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Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →If html2canvas cuts off the bottom of a tall element, set its virtual rendering window to the element’s scroll dimensions—not the browser viewport. For a full document, use the document’s scroll dimensions. Then check cropping, scroll position, canvas limits, cross-origin images, and CSS or iframe constraints if the output is still incomplete.
Set the rendering window to the content size
html2canvas renders a page from the DOM; it does not take a native browser screenshot. Its default rendering window can be smaller than a tall element, so content beyond that window may be omitted or the result may be cut off. The project FAQ’s direct fix is to set windowWidth and windowHeight to the element’s scroll dimensions. See the html2canvas FAQ.
const element = document.querySelector('#capture');
if (!element) throw new Error('Capture element not found');
const canvas = await html2canvas(element, {
windowWidth: element.scrollWidth,
windowHeight: element.scrollHeight,
});
This assumes html2canvas is already loaded and the call runs in an async function or module. scrollWidth and scrollHeight describe the full scrollable content, unlike clientWidth and clientHeight, which describe the visible interior. The windowWidth and windowHeight options control the virtual window used to render; they are not just output crop dimensions.
Capture a whole document
For a document rather than a single element, use the document’s scroll dimensions. A common choice is document.documentElement; depending on the page, document.body may be the relevant scrolling element. Check the measured values in the page you are capturing rather than assuming the viewport represents the whole document.
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const target = document.documentElement;
const canvas = await html2canvas(target, {
windowWidth: target.scrollWidth,
windowHeight: target.scrollHeight,
});
If the page uses an unusual scrolling structure, inspect document.scrollingElement and the element being passed to html2canvas. The capture target and the dimensions used for the rendering window should correspond to the content you want.
Choose the output crop and scroll position
Correcting the virtual window does not always mean you want every pixel of the target. html2canvas supports x, y, width, and height to control the captured area. Use these when you intentionally need a crop, or when you need to make the output bounds explicit. The configuration reference documents these options.
const canvas = await html2canvas(element, {
windowWidth: element.scrollWidth,
windowHeight: element.scrollHeight,
x: 0,
y: 0,
width: element.scrollWidth,
height: element.scrollHeight,
});
For a capture taken after scrolling, scrollX and scrollY determine the scroll position used for rendering. A fixed header, sticky navigation, or nested scrolling container can therefore affect what appears and where. If a nested scroller is clipped, a practical workaround may be to temporarily expand the target or remove its inner scrolling constraint before capture, then restore its original styles.
Keep the live page unchanged
When a temporary layout change is needed, save the original inline styles, apply the capture-only values, wait for the layout to settle, capture, and restore the styles in a finally block. Alternatively, use the onclone callback to adjust the cloned document used for rendering. This avoids changing the visible live document, though cloned layout changes still need to be deliberate.
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Use a diagnostic capture before changing more settings
This example makes the output bounds explicit, caps scale at 2 to avoid needlessly multiplying pixels on high-density displays, enables CORS image loading, and removes nodes marked to be ignored from the cloned document. Use useCORS only if the image host sends suitable CORS headers; it does not bypass browser security.
async function captureWholeElement(element) {
if (!element) throw new Error('Pass an element to capture');
const width = element.scrollWidth;
const height = element.scrollHeight;
if (!width || !height) throw new Error('Capture element has no measurable size');
return html2canvas(element, {
windowWidth: width,
windowHeight: height,
width,
height,
scale: Math.min(window.devicePixelRatio || 1, 2),
useCORS: true,
onclone: (clonedDocument) => {
clonedDocument
.querySelectorAll('[data-html2canvas-ignore]')
.forEach((node) => node.remove());
},
});
}
const canvas = await captureWholeElement(document.querySelector('#capture'));
Add data-html2canvas-ignore to controls, overlays, or other elements that should not appear in the image. html2canvas recognizes this attribute. The onclone callback edits the cloned document used for rendering, not the live page.
Check canvas dimensions and scale
A canvas can be blank or partial even when the dimensions appear correct: browsers impose maximum canvas dimensions and total pixel-area limits, and may fail silently. The html2canvas FAQ gives rough current guidance of about 32,767 pixels per dimension for Chrome/Chromium, Firefox, and desktop Safari, with lower limits on iOS Safari; these are approximate browser guidance, not guaranteed specifications. Total pixel-area limits vary too. See the FAQ’s canvas-size notes.
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Output pixel dimensions grow with the scale option. By default, scale follows window.devicePixelRatio; a tall capture rendered at high scale can exceed a limit sooner than its CSS dimensions suggest. The configuration reference documents scale.
Recommended Free Tools
- Log the target’s scroll dimensions and the resulting canvas’s
widthandheight. - Lower
scaleif the canvas is excessively large. This reduces output resolution as well as memory pressure. - If a complete image still exceeds browser limits, capture smaller vertical sections and stitch them, taking care to avoid gaps or duplicated sticky content.
- For reliable server-side screenshots of long pages, consider browser automation rather than a single oversized canvas.
Resolve missing images, CSS differences, and iframes
Cross-origin images
With the default allowTaint: false, html2canvas checks images that could taint the canvas and skips ones it cannot safely use. Setting useCORS: true asks the browser to load images through CORS, but the image server must send an appropriate Access-Control-Allow-Origin header. If it does not, configure the image host or load the asset through a same-origin proxy you control. These restrictions are browser security behavior, not a crop setting. See the html2canvas FAQ and configuration reference.
Unsupported or partially supported CSS
html2canvas reconstructs the image from DOM and CSS rather than asking the browser for a native screenshot. Its documentation explains that CSS properties must be manually implemented, so support is not complete. A complete canvas can therefore still look different from the page. Check the project’s features list for the properties relevant to your layout. If fidelity depends on CSS html2canvas does not implement, changing the capture dimensions will not fix it.
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Cross-origin iframes
A page inside a cross-origin iframe cannot be read through the parent page’s DOM: browser same-origin security prevents access to its contentDocument. html2canvas documents that cross-origin iframes cannot be rendered. Capture the content from its own origin, if you control it, or use a screenshot workflow that can access the rendered browser surface. See the html2canvas documentation.
Troubleshoot by symptom
| Symptom | Likely cause | What to try |
|---|---|---|
| Only the visible portion appears | Rendering window follows viewport-sized dimensions | Set windowWidth and windowHeight to the target’s scroll dimensions. |
| Bottom is cut off or canvas is blank | Canvas dimension or total pixel-area limit | Lower scale, capture sections, and inspect the actual canvas dimensions. |
| Images are absent | Cross-origin image lacks suitable CORS headers | Use useCORS: true only when supported by the host, or use a same-origin proxy. |
| Sticky header or nested area looks wrong | Scroll position, fixed positioning, or inner overflow affects rendering | Set scrollX/scrollY as needed; temporarily expand the inner scroller or hide the obstruction in the clone. |
| Image differs despite complete dimensions | CSS feature is unsupported or only partly implemented | Check the html2canvas features list; use a browser screenshot method if exact browser rendering is necessary. |
| Embedded content is missing | Cross-origin iframe cannot be inspected by the page | Capture it from its own origin or use a browser-level screenshot workflow. |
When to switch from html2canvas
For an in-browser DOM rendering where an approximate reconstruction is acceptable, html2canvas can be useful. For a screenshot that must match the browser’s actual rendering, very tall pages, or content constrained by iframe and CSS limitations, the html2canvas FAQ points to native extension screenshot APIs for browser extensions and Puppeteer or Playwright for server-side screenshots. Those approaches have different setup and operational requirements; choose based on rendering fidelity, page height, access to cross-origin content, output format, and where the capture must run.
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Or skip the browser setup
If you need a screenshot of a live website rather than a canvas generated from an already loaded DOM, ScreenshotNeo provides a website screenshot API and MCP server. One GET request returns a PNG, JPEG, WebP, or PDF. Its capture steps can accept cookie or consent banners and remove more than 60 known consent platforms, newsletter popups, and chat widgets; each step can be turned off. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers report the page verdict and billing status. An MCP server exposes take_screenshot, get_page_info, and capture_pdf to Claude, Cursor, and other MCP clients.
Install your preferred HTTP client and replace the URL with the page you want to capture. See the ScreenshotNeo API documentation for request options and response details.
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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpimport 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)const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);The Free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000 shots. These are website captures through an API, not a fix for html2canvas’s rendering of a DOM element in your own page. Sign up for 1,000 free screenshots a month with no card.
FAQ
Does html2canvas take a native screenshot of the browser?
No. It builds a canvas by interpreting the page’s DOM and supported CSS, so its result can differ from the browser’s native rendering.
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Can I use html2canvas to capture a cross-origin iframe?
No. Browser same-origin restrictions prevent the parent page from reading a cross-origin iframe’s document.
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