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Capture an element and upload it
Install the package, select the element you want, then use the following browser-side function. It returns the successful HTTP response so your application can handle whatever response contract its upload endpoint defines.
npm install @html2canvas/html2canvasimport html2canvas from '@html2canvas/html2canvas';
function canvasToBlob(canvas, type = 'image/png', quality) {
return new Promise((resolve, reject) => {
try {
canvas.toBlob(blob => {
if (blob) {
resolve(blob);
} else {
reject(new Error('Canvas conversion failed'));
}
}, type, quality);
} catch (error) {
reject(error);
}
});
}
export async function captureAndUpload(element, endpoint) {
if (!element) throw new Error('Screenshot element was not found');
const canvas = await html2canvas(element, {
scale: window.devicePixelRatio,
useCORS: true
});
const blob = await canvasToBlob(canvas, 'image/png');
const formData = new FormData();
formData.append('screenshot', blob, 'screenshot.png');
const response = await fetch(endpoint, {
method: 'POST',
body: formData
});
if (!response.ok) throw new Error(`Upload failed: ${response.status}`);
return response;
}
const element = document.querySelector('#receipt');
const response = await captureAndUpload(element, '/upload');Use a real endpoint in place of /upload; the browser code cannot determine your server’s route or response format. The multipart field name here is screenshot, and the filename is screenshot.png. Your server must expect that field name or you must change it to match your endpoint.
What each stage does
- DOM element to canvas:
html2canvas(element)returns a Promise that resolves to a canvas rendered from the selected element. - Canvas to Blob:
toBlob()encodes the canvas asynchronously as an image file-like object. PNG is the default if no supported image type is supplied; the example requests PNG explicitly. - Blob to multipart data:
FormDatapackages the Blob as a named upload field. - POST to the server:
fetchsends the form. Checkingresponse.okturns non-success HTTP statuses into an application-visible error.
Why send FormData without a Content-Type header
Do not set Content-Type: multipart/form-data yourself when passing FormData to fetch. The browser must add the multipart boundary parameter that separates the form fields and file data. A manually supplied header generally omits the matching boundary and can leave the server unable to parse the request. Let the browser generate the header.
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The server is responsible for parsing multipart form data and deciding whether to authenticate the request, how large an upload to accept, which file types to permit, and where to store the result. Those policies depend on your application; the browser example does not provide server-side validation or storage.
Choose capture settings for the output you need
High-DPI output
The example sets scale to window.devicePixelRatio, which increases the canvas pixel dimensions for high-density displays. It can improve sharpness, but it also increases memory use and makes the image larger. For predictable, smaller output, choose a fixed scale such as 1 instead of using the device ratio.
Capture a region
Pass the specific DOM element to html2canvas when you need one card, receipt, chart, or other component rather than the whole page. For a manually defined rectangle, the library’s examples use x, y, width, and height options. Ensure the coordinates and dimensions describe the intended area in the rendered page.
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Capture a full page
For a full-page render, set windowWidth and windowHeight to the relevant element’s scroll dimensions, rather than assuming the visible viewport covers all content. Lazy-loaded images may still need to load before capture. Full-page renders can create very large canvases, so watch for browser dimension or area limits; reducing the scale or splitting the capture into smaller regions can avoid blank or partial output.
Choose an image format
toBlob() accepts an image MIME type and, for supported formats, a quality argument. PNG is a practical default when you need broad support or sharp text and interface details. If you request another type, verify that the browser produced the format you expect before naming the upload file with that extension. The filename in FormData does not itself convert the image.
Know what html2canvas can and cannot capture
html2canvas does not take a native screenshot of the browser window. It builds a visual representation from DOM information and CSS. As its documentation explains, the result may not be completely accurate to the real page rendering. CSS features outside its support and browser-rendered details may differ, so check the output against the specific page and styles you need to capture. html2canvas documentation
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This approach runs in a browser context; html2canvas is not a Node.js server-side renderer. If the capture must happen on your server, use browser automation such as Puppeteer or Playwright to render the page in a real browser. If you are building an extension and need the browser’s visible tab rather than a DOM reconstruction, extension APIs such as chrome.tabs.captureVisibleTab() or browser.tabs.captureVisibleTab() are a different option with their own permissions and deployment model. html2canvas FAQ
Fix blank, incomplete, or failed captures
Images are missing or the canvas cannot be exported
A cross-origin image may taint the canvas unless the image server permits cross-origin use. Setting useCORS: true asks the library to load images with CORS, but it does not bypass the browser’s origin security rules: the image server must send a suitable Access-Control-Allow-Origin header. If you control neither the image host nor its CORS configuration, serve the asset through a same-origin proxy that you control, subject to the remote service’s terms.
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A canvas that is not origin-clean can make toBlob() throw a SecurityError. The example rejects if conversion throws and also treats a null Blob as a conversion failure, so callers can handle both cases instead of attempting an upload with no image.
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Content inside a cross-origin iframe is absent
Browser same-origin protections prevent page scripts from reading a cross-origin iframe’s contentDocument. html2canvas cannot reconstruct content it cannot access. Capture content from the iframe’s own origin with code running there, obtain an authorized image from its owner, or use an approach that captures the rendered browser page where appropriate. html2canvas FAQ
The output is blank or cut off
Very large canvas dimensions or total pixel area can exceed browser limits and produce blank or partially rendered output. Reduce the target area, lower scale, or capture separate sections. For long pages, size the render using the content’s scroll dimensions and test the resulting dimensions before encoding.
The upload fails after capture succeeds
Inspect the browser’s Network panel and the HTTP status. Confirm the endpoint accepts POST, parses multipart data, and expects a field named screenshot. Check authentication, file-size limits, allowed media types, and server storage errors. Do not “fix” multipart parsing by setting the Content-Type header manually; let fetch include the boundary.
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The screenshot looks different from the page
That is a capture-fidelity issue, not an upload failure. Since the library reconstructs DOM and CSS rather than copying rendered pixels, first check whether the relevant styles and content are supported and accessible. If exact browser rendering is central to the requirement, consider a real browser capture workflow instead of DOM reconstruction.
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For a URL-based screenshot or PDF, ScreenshotNeo offers a single GET request. Its browser capture service accepts cookie and consent banners like a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each of those steps can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits are not billed, with the page verdict and billing status reported in response headers. ScreenshotNeo also provides an MCP server with take_screenshot, get_page_info, and capture_pdf tools for AI agents and MCP clients. It is a different workflow from capturing an arbitrary live DOM element in the current browser tab.
curl -G "https://api.screenshotneo.com/v1/shot"
-d access_key=YOUR_API_KEY
--data-urlencode url=https://stripe.com
-o shot.webpReplace the example URL with the page you need and provide an API key. See the ScreenshotNeo API documentation for request options and response details. Plans include 1,000 screenshots per month free with no card; paid plans start at $5 for 3,000 screenshots. Learn about ScreenshotNeo or sign up free.
Frequently Asked Questions
Can I capture an HTML element instead of the whole page?
Yes. Select the element and pass it to html2canvas(element); the example above uploads that element’s rendered canvas.
Why is my uploaded screenshot blank even though fetch succeeded?
The capture may have produced a blank canvas before the upload. Oversized dimensions and inaccessible cross-origin content are common causes; check the canvas output and browser console before investigating the endpoint.
Can html2canvas take a screenshot in Node.js?
Not as a server-side renderer: it depends on browser APIs. Use browser automation such as Puppeteer or Playwright when the capture must be performed server-side.
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