To render images with html2canvas, make sure they have loaded before capture and that any image hosted on another origin permits browser CORS access. Set useCORS: true when the image server sends an appropriate Access-Control-Allow-Origin header. If it cannot, use a same-origin proxy. Then export the returned canvas with toBlob() or toDataURL().
Do not use allowTaint: true as an export fix: it may allow a foreign image to be painted, but the browser can still block reading the canvas. And remember that html2canvas reconstructs an image from DOM properties it understands; it is not a pixel-perfect screenshot of the browser.
What html2canvas does—and why images can be missing
html2canvas walks the DOM, reads supported properties, and draws a canvas representation. It does not capture the browser’s final composited pixels. The project documentation describes the result as based on the DOM and cautions that it may not exactly match the page as rendered in the browser.
That distinction matters for images. A browser may display an image normally while preventing JavaScript from reading its pixels. When html2canvas cannot load an image in a way that permits drawing, or skips it to protect the canvas, the exported result can be missing that image. Other causes include an image that has not loaded yet, an inaccessible cross-origin URL, or a layout whose dimensions do not include the full content.
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Start by separating two questions: can the browser display the image, and can script safely read pixels from it? Display alone does not establish permission for canvas export.
Fix cross-origin images with CORS or a proxy
Use CORS when the image host permits it
Images from the same origin as the page can be read by canvas. A cross-origin image requires permission from its server. If that server returns an appropriate Access-Control-Allow-Origin response header, set useCORS: true in the html2canvas options. For an image element that you manage directly, the browser’s CORS image-request pattern also uses a crossorigin attribute.
<img crossorigin="anonymous" src="https://images.example.com/photo.jpg" alt="Example">The image server’s response policy is decisive: adding the attribute or enabling useCORS does not grant permission by itself. If the server does not allow the page’s origin, the browser will not make the image readable to canvas.
Use a same-origin proxy when the image host cannot allow CORS
When you cannot change the image server’s headers, route the image through a proxy on your own origin. The proxy fetches the remote resource and returns it in a browser-loadable form, such as a base64 data URI. Pass the proxy URL using html2canvas’s proxy option. Build the proxy so it validates destinations and restricts what callers can fetch; an unrestricted proxy can be abused to request internal or unintended resources.
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A proxy adds a network hop and another component that can fail. Check that it returns the expected image content, handles errors and timeouts, and is reachable from the browser. Prefer server-side CORS configuration when you control the image host.
Why allowTaint is not an export workaround
allowTaint: true changes whether a tainted image may be drawn; it does not make the canvas readable afterward. Protected operations such as toDataURL(), toBlob(), and pixel reads can still fail on a tainted canvas. If the result must be exported or inspected, solve the origin restriction with CORS or a proxy instead.
Capture an element and export it as a PNG
Load html2canvas in your browser application before running this code, and replace #capture with the selector for the content to render. The element should be in the document and its images should be loaded before capture. The function returns a PNG Blob, which you can upload or download.
async function renderElementAsPng() {
const element = document.querySelector('#capture');
if (!element) {
throw new Error('Could not find #capture');
}
const images = Array.from(element.querySelectorAll('img'));
await Promise.all(images.map(image => {
if (image.complete) return Promise.resolve();
return new Promise(resolve => {
image.addEventListener('load', resolve, { once: true });
image.addEventListener('error', resolve, { once: true });
});
}));
const canvas = await html2canvas(element, {
useCORS: true,
scale: window.devicePixelRatio,
windowWidth: element.scrollWidth,
windowHeight: element.scrollHeight
});
return new Promise((resolve, reject) => {
canvas.toBlob(blob => {
if (blob) resolve(blob);
else reject(new Error('PNG export returned no blob'));
}, 'image/png');
});
}
renderElementAsPng()
.then(blob => {
const link = document.createElement('a');
link.href = URL.createObjectURL(blob);
link.download = 'capture.png';
link.click();
URL.revokeObjectURL(link.href);
})
.catch(error => console.error('Could not render the capture:', error));The image wait prevents the capture from starting while ordinary img elements are still loading. It does not fix a failed request or bypass CORS; inspect the browser’s Network and Console panels if an image is still absent. Applications that change image sources during rendering should wait for the final source, not merely for the original element to complete.
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Choose the dimensions deliberately
scale controls the output pixel density and defaults to window.devicePixelRatio. A larger scale can make text and images sharper, but it also increases canvas dimensions and memory use. width and height set output dimensions; windowWidth and windowHeight define the viewport used to evaluate styles and media queries. For a long element, matching the window dimensions to its scrollWidth and scrollHeight helps avoid rendering only the visible area.
These settings are not interchangeable. Changing the viewport can change responsive layout, while changing output width or height changes the canvas size. If a result is clipped, compare the element’s scroll dimensions, the chosen window dimensions, and the actual canvas dimensions before increasing scale.
Exclude controls and other unwanted nodes
For nodes you do not want included, add data-html2canvas-ignore to the element or use the ignoreElements option. This is useful for buttons, editing handles, or transient UI that should not appear in the output. Excluding an element does not make unsupported CSS or inaccessible image content render correctly.
Choose an export format and handle the result
After the html2canvas promise resolves, the returned value is a canvas. Use toBlob() when you need a binary file for upload or download. Use toDataURL('image/png') when a data URL is useful, such as for a small inline image. Data URLs encode the image into a string and can consume more memory than a Blob for larger captures. Either readback method can fail if the canvas is tainted, so resolve image-origin access before export.
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For a JPEG, request image/jpeg and supply a quality value supported by the browser; unlike PNG, JPEG does not preserve transparency. PNG is the straightforward choice for a lossless image with transparency. The browser’s canvas APIs determine the actual encoding behavior.
Diagnose blank, clipped, or inaccurate results
Blank output
- Confirm the selector matched a real element and that it has nonzero dimensions when capture begins.
- Wait for the application to finish rendering and for images to load. A completed page navigation does not necessarily mean later application content is ready.
- Check browser developer tools for blocked image requests, failed proxy responses, and JavaScript errors.
- Try a small same-origin image as a control. If it appears but a remote image does not, investigate the remote server’s CORS response.
Missing images or a tainted canvas
- For a foreign-origin image, confirm the image server allows the page’s origin with an appropriate CORS response header.
- Use
useCORS: truefor permitted remote images, or route images through a controlled same-origin proxy if the host cannot grant access. - Do not rely on
allowTaint: truewhen you need to export, upload, or read pixels from the canvas. - Check that redirects do not send the browser to a different host with different CORS behavior.
Clipped sections or unexpectedly small output
- Compare the element’s
scrollWidthandscrollHeightwith the configured window dimensions. - Check whether responsive styles or media queries change at the selected
windowWidthandwindowHeight. - Reduce
scaleif the capture is very large. Browser canvas size limits can cause blank or incomplete output, and the permitted maximum varies by browser and device.
Differences from the visible page
html2canvas only implements selected CSS properties, so its output can differ from the browser’s final rendering. Same-origin iframe content is supported recursively, but cross-origin iframe documents cannot be read through contentDocument and therefore cannot be rendered this way. Plugin content such as Flash or Java applets is not rendered. For content whose fidelity depends on browser-composited pixels or cross-origin frames, use a browser screenshot approach rather than expecting DOM reconstruction to reproduce it exactly.
Performance and reliability considerations
Captures run in the browser and depend on browser APIs including window and document; html2canvas is not a server-side renderer. Large pages and high pixel scales require more memory and time than small elements. Capture only the needed region, avoid needlessly high scale, and exclude UI that adds no value. If the page has asynchronous content, wait for a meaningful ready condition—such as the target element being present and its images finishing—rather than an arbitrary delay alone.
For repeatable output, keep viewport dimensions, device scale, and page state consistent. Treat third-party images as external dependencies: they can change, fail, redirect, or apply different access headers. A successful canvas render is not proof that every browser will produce identical pixels.
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Or skip the browser setup
If you need a screenshot of a public page rather than a canvas made from arbitrary in-memory DOM state, ScreenshotNeo can capture the page with one API request. It is a website screenshot API and MCP server; its browser capture is an alternative to setting up html2canvas, not a way to export an unsaved DOM state from your app. The API and its options are documented at ScreenshotNeo’s API documentation.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpThe same request in Python:
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)Or Node.js:
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);ScreenshotNeo accepts cookie or consent banners before capture and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each of those steps can be turned off. Bot checks and CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers report the page verdict and billing status. Its MCP server gives AI agents tools for screenshots, page information, and PDF capture. The Free plan includes 1,000 shots per month without a card; paid plans start at $5 for 3,000 shots. Every feature is available on every plan.
Create a free ScreenshotNeo account for 1,000 screenshots a month with no card.
Frequently Asked Questions
Can html2canvas capture a page on the server?
No. html2canvas runs in a browser context and depends on browser APIs such as window and document. Use a browser-based capture service or another server-side renderer when the capture must run without a user’s browser.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteWill html2canvas reproduce every CSS effect exactly?
No. It reconstructs the DOM using the CSS properties it implements, so the canvas may differ from the browser’s final composited page.
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