You can use one button to capture several elements in the current document with html2canvas: select the elements, call html2canvas(element) for each, and export each returned canvas. This does not automatically capture several URLs. If you mean separate web pages, you need a browser automation or screenshot service that can navigate to each URL.
What “multiple pages” means with html2canvas
html2canvas works from a page’s DOM. It reads accessible document elements and styles, then reconstructs them on a canvas; it does not take a native screenshot of browser pixels or navigate between URLs for you. Its documentation cautions that the result may not exactly match the browser rendering: html2canvas documentation.
Several sections or elements in one document
If your page contains several report panels, cards, or sections that should become separate image files, you can capture each element in turn from a single click. All targets must be present in, and accessible to, the current document.
Several distinct URLs
A client-side call cannot use html2canvas to visit arbitrary URLs. A same-origin application can load content it is permitted to access and capture its own DOM, subject to browser security rules. For automated capture across URLs, use a browser automation tool such as Puppeteer or Playwright, or a screenshot API that loads the URL on your behalf.
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Capture several elements with one button
Include the html2canvas library in your page using the installation method appropriate to your project. The following example assumes the library is loaded and that the target elements already exist when the script runs. Each element with class capture-page is exported as its own PNG.
const button = document.querySelector("#capture-all");
const targets = [...document.querySelectorAll(".capture-page")];
button.addEventListener("click", async () => {
if (targets.length === 0) {
console.warn("No elements matched .capture-page");
return;
}
button.disabled = true;
try {
for (const [index, target] of targets.entries()) {
try {
const canvas = await html2canvas(target);
const link = document.createElement("a");
link.download = `capture-${index + 1}.png`;
link.href = canvas.toDataURL("image/png");
link.click();
} catch (error) {
console.error(`Capture ${index + 1} failed`, error);
}
}
} finally {
button.disabled = false;
}
});Example markup:
<button id="capture-all" type="button">Capture all sections</button>
<section class="capture-page">First report section</section>
<section class="capture-page">Second report section</section>The loop is an implementation pattern using the library’s Promise-based API, not a built-in multi-page command. It awaits each capture before beginning the next, which keeps the workflow straightforward. The per-element try/catch allows later captures to continue if one target fails. Remove the inner error handler if a failure should stop the sequence instead.
Download behavior and user interaction
Browsers may limit multiple downloads initiated from one click, especially where the site has not been granted permission for repeated downloads. Test the flow in the browsers your users rely on. If the browser blocks some files, offer a ZIP assembled from the generated images or show a separate download link per image, rather than assuming every automatic download will be accepted.
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For an interface with dynamic content, query the targets inside the click handler so the list reflects the latest DOM, and ensure the target elements are fully rendered before calling html2canvas. If one capture takes long enough for a user to click again, disabling the button during the operation prevents duplicate runs.
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Capture a long section and control rendering
html2canvas normally renders using the current window dimensions and a scale based on the device pixel ratio. Its configuration options let you adjust the rendering viewport and scale. For a long element, the project FAQ recommends setting windowWidth and windowHeight to the element’s scrollWidth and scrollHeight; this gives the renderer dimensions matching the content, but it does not lift browser canvas limits.
const canvas = await html2canvas(target, {
windowWidth: target.scrollWidth,
windowHeight: target.scrollHeight,
scale: 1
});Use a lower scale if a high-resolution capture produces too many pixels or consumes too much memory. Smaller scale reduces detail as well as output size, so inspect the saved image at its intended display size.
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Options that help with real pages
scalecontrols output resolution; its default is the device pixel ratio.scrollXandscrollYset the scroll position used for rendering.onclonelets you make changes to the cloned document before rendering, such as hiding transient content without changing the live page.cullOffscreencan skip wholly offscreen elements when capturing a viewport-sized region.- Add
data-html2canvas-ignoreto controls or other nodes that should not appear in the rendered output.
See the configuration reference for the supported options. Use only settings you need: viewport dimensions, scale, scroll position, and clone-time adjustments affect what appears in the image.
Cross-origin images, iframes, and CSS fidelity
Images hosted on another origin
Browsers protect canvas content from cross-origin data that has not been permitted for use. With the default allowTaint: false, images that would taint the canvas are skipped. Setting useCORS: true may let html2canvas load an image from another origin only when that host supplies appropriate CORS headers; it cannot override the host’s policy. If you control the image host, configure CORS there. Otherwise, a properly configured proxy may be needed. The html2canvas FAQ describes these restrictions.
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A cross-origin iframe’s document is inaccessible to the parent page under browser security rules, so html2canvas cannot render its contents. Same-origin iframes can be supported recursively. If the content is third-party, use an authorized capture method that can access the page, rather than trying to bypass the browser boundary.
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Visual differences
Because the library reconstructs the view from DOM and CSS rather than copying rendered pixels, some browser features or CSS may not render as expected. Compare the result in the browser and stylesheet combination you actually support. Do not promise pixel-perfect screenshots, and account for fonts, images, dynamic components, and effects that may render differently from the live page.
Canvas size, memory, and reliability
Very large canvases can be blank or partially rendered, sometimes without a useful exception. Maximum dimensions vary by browser, operating system, and hardware, so there is no single safe canvas size to promise. Capturing a long document as multiple smaller sections and lowering scale when necessary are practical mitigations. Validate output on the devices and browsers your users run.
Capturing one element at a time is usually easier to recover from than starting many large render jobs simultaneously. Concurrent captures may use substantial memory; there is no universal safe concurrency level. If you choose concurrency for speed, measure memory and failure behavior on representative pages.
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In a long-lived single-page application, the configuration reference documents clearImageCache as a way to clear the shared image cache after rendering and release loaded-image memory. Do not enable it while concurrent captures depend on the shared cache.
When to use a different capture method
| Need | Better fit | Important distinction |
|---|---|---|
| Capture several accessible DOM elements in a page | html2canvas | Convenient in-page workflow, but it reconstructs from DOM and CSS. |
| Capture the visible tab in a browser extension | Native extension screenshot API | The html2canvas FAQ names chrome.tabs.captureVisibleTab() for Chrome, Edge, and Opera, and browser.tabs.captureVisibleTab() for Firefox. Extension permissions and API rules apply. |
| Generate screenshots on a server or visit distinct URLs | Puppeteer or Playwright, or a screenshot API | These approaches drive a browser rather than relying on the page’s client-side DOM and browser canvas. |
html2canvas depends on browser APIs such as window, document, and computed styles, so it is not a server-side rendering solution by itself. For extension capture, a native tab screenshot API is more appropriate and avoids html2canvas canvas-size limits; it captures the visible tab rather than arbitrary DOM elements.
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Troubleshooting common failures
No files download
- Check the browser’s multiple-download permission or prompt. Some browsers do not allow a page to trigger many downloads from one user gesture.
- Confirm the click handler ran and that the selector found one or more targets.
- Inspect the console for exceptions during rendering or
toDataURL().
An image is missing or export fails
- For cross-origin images, verify that the image server returns CORS headers suitable for the page;
useCORS: truealone does not grant permission. - Check whether a cross-origin iframe is part of the target. Its contents cannot be accessed by html2canvas.
- Reduce the captured area or scale if the canvas is too large and blank, incomplete, or unable to export.
The output differs from the visible page
- Check whether the relevant CSS and browser features are supported by html2canvas.
- Wait for fonts, images, and dynamic content before capture.
- Use
oncloneto adjust the cloned DOM and inspect the image in the target browser, rather than changing the live page only for the capture.
Frequently asked questions
Can html2canvas save all captured sections as one image?
The pattern above creates one canvas and image per target. To create one combined image, you would need to compose the canvases onto another canvas yourself, accounting for their dimensions and layout; that combined canvas is subject to the same browser size and memory constraints.
Does one-button capture require a server?
No, not when all targets are accessible in the current page and client-side output is suitable. Use server-side browser automation when the job needs to navigate URLs independently or run outside a visitor’s browser.
Can html2canvas capture a full page?
It can render a tall element when given appropriate rendering dimensions, but browser canvas limits still apply. For lengthy content, splitting it into smaller targets is often more reliable than producing one enormous canvas.
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