvas(element, {
useCORS: true
});useCORS: true asks the library to load images using CORS; it cannot grant permission that the remote server has not provided. If the server does not allow the request, use an image source you control or a correctly configured proxy. Do not rely on allowTaint: true to make a tainted canvas downloadable: allowing tainted content does not bypass the browser’s restriction on reading or exporting those pixels.
Choose output scale, background, and capture size
Capture options affect the image’s dimensions and appearance. Check the configuration reference for the version of html2canvas in your dependency rather than assuming an option or default is identical across versions.
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| Need | Option or approach | What to consider |
|---|---|---|
| More pixels for a high-density display | scale |
The examples use scale: window.devicePixelRatio. A higher scale creates a larger canvas, so choose it based on the intended display or downstream use. |
| Transparent rather than white surroundings | backgroundColor: null |
The options reference describes white as the configured default. Transparency also depends on the element’s styling and what the renderer supports. |
| Control the rendering viewport | windowWidth and windowHeight |
These settings can affect appearance and dimensions. Use values appropriate to the layout you want rendered and verify the result. |
For example, a higher-density capture can be requested like this:
const canvas = await html2canvas(element, {
scale: window.devicePixelRatio
});This is a size trade-off, not a guarantee of improved visual fidelity: increasing the pixel dimensions cannot add support for a CSS property the renderer does not implement. Large canvases also require more memory, so avoid an unnecessarily high scale.
Download as JPEG or WebP instead
PNG is the straightforward lossless choice for a general-purpose export. The canvas API also accepts formats such as JPEG and WebP through toDataURL(), where supported by the browser. For JPEG, specify a quality value between 0 and 1 if you want to control compression:
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const dataUrl = canvas.toDataURL('image/jpeg', 0.9);
const link = document.createElement('a');
link.download = 'capture.jpg';
link.href = dataUrl;
link.click();JPEG does not preserve transparency. Select the format based on whether the image needs a transparent background, broad compatibility, or smaller compressed output, and test it in the browsers your app supports.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Alternative workflow: render the div yourself
If the element consists of simple graphics, a direct canvas implementation can give you control over drawing and export without reconstructing arbitrary page CSS. This works best when you own the rendering logic and can draw each shape, text block, and image into the canvas yourself. It is not a drop-in method for capturing any existing styled div: you must reproduce the desired content and layout in drawing operations.
For an existing web page where the target is a particular DOM element, html2canvas is more direct. For an exact browser-rendered view, use a browser screenshot process. Choose according to whether you need DOM-based element selection, full rendered-page fidelity, or a custom drawing you control.
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Troubleshooting common export failures
The download does nothing
- Confirm that the selector matches an element and that the capture function runs after the save button is clicked.
- Check the browser console for a rejected capture promise or a security exception.
- Make sure the canvas is created before reading its data URL;
html2canvasis asynchronous.
Images are missing
- Wait for the image content to load before calling
html2canvas. - For images hosted on another origin, check that the server returns suitable CORS headers and try
useCORS: true. - If the image host does not permit CORS, use a permitted proxy or a source you control. The browser will not allow a tainted canvas to be exported.
The exported design differs from the page
- Check whether the relevant CSS properties are supported by the installed html2canvas version.
- Verify the configured scale, background color, and viewport dimensions against the desired output.
- Remember that the library reconstructs from DOM and styles rather than copying the browser’s pixels; for unsupported styling or embedded content, use a different rendering approach.
The image has a white background
White is the configured default in the options reference. Try backgroundColor: null if you need transparency, then confirm that the element and renderer preserve the transparent areas you expect.
The canvas throws a SecurityError
Look for cross-origin images in the captured element. The failure means the canvas cannot be read or exported under the browser’s security rules. The fix is to obtain valid CORS permission from the asset host or route the asset through an appropriately configured proxy—not to set allowTaint and expect unrestricted downloads.
Or skip the browser setup
If you need a screenshot of a published page rather than a particular local DOM node, ScreenshotNeo can return an image from one API request. It captures a URL, not an arbitrary div selected in your app; use html2canvas when the div itself is the required target. See the ScreenshotNeo API documentation.
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Frequently Asked Questions
Can I save a div as SVG with html2canvas?
html2canvas produces a canvas representation for raster-image export; this workflow does not create a vector SVG of the element.
Can html2canvas capture a div on another website?
It operates on a DOM element the page can access. Browser same-origin restrictions prevent a page from reading another origin’s document, including a cross-origin iframe.
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