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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallhtml2canvas returns a canvas, not a Base64 string. Wait for the promise, call canvas.toDataURL('image/png'), then use the returned data URL as an image source or as a download link. For large captures, export with toBlob() and create a temporary object URL instead of building a very large in-memory string.
Open an html2canvas Base64 image in the browser
The shortest working pattern captures an element, converts the resulting canvas to a PNG data URL, and opens that URL in a new tab:
const canvas = await html2canvas(document.querySelector('#capture'));
const dataUrl = canvas.toDataURL('image/png');
window.open(dataUrl, '_blank');The value returned by toDataURL() already includes its media type and Base64 payload, for example data:image/png;base64,.... Do not prepend another data:image/png;base64, string.
If the browser blocks a new tab because the call happens outside a user gesture, display the result in the current document or create the tab synchronously from a click handler. The html2canvas project describes this as a reconstructed “screenshot”: it reads DOM and CSS information rather than copying the browser’s literal pixels. See the official examples and documentation.
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Display the result in an <img> element
Assign the data URL directly to src. This is useful for a preview, a gallery, or replacing the captured element with its rendered image.
async function showCapture() {
const element = document.querySelector('#capture');
const canvas = await html2canvas(element);
const dataUrl = canvas.toDataURL('image/png');
const image = new Image();
image.alt = 'Screenshot of the captured content';
image.src = dataUrl;
image.style.maxWidth = '100%';
document.querySelector('#preview').replaceChildren(image);
}
showCapture().catch(console.error);Example markup:
<div id="capture">Content to render</div>
<div id="preview"></div>Use image.onload if later code needs the displayed dimensions. The image can be styled normally because a data URL is a valid image source.
Download the Base64 image as a PNG
Create an anchor, put the data URL in href, set download, and activate it. This follows the project’s official download example.
async function downloadCapture() {
const canvas = await html2canvas(document.querySelector('#capture'));
const dataUrl = canvas.toDataURL('image/png');
const link = document.createElement('a');
link.download = 'capture.png';
link.href = dataUrl;
link.click();
}
downloadCapture().catch(console.error);Call this from a button’s click handler when possible:
document.querySelector('#download').addEventListener('click', () => {
downloadCapture().catch(error => console.error('Capture failed:', error));
});The download attribute is a filename suggestion. Browser security rules and cross-origin navigation policies can affect downloads in unusual embedding situations, but same-origin pages generally follow this pattern.
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Use a Blob URL for large captures
toDataURL() encodes the entire image into a JavaScript string. That string can consume substantial memory and may hit browser URL-length limits. For a large or full-page capture, use toBlob(), then create an object URL:
async function downloadLargeCapture() {
const canvas = await html2canvas(document.querySelector('#capture'));
canvas.toBlob((blob) => {
if (!blob) {
console.error('The browser could not create an image blob.');
return;
}
const objectUrl = URL.createObjectURL(blob);
const link = document.createElement('a');
link.download = 'capture.png';
link.href = objectUrl;
link.click();
URL.revokeObjectURL(objectUrl);
}, 'image/png');
}
downloadLargeCapture().catch(console.error);Revoke the object URL after the link has been activated so the browser can release the associated memory. If you need the URL for a visible preview, revoke it only after the image has loaded and is no longer needed.
Choose PNG, JPEG, or another format
PNG is the default and required export format for toDataURL(). You may request another MIME type:
const jpegUrl = canvas.toDataURL('image/jpeg', 0.85);
const webpUrl = canvas.toDataURL('image/webp', 0.85);The second argument is a quality hint for lossy formats. If a requested type is unsupported, the browser falls back to PNG, so inspect the beginning of the returned string when the format matters. Transparent pixels are preserved by PNG; JPEG has no transparency and is usually smaller for photographic content.
Capture the right area and dimensions
Pass the element you want to render:
const element = document.querySelector('.invoice');
const canvas = await html2canvas(element, {
backgroundColor: '#ffffff'
});For content that extends beyond the visible viewport, set capture dimensions from the element’s scroll area:
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const element = document.querySelector('#capture');
const canvas = await html2canvas(element, {
windowWidth: element.scrollWidth,
windowHeight: element.scrollHeight
});These options influence html2canvas’s DOM reconstruction; they do not bypass browser canvas limits. Extremely wide or tall canvases can be truncated or empty. Check canvas.width and canvas.height before exporting.
Cross-origin images, CORS, and tainted canvases
Images loaded from another origin must grant permission through suitable CORS response headers if you want html2canvas to read them. A client-side option alone cannot override the browser’s same-origin policy.
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useCORS: true
});useCORS: true works only when the image server permits the requesting origin, typically with an Access-Control-Allow-Origin response header. If the remote server does not provide CORS, serve the asset from your own origin or use a server-side proxy that you control and configure safely. Cross-origin iframes remain inaccessible to browser JavaScript.
A tainted canvas may still appear on screen, but reading it with toDataURL() or toBlob() can throw a security exception. Fix the resource policy rather than trying to add a second Base64 prefix.
Why the output is blank, incomplete, or different
Blank output or data:,
MDN documents data:, when a canvas has zero width or height or when its dimensions exceed the browser’s maximum canvas size. Confirm that the selected element exists, is laid out, and has non-zero dimensions. Reduce scale or split a very large capture into sections.
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Images or fonts are missing
Wait until assets have loaded before calling html2canvas. Cross-origin resources need CORS permission, and inaccessible fonts or images cannot be read. A delayed capture can help with late-rendering content, but it cannot grant access to blocked resources.
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html2canvas approximates the page from DOM and CSS data. Unsupported CSS, browser differences, animations, and inaccessible resources can change the result. Freeze animations, hide transient controls, and capture after the layout has settled. It is not a pixel-perfect browser compositor or a way to capture cross-origin iframe pixels.
The canvas is cut off
Inspect the requested dimensions and browser limits. Use the element’s scroll dimensions through windowWidth and windowHeight, but avoid creating a canvas larger than the browser can allocate. For long documents, capture logical sections separately and combine them on the server or in an image editor.
The download does nothing
Check the console for a security exception, make sure the function runs after a user gesture, and verify that the data URL is non-empty. Switch to the Blob approach if the data URL is too large. Do not revoke an object URL before the browser has had a chance to start the download.
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This page captures a card, previews it, and downloads a PNG while reporting failures:
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<button id="save" type="button">Save card</button>
<section id="card">
<h1>Quarterly report</h1>
<p>Revenue and expenses</p>
</section>
<div id="preview"></div>
<script type="module">
import html2canvas from 'https://cdn.jsdelivr.net/npm/[email protected]/+esm';
document.querySelector('#save').addEventListener('click', async () => {
const button = document.querySelector('#save');
button.disabled = true;
try {
const canvas = await html2canvas(document.querySelector('#card'), {
useCORS: true,
backgroundColor: '#ffffff'
});
const preview = new Image();
preview.alt = 'Saved report preview';
preview.src = canvas.toDataURL('image/png');
document.querySelector('#preview').replaceChildren(preview);
canvas.toBlob((blob) => {
if (!blob) throw new Error('PNG encoding failed');
const url = URL.createObjectURL(blob);
const link = document.createElement('a');
link.href = url;
link.download = 'quarterly-report.png';
link.click();
URL.revokeObjectURL(url);
}, 'image/png');
} catch (error) {
console.error(error);
alert('The capture could not be exported. Check CORS and canvas dimensions.');
} finally {
button.disabled = false;
}
});
</script>Pin a version in production according to your dependency policy; the example’s import URL is only a runnable demonstration. The export APIs used here are built into browsers, while html2canvas supplies the canvas.
Performance, reliability, and privacy considerations
- Prefer Blob for large output: it avoids one giant Base64 string and makes memory usage easier to control.
- Capture only what you need: smaller elements finish faster and are less likely to hit canvas limits.
- Wait for stable layout: fonts, images, lazy content, and animations can otherwise produce inconsistent captures.
- Handle errors: html2canvas returns a promise, so use
try…catchand provide a visible failure state. - Protect sensitive data: the resulting data URL contains the captured pixels. Do not log it or place it in analytics events.
- Clean up: revoke Blob URLs and discard temporary canvases when they are no longer needed.
Or skip the browser setup
If you need a service-generated screenshot rather than a browser-side html2canvas reconstruction, ScreenshotNeo accepts one GET request and returns PNG, JPEG, WebP, or PDF. It removes cookie-consent banners, newsletter popups, and chat widgets before capture; bot checks, blank pages, timeouts, failed loads, and cache hits are not billed. Its MCP server provides take_screenshot, get_page_info, and capture_pdf tools for Claude, Cursor, and other MCP clients. The Free plan includes 1,000 screenshots per month without a card; paid plans start at $5 for 3,000 shots.
Use the ScreenshotNeo API documentation for all options. A direct cURL request:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpPython:
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
r.raise_for_status()
open("shot.webp", "wb").write(r.content)Node.js:
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`Screenshot failed: ${res.status}`);
const data = Buffer.from(await res.arrayBuffer());
await import('node:fs/promises').then(fs => fs.writeFile('shot.webp', data));ScreenshotNeo responses include X-Page-Verdict and X-Billed headers so your application can distinguish a clean shot from a failed or non-billable result. Create a free ScreenshotNeo account to get 1,000 screenshots a month with no card.
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Frequently asked questions
Is the html2canvas result already Base64?
No. The promise resolves to an HTMLCanvasElement. Calling toDataURL() produces the data URL containing the Base64-encoded image.
Can I open the data URL in a new tab?
Yes: pass the returned string to window.open(), subject to popup-blocker rules. Displaying it in an <img> is more reliable when the call is asynchronous.
Which export method should I use?
Use toDataURL() for small previews and simple links. Use toBlob() with URL.createObjectURL() for large captures or downloads.
Can html2canvas capture an embedded third-party iframe?
Not when browser security prevents access to that iframe’s document or pixels. Same-origin content or a cooperative integration is required.
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