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Vertical cropping after an onclone change usually means the cloned document is still being rendered inside a short window or a constrained scroll box. Measure the target, set windowWidth and windowHeight to the intended scroll dimensions, remove clone-only height and overflow limits, and set the correct scrollY. Then check nested scrollers, responsive breakpoints, rendering mode, and browser canvas limits.
Why an onclone edit can make the bottom disappear
onclone receives the temporary document that html2canvas renders; it does not edit the live page. html2canvas establishes the rendering window from windowWidth, windowHeight, scrollX, and scrollY, then loads the clone inside those bounds. A clone that gains a short height, max-height, overflow:hidden, a hidden wrapper, or a different responsive layout can therefore produce a canvas that ends at a wrapper or viewport boundary.
The same visual symptom has several causes. A target may genuinely have little content, the target may be a nested scrolling element, the page may be captured from a stale scroll origin, or the output may exceed the browser’s canvas area limit. Fix the layout and coordinate system before changing scale or stitching images.
Measure the target before changing the capture
Run this in the same page state in which you call html2canvas. The values distinguish a short layout from a crop introduced during cloning:
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const target = document.querySelector('#capture');
if (!target) {
throw new Error('The #capture element was not found');
}
const rect = target.getBoundingClientRect();
console.table({
scrollWidth: target.scrollWidth,
scrollHeight: target.scrollHeight,
clientWidth: target.clientWidth,
clientHeight: target.clientHeight,
rectWidth: rect.width,
rectHeight: rect.height,
pageScrollX: window.scrollX,
pageScrollY: window.scrollY
});scrollHeightversusclientHeight: a larger scroll height proves that content extends beyond the visible box.scrollWidth: use it when a horizontal scrollbar or responsive breakpoint affects the layout.getBoundingClientRect(): shows the target’s current viewport position and visible size.- Page offsets: a nonzero
window.scrollYmatters when the capture is intended to start at the top.
If scrollHeight is already close to clientHeight, the missing content is probably hidden by application logic rather than cropped by the canvas. If the crop ends exactly at a viewport or wrapper edge, continue with the clone-window repair.
Set the clone window to the content dimensions
For a tall element whose complete contents should be rendered, start with the element’s scroll dimensions and make the capture top-anchored. The clone-only style changes leave the live interface untouched:
const target = document.querySelector('#capture');
const canvas = await html2canvas(target, {
windowWidth: target.scrollWidth,
windowHeight: target.scrollHeight,
scrollX: 0,
scrollY: 0,
onclone: (doc) => {
const cloneTarget = doc.querySelector('#capture');
cloneTarget.style.height = `${cloneTarget.scrollHeight}px`;
cloneTarget.style.maxHeight = 'none';
cloneTarget.style.overflow = 'visible';
}
});
document.querySelector('#output').replaceChildren(canvas);The important relationship is that the rendering window is at least as large as the content you intend to include. Setting only height on the clone does not help if windowHeight remains a short viewport. Conversely, a large window cannot reveal content that an ancestor still clips.
Repair nested scrolling elements separately
A page-level window does not automatically expose the contents of a child with overflow:auto or overflow:scroll. Measure the actual scrolling child and alter that child in the clone:
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const scroller = target.querySelector('.results-scroll');
if (!scroller) {
throw new Error('The nested scrolling element was not found');
}
const contentWidth = scroller.scrollWidth;
const contentHeight = scroller.scrollHeight;
const canvas = await html2canvas(target, {
windowWidth: Math.max(target.scrollWidth, contentWidth),
windowHeight: Math.max(target.scrollHeight, contentHeight),
scrollX: 0,
scrollY: 0,
onclone: (doc) => {
const cloneScroller = doc.querySelector('.results-scroll');
cloneScroller.style.width = `${contentWidth}px`;
cloneScroller.style.height = `${contentHeight}px`;
cloneScroller.style.maxHeight = 'none';
cloneScroller.style.overflow = 'visible';
}
});Use the child dimensions when the child is the intended capture target. If the parent also has a fixed height, remove that parent constraint in onclone. Check every ancestor for clipping, not just the element returned by querySelector('#capture').
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Neutralize capture-only CSS without changing the live UI
Interactive layouts often rely on constraints that are correct for users but wrong for a document image. In the clone, remove or override:
height: 0, fixed heights, andmax-heightvalues that hide overflow;overflow: hidden, clipping, masks, or transforms that cut descendants;- collapsed panels or wrappers that are hidden solely for the live interaction state;
- off-screen positioning used for menus, drawers, or virtualized content;
containrules that prevent descendants from contributing to the measured box.
Apply these changes only to the cloned document. For broad rules, add a temporary style element:
onclone: (doc) => {
const style = doc.createElement('style');
style.textContent = `
#capture,
#capture * {
max-height: none !important;
}
#capture {
height: auto !important;
overflow: visible !important;
contain: none !important;
}
`;
doc.head.appendChild(style);
}Do not blindly force every descendant to overflow: visible. That can change intended visual effects or create enormous boxes. Override the specific scrolling or clipping ancestors identified by measurement.
Correct the scroll origin and responsive layout
Top-anchored full capture
Use scrollY: 0 and scrollX: 0 when the image should begin at the document’s top-left coordinate. A stale page offset can make a result look vertically shifted or truncated.
Viewport or fixed-position capture
If the purpose is to reproduce what a user sees at the current position, pass the intended page offset instead of forcing zero. Fixed headers and sticky elements can otherwise appear at the wrong position relative to the content.
Media queries
windowWidth affects responsive breakpoints. A width copied from a narrow browser viewport can activate a mobile layout whose cards wrap, collapse, or hide content. Set it to the width that represents the layout you want, then use the corresponding content height. Re-measure after clone styles are applied if a breakpoint changes the page structure.
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foreignObjectRendering
If foreignObjectRendering is enabled, test one run with it disabled. An issue has reported a mode-specific case in which the actual document viewport was used instead of supplied dimensions. Treat this as release-dependent: record your html2canvas version and compare both modes rather than assuming one is universally correct.
Rule out browser canvas limits
Extremely tall or wide canvases can be cut off or fail even after the layout is correct. Browsers impose maximum canvas area and dimension limits, and available memory varies by device. Signs include a correct DOM measurement but a blank, partially painted, or unexpectedly short canvas.
- Lower
scaleto reduce pixel dimensions and memory use. - Capture logical sections separately and stitch or display the tiles.
- Reduce unnecessary width before increasing height; total area is what matters.
- Test on the browsers and devices that will run the capture, not only on a desktop development machine.
A smaller scale changes output resolution; tiling changes the capture workflow. Choose the smallest change that preserves the image quality your use case needs.
A practical diagnostic workflow
- Confirm the target: verify that the selector resolves to the element containing the missing content.
- Record dimensions: compare
scrollHeightandclientHeight, including any nested scroller. - Capture from the intended origin: use zero offsets for a top-anchored document or explicit offsets for a viewport capture.
- Match the window: set
windowWidthandwindowHeightto the relevant scroll dimensions. - Open the clone: remove the identified fixed height, maximum height, clipping, hidden state, or containment rule in
onclone. - Check ancestors: inspect wrappers for
overflow:hidden,height:100%, and clipping. - Compare rendering modes: if foreign-object rendering is enabled, test the disabled path.
- Reduce output size: lower scale or tile the capture only after layout and coordinates are correct.
Common symptoms, causes, and fixes
| Symptom | Likely cause | Fix |
|---|---|---|
| Image ends exactly at the browser viewport | windowHeight is still the viewport height |
Set it to the target’s intended scroll height and use the matching clone dimensions. |
| Image ends at a card or panel boundary | Fixed height, max-height, or overflow:hidden |
Remove that constraint from the affected clone element and its clipping ancestor. |
| Only a table, feed, or results list is cut off | Nested overflow:auto container |
Measure the child, set its clone height to scrollHeight, and make its overflow visible. |
| Content is shifted or the top is missing | Incorrect scrollY or scrollX |
Use zero for a top-anchored capture or pass the deliberate page offset. |
| Layout changes after adding a large window | Media query triggered by windowWidth |
Choose the desired responsive width and re-measure the resulting clone. |
| Disabling clone edits fixes the image | The edit introduced a hidden or constrained state | Apply the smallest style override in onclone; do not alter the production DOM. |
| Correct dimensions but blank or truncated output | Canvas area or memory limit | Lower scale, reduce dimensions, or split into tiles. |
Performance and reliability considerations
Large captures cost time and memory before the canvas is encoded. Lazy-loaded images may not be present when measurement occurs, so wait until the content is loaded before reading scroll dimensions. Keep clone CSS narrow to avoid expensive reflow across the entire document. When using a delay or application-specific readiness signal, measure after that signal, not before it.
For repeatable jobs, log the target dimensions, window options, scroll origin, scale, html2canvas version, and whether foreign-object rendering was used. Those values make a crop reproducible. A successful DOM measurement does not guarantee a successful canvas if the final pixel area exceeds a browser limit.
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-d access_key=YOUR_API_KEY
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import requests
r = requests.get(
"https://api.screenshotneo.com/v1/shot",
params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"},
timeout=90,
)
r.raise_for_status()
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}`);
if (!res.ok) throw new Error(`Screenshot failed: ${res.status}`);
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FAQ
Should I set windowHeight to document.body.scrollHeight?
Only when the whole document is the intended target. For an element capture, use that element’s scroll dimensions; for a nested scroller, use the child’s dimensions and remove its clone overflow constraint.
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Why does the crop appear only on one browser?
Canvas limits, responsive breakpoints, and rendering-mode behavior can differ by browser and device. Compare the same dimensions, scale, and foreignObjectRendering setting, then test a smaller or tiled output.
Can I fix the problem by increasing scale?
No. A higher scale increases pixel dimensions and can make a canvas-limit failure worse. Correct the clone window and overflow rules first; lower scale only when the final canvas is too large.
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Frequently Asked Questions
Should I set windowHeight to document.body.scrollHeight?
Only when the whole document is the intended target. For an element capture, use that element’s scroll dimensions; for a nested scroller, use the child’s dimensions and remove its clone overflow constraint.
Why does the crop appear only on one browser?
Canvas limits, responsive breakpoints, and rendering-mode behavior can differ by browser and device. Compare the same dimensions, scale, and foreignObjectRendering setting, then test a smaller or tiled output.
Can I fix the problem by increasing scale?
No. A higher scale increases pixel dimensions and can make a canvas-limit failure worse. Correct the clone window and overflow rules first; lower scale only when the final canvas is too large.
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