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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteTo capture content hidden inside a fixed-height, scrollable <div>, pass that element’s scrollWidth and scrollHeight as html2canvas’s windowWidth and windowHeight. Then send the resulting canvas to a PDF library such as html2pdf.js. This renders the element’s full DOM extent instead of only the portion currently visible in the browser.
The method is not a native browser screenshot. html2canvas reconstructs an image from DOM and computed-style information, so validate the PDF for clipping, unsupported CSS, remote images, cross-origin frames, and browser canvas limits.
Capture the complete scrollable element
Give the scrollable element an identifier, load html2canvas, and use its measured content dimensions:
<div id="content-to-export" class="scroll-box">
<!-- Long content, including material below the current scroll position -->
</div>
<script src="https://cdn.jsdelivr.net/npm/html2canvas@latest/dist/html2canvas.min.js"></script>
<script>
async function captureScrollableDiv() {
const element = document.querySelector('#content-to-export');
if (!element) throw new Error('Scrollable element was not found');
const canvas = await html2canvas(element, {
windowWidth: element.scrollWidth,
windowHeight: element.scrollHeight,
useCORS: true
});
return canvas;
}
</script>scrollWidth and scrollHeight describe the element’s complete content extent, including the portion hidden by overflow: auto or overflow: scroll. The returned canvas can be displayed, downloaded, or passed to a PDF generator.
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Download a PNG while testing
const canvas = await captureScrollableDiv();
const link = document.createElement('a');
link.download = 'scrollable-content.png';
link.href = canvas.toDataURL('image/png');
link.click();Inspect this image before adding PDF conversion. If the PNG is already clipped or blank, changing PDF settings will not repair the capture.
Convert the canvas to a PDF
html2pdf.js is a browser-side option that combines html2canvas with jsPDF. Its page-break and page-size controls are useful when a tall canvas must become a multi-page document.
<script src="https://cdn.jsdelivr.net/npm/html2pdf.js@latest/dist/html2pdf.bundle.min.js"></script>
<script>
async function exportScrollableDivAsPdf() {
const element = document.querySelector('#content-to-export');
if (!element) throw new Error('Scrollable element was not found');
const canvas = await html2canvas(element, {
windowWidth: element.scrollWidth,
windowHeight: element.scrollHeight,
useCORS: true
});
await html2pdf()
.set({
margin: 10,
filename: 'scrollable-content.pdf',
image: { type: 'jpeg', quality: 0.95 },
html2canvas: { scale: 1 },
jsPDF: { unit: 'mm', format: 'a4', orientation: 'portrait' },
pagebreak: { mode: ['css', 'legacy'] }
})
.from(canvas)
.save();
}
</script>Some html2pdf.js versions accept an element directly through .from(element), but passing the already-rendered canvas makes it explicit that the scroll-dimension capture is being used. Test page breaks with your installed version; a single very tall image can still be scaled or split in an undesirable way.
Understand the two sets of dimensions
The most common configuration mistake is confusing html2canvas’s window dimensions with its canvas dimensions.
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| Option | Meaning | Value for a scrollable div |
|---|---|---|
windowWidth |
The virtual browser-window width used while rendering. It can change responsive media-query results. | element.scrollWidth |
windowHeight |
The virtual browser-window height used while rendering. | element.scrollHeight |
width |
The canvas width, when you explicitly override it. | Usually leave unset unless you have a measured layout requirement. |
height |
The canvas height, when you explicitly override it. | Usually leave unset; forcing a height can create clipping or excess blank space. |
Setting the window dimensions does not automatically remove every CSS constraint in the cloned document. If the clone still has a fixed height, hidden overflow, or a component that only renders rows currently in view, inspect the cloned layout and adjust the page-specific styles before capture.
Prepare the page before rendering
Wait for asynchronous content
Capture only after your application has inserted all rows, expanded lazy sections, and finished loading images. There is no universal delay that works for every site. Prefer an application state signal, such as a promise that resolves after data and images are ready.
async function waitForImages(root) {
const images = [...root.querySelectorAll('img')];
await Promise.all(images.map(img => {
if (img.complete) return Promise.resolve();
return new Promise(resolve => {
img.addEventListener('load', resolve, { once: true });
img.addEventListener('error', resolve, { once: true });
});
}));
}
const element = document.querySelector('#content-to-export');
await waitForImages(element);
const canvas = await html2canvas(element, {
windowWidth: element.scrollWidth,
windowHeight: element.scrollHeight,
useCORS: true
});For virtualized lists, scrolling the container may be necessary to make the application render additional rows, or you may need an export-specific view that renders the complete dataset. html2canvas cannot capture DOM nodes that your application never created.
Preserve a stable layout
- Freeze animations and transitions during export so elements do not move between layout and paint.
- Use a dedicated print/export class to remove sticky toolbars, hover menus, and controls that should not appear in the PDF.
- Measure dimensions after fonts and images have loaded; late font substitution can change line wrapping and height.
- Keep the element’s background, padding, and color styles explicit rather than relying on browser defaults.
What html2canvas can and cannot reproduce
The project documentation describes the result as a DOM-based reconstruction rather than a guaranteed pixel-identical browser screenshot. CSS properties that html2canvas does not implement, complex filters, unusual blend modes, and browser-native controls may differ from what you see on screen. Check the supported-features documentation for the version you ship and compare output in the browsers your users actually run.
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Remote images
Same-origin images are the straightforward case. For a cross-origin image, useCORS: true asks the browser to load it with CORS, but the image server must send an appropriate Access-Control-Allow-Origin response. This option cannot bypass browser security. If the remote server does not permit your origin, host the asset on an allowed origin or use a server-side proxy that you control.
Frames
Same-origin iframe contents can be traversed recursively according to the project documentation. Cross-origin frames cannot be read by page JavaScript, so their contents will not be available to html2canvas.
Searchable text and accessibility
A canvas-to-PDF pipeline is fundamentally image-oriented. Text may be rasterized rather than selectable, searchable, or exposed as semantic document structure. For invoices, reports, accessibility workflows, or machine processing, generate a semantic HTML/print document or a PDF directly from structured data instead of relying on a canvas image.
Canvas limits and very tall content
Browser limits vary by engine, platform, graphics hardware, and updates. The html2canvas FAQ gives rough current guides of approximately 32,767 pixels for one canvas dimension in evergreen Chrome/Chromium, Firefox, and desktop Safari; approximately 268 million pixels of total canvas area for Chrome/Chromium; and approximately 472 million pixels for Firefox. These are not guarantees.
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A scrollable element that is 20,000 pixels high and 2,000 pixels wide already requires about 40 million pixels before any device-pixel scaling. A larger scale multiplies memory and pixel count. If the output is blank, truncated, or the tab becomes unresponsive, log the measured dimensions and reduce the capture size.
Split oversized content into sections
When one canvas is impractical, capture logical sections separately and add each image to successive PDF pages. This is an engineering workaround rather than a universal html2canvas algorithm:
const sections = [...document.querySelectorAll('.export-section')];
const pdfImages = [];
for (const section of sections) {
const canvas = await html2canvas(section, {
windowWidth: section.scrollWidth,
windowHeight: section.scrollHeight,
useCORS: true,
scale: 1
});
pdfImages.push(canvas.toDataURL('image/png'));
}
// Add each data URL to your PDF library on its own page,
// choosing page dimensions and margins for your document.Choose boundaries that do not cut through tables or cards, and inspect the final multi-page PDF for repeated headers, margins, and readable text.
Troubleshooting checklist
| Symptom | Likely cause | Fix |
|---|---|---|
| Only the visible portion is captured | The renderer used the viewport dimensions or the element was measured before expansion. | Pass scrollWidth and scrollHeight as windowWidth and windowHeight after content is fully rendered. |
| Canvas is blank or stops halfway | The requested canvas exceeds a browser or platform limit. | Record width, height, and area; lower scale, reduce the export width, or capture sections separately. |
| Images are missing | Cross-origin responses do not grant access, or images were not loaded yet. | Wait for images, use useCORS: true, verify response CORS headers, or proxy the assets. |
| Styles differ from the page | html2canvas does not implement every CSS feature, or responsive rules changed under the virtual window. | Check supported features, set deliberate window dimensions, and add export-specific CSS. |
| An iframe is empty | The iframe is cross-origin. | Use a same-origin frame, export its data separately, or obtain the content through an authorized server-side process. |
| Rows are missing from a long list | The list is virtualized and off-screen rows are not present in the DOM. | Render all rows in an export view or use an application-level data export. |
| PDF text cannot be selected | The canvas was embedded as an image. | Generate a semantic or print-oriented PDF when selectable text and accessibility are requirements. |
| PDF pages have awkward breaks | A single tall image is being scaled or split by the PDF library. | Use page-break and page-size controls, or capture smaller sections and place them deliberately. |
Performance and reliability practices
- Capture at the smallest CSS width that preserves the required layout; unnecessary width increases pixel count.
- Use a moderate scale for ordinary documents. Retina-scale output can improve sharpness but rapidly increases memory use.
- Release large canvases after saving, and avoid retaining multiple full-size data URLs in memory.
- Run export from a user action and show progress for long documents; a browser tab can be killed if memory pressure becomes high.
- Test Chrome/Chromium, Firefox, and Safari separately when the document is business-critical because limits and CSS rendering differ.
- Open the produced PDF and check the beginning, middle, and end, not just whether a download occurred.
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When to choose each approach
| Requirement | html2canvas in your page | ScreenshotNeo or another service |
|---|---|---|
| Capture a private, authenticated DOM already open in the user’s browser | Good fit; no server access is needed. | Requires a way to authenticate the requested URL, such as supported headers or cookies. |
| Exact control over application state and export-only styles | Best fit because your code controls the DOM. | Use service-side CSS/JavaScript options when the page is publicly reachable. |
| Searchable, semantic PDF | Not a natural fit when the output is a canvas image. | Use a document-generation workflow designed for text and accessibility. |
| Repeatable capture without shipping browser code | Requires maintaining client-side integration and handling browser limits. | An API or MCP server can centralize capture and report billing/page verdicts. |
FAQ
Frequently Asked Questions
Can html2canvas capture content inside a nested scrollable div?
Yes, if the nested content exists in the DOM. Select the specific container and pass that container’s own scrollWidth and scrollHeight. If a child list is virtualized, off-screen rows must first be rendered.
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Usually no. The scroll-dimension fix uses windowWidth and windowHeight. Explicit width or height values are separate canvas controls and can introduce clipping or blank space unless you have a measured reason to override them.
Does useCORS download images from any domain?
No. It works only when the image server permits your origin with suitable CORS headers. Browser same-origin policy still applies.
Why is my PDF huge?
A tall raster canvas contains many pixels, and PNG or high-quality JPEG data can consume substantial memory. Lower the capture scale, split sections, or generate a text-oriented PDF when image fidelity is not essential.
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