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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →An empty html2canvas result usually has a specific cause rather than one universal bug. Check the canvas dimensions first, then investigate cross-origin images and unsupported CSS. A canvas that is larger than the browser allows can be blank or cut off without throwing an error; remote images can be skipped when CORS is not permitted; and html2canvas can omit visual effects it does not implement. The sequence below isolates each cause and gives a working fix.
Start with the canvas dimensions
Let the promise resolve, then inspect the bitmap dimensions before changing options:
const source = document.querySelector('#report');
html2canvas(source).then(canvas => {
console.log({
canvasWidth: canvas.width,
canvasHeight: canvas.height,
cssWidth: canvas.style.width,
cssHeight: canvas.style.height
});
document.body.appendChild(canvas);
});The width and height properties are physical pixels. They include the configured scale, which defaults to window.devicePixelRatio. A long page at a high device-pixel ratio can therefore exceed a browser’s bitmap budget even when its CSS dimensions look reasonable.
Match the rendering window to a full-scroll capture
For an element whose complete scrollable area must be rendered, pass its scroll dimensions as the rendering window and capture dimensions:
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const element = document.querySelector('#report');
const width = element.scrollWidth;
const height = element.scrollHeight;
html2canvas(element, {
windowWidth: width,
windowHeight: height,
width,
height,
x: 0,
y: 0
}).then(canvas => {
document.querySelector('#output').replaceChildren(canvas);
});windowWidth and windowHeight affect the viewport used during rendering, including media-query decisions. width and height set the resulting canvas dimensions. Setting all four deliberately avoids capturing only the currently visible portion when the target is scrollable.
How large is too large?
The html2canvas FAQ describes rough, current guidance rather than guaranteed thresholds. Chrome and Chromium are listed at about 32,767 pixels for one dimension and about 268 million pixels in total area. Firefox is listed at about 32,767 pixels and about 472 million pixels. Desktop Safari is listed at about 32,767 pixels with an area similar to Chrome. iOS limits are lower and depend on device RAM. Browser versions, operating systems and available memory can change the practical result; treat these figures as indications, not contracts.
Compare your measured dimensions with those guides. If the product of width and height is very large, test a smaller region first. Lowering the scale also reduces physical pixels:
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html2canvas(element, {
scale: 1,
windowWidth: element.scrollWidth,
windowHeight: element.scrollHeight
});Splitting a long document into separate sections and composing the images later is another practical diagnostic. A successful small capture confirms that the original failure is related to size or memory, although neither lower scale nor splitting is a guarantee for every device.
Check cross-origin images
With allowTaint: false (the default), html2canvas skips an image when drawing it would taint the canvas. useCORS: true asks the browser to load the image with CORS, but it works only when the image server returns a suitable Access-Control-Allow-Origin header. The option cannot override a server’s policy.
Test with CORS enabled
html2canvas(document.querySelector('#report'), {
useCORS: true,
onclone: clonedDocument => {
// Optional: adjust only the cloned DOM used for rendering.
},
onError: error => {
console.error('html2canvas resource error', error);
}
}).then(canvas => {
const link = document.createElement('a');
link.download = 'report.png';
link.href = canvas.toDataURL('image/png');
link.click();
});Inspect the image request in browser developer tools and verify its response headers. To isolate the problem, temporarily remove remote images or replace them with same-origin files. If the canvas becomes correct, configure the image host to allow the requesting origin, or use a proxy that fetches the image and serves it from an origin your page can access.
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Why allowTaint: true is not an export fix
Allowing a tainted image may let the image be drawn, but a tainted canvas cannot safely be read with toDataURL(), toBlob() or pixel APIs. Do not use that setting as a way to produce downloadable output. CORS headers or a properly configured proxy are the relevant remedies.
Separate rendering limitations from capture failures
html2canvas is a DOM renderer, not a browser screenshot command. It walks the document and recreates a representation from properties it knows how to render. A feature that is visible in the browser can therefore be missing or look different in the result. The project documentation states: “Every CSS property must be manually implemented to render correctly, so html2canvas will never have full CSS support.”
Reduce the reproduction
- Capture the smallest subtree that still shows the defect.
- Temporarily remove filters, complex gradients, masks, unusual blend modes and other advanced effects.
- Replace web fonts and remote backgrounds with simple, same-origin assets.
- Compare the output with the library’s supported-feature documentation rather than expecting pixel equivalence.
If a simplified subtree renders but the full design does not, the issue is feature coverage or a resource dependency, not an empty-canvas API error. For a browser-faithful image, use a headless browser screenshot workflow instead of treating html2canvas as a pixel capture API.
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A cause-based diagnostic procedure
- Confirm the promise and inspect dimensions. Log
canvas.widthandcanvas.heightimmediately after resolution. A zero or unexpectedly small value points to your size settings or element geometry. - Measure the source. Record
scrollWidth,scrollHeight,getBoundingClientRect()and the active device-pixel ratio. Multiply the intended CSS size by the scale to estimate physical pixels. - Try a small region at scale 1. If it works, restore dimensions gradually. This identifies a browser or memory limit without assuming a single fixed maximum.
- Set the scroll viewport explicitly. For a full element, pass
windowWidthandwindowHeightfrom its scroll dimensions. Usewidthandheightwhen you also need deterministic output dimensions. - Remove external images. If output changes, inspect CORS response headers, then use
useCORS: trueor a proxy that you control. - Watch resource errors. Supply the documented
onErrorcallback and inspect the browser console and network panel. - Simplify CSS and DOM. Test one component at a time and check whether the missing visual relies on an unsupported property.
- Choose the correct architecture. html2canvas requires
window,documentand computed styles, so it runs in a browser page, not directly in Node.js. For server-side work, drive a headless browser such as Puppeteer or Playwright.
Common symptoms and targeted fixes
| Symptom | Likely cause | What to try | Limitation |
|---|---|---|---|
| Entire canvas is blank with no exception | Bitmap exceeds a browser or platform limit | Inspect dimensions, match scroll window settings, lower scale, or capture smaller regions | Limits vary by browser, platform and memory |
| Only the top or part of a long element appears | Viewport or canvas dimensions do not include the scroll area | Set windowWidth/windowHeight to scrollWidth/scrollHeight and set output dimensions explicitly |
A huge resulting bitmap can still fail |
| Text and layout appear but photos are missing | Cross-origin images were skipped | Use useCORS: true after enabling CORS on the image server, or use a proxy |
The remote server must send an appropriate header |
| Export throws a security error | The canvas is tainted by an image | Remove the image, fix CORS, or proxy it; do not rely on allowTaint: true |
Tainted canvases cannot be read or exported |
| A visible effect is absent or different | Unsupported or incomplete CSS rendering | Simplify the style or use a real browser screenshot | html2canvas does not promise full CSS fidelity |
| Code fails during server rendering | No browser globals | Run it in a browser, or use Puppeteer/Playwright for server-side capture | html2canvas itself is client-side |
Options that matter when debugging
scale: Defaults towindow.devicePixelRatio. Lower it to reduce physical dimensions while diagnosing size failures.widthandheight: Control the output canvas size; use them intentionally for a known crop or full capture.windowWidthandwindowHeight: Control the virtual rendering window and media queries. They are especially important for scrollable content.useCORS: Enables CORS-mode image requests but does not create permission on the image server.allowTaint: Permits drawing potentially tainting resources, which prevents safe export; it is not a general solution.onError: Surfaces resource-loading failures so they do not remain invisible in a successful promise.
When a browser screenshot service is a better fit
If you need server-side captures, full CSS behavior, or repeatable results without shipping a browser-rendering page to every client, use a browser-driven screenshot architecture. ScreenshotNeo is a website screenshot API and MCP server for developers. It accepts a URL and returns PNG, JPEG, WebP or PDF; before capture it accepts consent banners and removes more than 60 known consent platforms, newsletter popups and chat widgets. It bills only clean shots: bot checks or CAPTCHAs, blank pages, timeouts, failed loads and cache hits are not billed, and response headers identify the page verdict and billing result.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Or skip the browser setup
Make one GET request instead of maintaining html2canvas code in a page. The examples use https://stripe.com; replace it with your target URL. See the ScreenshotNeo documentation for request options.
cURL
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)
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}`);ScreenshotNeo also supports full-page captures with lazy images loaded, CSS-selector element capture, dark mode, 12 device presets and custom viewports, retina scale, PDF paper and page controls, custom CSS and JavaScript, pre-capture clicks, hidden selectors, selector/delay/network-idle waits, blocking ads or resource types, custom headers, cookies, user agents and Authorization, timezone and geolocation, transparent backgrounds, resizing, configurable-TTL caching, signed image links, asynchronous jobs with signed webhooks, bulk capture of up to 100 URLs per call, a usage API and an OpenAPI specification. Parameter names used by other screenshot APIs also work, which can simplify migration.
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|---|---|---|
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Yearly billing gives two months free, and every feature is included on every plan. Cookie banners, popups and chat widgets are removed before the shot; bot checks, blank pages and failed loads are never billed; and the MCP server lets AI agents such as Claude or Cursor take screenshots. Start with 1,000 free screenshots a month—no card required.
Performance and reliability considerations
- Measure before tuning: physical canvas pixels, not CSS pixels, determine memory pressure.
- Capture only the region you need, and use a lower scale when publication resolution permits.
- Keep remote assets same-origin or configure CORS deliberately; a single blocked image can change the result.
- Use explicit waits for content that appears after JavaScript, and verify that lazy-loaded images are present before capture.
- For recurring server jobs, record HTTP status, response headers and the resulting dimensions so failures can be distinguished from valid blank pages.
Frequently Asked Questions
Can html2canvas capture a page from Node.js?
No. It depends on browser APIs such as window, document and computed styles. Run it in a browser, or use a headless browser solution such as Puppeteer or Playwright for server-side screenshots.
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Will useCORS:true allow any external image?
No. The image server must return a suitable Access-Control-Allow-Origin header. If it does not, use a proxy or remove the image.
Why does lowering scale sometimes help?
Scale multiplies CSS dimensions into physical bitmap pixels. A lower value can keep the canvas under a browser’s dimension or area limit, but it is a diagnostic and quality trade-off rather than a universal fix.
Recommended Free Tools
Does html2canvas reproduce every CSS effect?
No. It reconstructs the DOM using implemented properties, so unsupported or incomplete CSS can be absent or visually different.
Quick Recap
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