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Use the canvas that html2canvas() returns, encode it, and trigger an anchor download. The simplest PNG workflow is to await the Promise, call canvas.toDataURL('image/png'), set that value as an anchor’s href, provide a filename through download, and click the anchor. For large captures, encode a Blob and use an object URL instead.
The basic html2canvas download
html2canvas(element) does not return an image file. It returns a Promise that resolves to an HTML canvas. You must encode that canvas before the browser can download it.
async function downloadElementAsPng(element, filename = 'screenshot.png') {
const canvas = await html2canvas(element);
const link = document.createElement('a');
link.download = filename;
link.href = canvas.toDataURL('image/png');
link.click();
}
Call the function after a user action, such as a button click:
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const capture = document.querySelector('#capture');
downloadButton.addEventListener('click', async () => {
await downloadElementAsPng(capture, 'dashboard.png');
});
The download value is the suggested filename. Include the extension that matches the MIME type you request. If your page uses a strict Content Security Policy or a framework, keep the same sequence: await the render, encode the canvas, then initiate the anchor download from the event handler.
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Use toBlob() for larger images
A data URL contains the entire encoded image in a JavaScript string. That is convenient for small exports, but it can consume more memory for a large or full-page canvas. canvas.toBlob() writes the encoded result to a Blob; URL.createObjectURL() then gives the anchor a temporary URL.
async function downloadElementAsPng(element, filename = 'screenshot.png') {
const canvas = await html2canvas(element);
const blob = await new Promise(resolve => {
canvas.toBlob(resolve, 'image/png');
});
if (!blob) {
throw new Error('Canvas could not be encoded as PNG');
}
const url = URL.createObjectURL(blob);
const link = document.createElement('a');
link.download = filename;
link.href = url;
link.click();
// Leave the URL alive briefly so the browser can start the download.
setTimeout(() => URL.revokeObjectURL(url), 1000);
}
Do not revoke the object URL before the browser has had a chance to start the download. If you display the generated URL in an image or another control, keep it until that consumer no longer needs it, then call URL.revokeObjectURL().
Choose an export method
| Method | Best for | Trade-off |
|---|---|---|
toDataURL() plus an anchor |
Short, simple PNG downloads | Builds the complete image as a data URL in memory |
toBlob() plus an object URL |
Large captures and full-page exports | Requires asynchronous Blob handling and URL cleanup |
Both methods require an origin-clean canvas. Neither method can override browser security rules.
Control the capture and filename
Capture a specific element
Pass the element you want rendered instead of the whole document:
const panel = document.querySelector('.invoice');
const canvas = await html2canvas(panel);
Make sure the element has finished laying out before calling html2canvas. Fonts, images, and dynamically inserted content that have not loaded yet can change the result.
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Give each download a useful name
const filename = `invoice-${new Date().toISOString().slice(0, 10)}.png`;
await downloadElementAsPng(document.querySelector('#invoice'), filename);
Sanitize user-provided text before placing it in a filename, and avoid path separators. The browser controls the final save location and may adjust the suggested name.
Request another image format
The canvas encoder accepts a MIME type, for example 'image/jpeg' or 'image/webp' where the browser supports it:
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const dataUrl = canvas.toDataURL('image/jpeg', 0.9);
Support is browser-dependent. If the requested type is not supported, toDataURL() can return PNG instead. Inspect the returned data URL’s MIME prefix when the exact format matters, and keep the filename extension consistent with the actual result.
Fix tainted-canvas and missing-image errors
Why remote images disappear
html2canvas reconstructs a representation from DOM and CSS information; it is not a literal browser screenshot. A remote image can make the canvas tainted when the image server does not grant cross-origin access. A tainted canvas cannot be read with toDataURL() or toBlob().
Enable CORS when the image host allows it
If the image server sends an appropriate Access-Control-Allow-Origin response header, request CORS-aware loading:
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const canvas = await html2canvas(element, { useCORS: true });
useCORS is false by default. The option only works when the remote server is configured to allow your origin (or otherwise permits the request). Check the image request in browser developer tools and verify its response headers.
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When the image host does not send the required header, serve the image through a server-side proxy that you control and configure that proxy to return suitable CORS headers. Do not assume that setting allowTaint: true makes export possible; it does not make a tainted canvas readable under browser security rules.
Cross-origin iframes
html2canvas cannot render the contents of a cross-origin iframe when browser security prevents your page from accessing that document. You can capture the iframe element’s surrounding layout, but not secretly read and redraw its protected contents. A capture service that loads the target page itself is a different approach.
Understand what the output represents
The project describes html2canvas as allowing “screenshots” of webpages or parts of them directly in the user’s browser, while clarifying that it renders from DOM information rather than taking an actual screenshot. It only implements the CSS and browser features it understands. Pixel-for-pixel parity with the visible browser window is therefore not guaranteed.
- Unsupported CSS or unusual browser effects may be absent or look different.
- Images and other resources must be available at capture time.
- Layout changes between the initial page render and the call can appear in the result.
- A successful Promise means a canvas was produced, not that every visual resource was reproduced exactly.
Make downloads reliable in production
Wait for content before rendering
Call html2canvas only after the component is mounted and its content is ready. For application-generated images, wait for the image’s load event before capturing. If your UI changes state immediately before the click, wait for the next render cycle so the DOM reflects that state.
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Handle failures explicitly
downloadButton.addEventListener('click', async () => {
downloadButton.disabled = true;
try {
await downloadElementAsPng(document.querySelector('#capture'));
} catch (error) {
console.error('Screenshot export failed', error);
alert('The screenshot could not be exported. Check remote images and try again.');
} finally {
downloadButton.disabled = false;
}
});
Keep the failure path visible to the user. A rejected render Promise, a null Blob, or a security exception should not leave the interface permanently disabled.
Reduce memory pressure
- Prefer the Blob/object-URL path for very large canvases.
- Capture the smallest necessary element instead of an entire page when possible.
- Release object URLs after the download has started.
- Avoid retaining old canvases and data URLs in application state.
Troubleshooting checklist
| Symptom | Likely cause | Fix |
|---|---|---|
SecurityError from toDataURL() or toBlob() |
The canvas is tainted by cross-origin content | Use useCORS: true only when the image server sends the required CORS header; otherwise proxy the asset |
| Images are missing | Resources are cross-origin, not loaded yet, or blocked | Inspect network requests, wait for loading, and configure CORS or a proxy |
| The downloaded file is PNG despite another requested type | The browser does not support the requested encoder | Inspect the data URL MIME type and use the matching extension |
| The result does not match the browser exactly | html2canvas is a DOM/CSS reconstruction | Check supported rendering features and simplify unsupported effects |
| The button appears to do nothing | The Promise rejected or the download was blocked by the surrounding code | Add try/catch, log the error, and trigger the anchor from the user event |
| Large exports freeze the tab | Encoding a very large data URL creates memory pressure | Use toBlob(), capture a smaller element, and release object URLs |
Or skip the browser setup
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cURL
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FAQ
Does html2canvas save a file by itself?
No. It resolves to a canvas. Your code must encode that canvas and initiate the download.
Can I export a cross-origin image with JavaScript alone?
Not when the image server denies cross-origin access. The server must allow CORS, or the image must be supplied through a suitable proxy.
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Frequently Asked Questions
Does html2canvas save a file by itself?
No. It resolves to a canvas; your code must encode the canvas and initiate the download.
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