Extra white space at the bottom of an html2canvas image usually means the capture area is taller than the content you intended to keep—not that html2canvas has a universal “trim whitespace” bug. Measure the target element and the returned canvas first. Then choose the remedy that matches your intent: size the cloned viewport to the element for a complete scrollable capture, capture a smaller content node, or define an explicit crop with x, y, width, and height. Also test the page at the top and bottom because a version-specific issue report associated one blank offset with scroll position.
Start by measuring the pixels you actually captured
Do not begin by subtracting an arbitrary number of pixels. The “blank” area may be legitimate overflow, a wrapper’s reserved height, a responsive-layout change, or a browser canvas-limit failure. Log the selected node, its layout dimensions, and the canvas dimensions:
const element = document.querySelector('#capture');
const rect = element.getBoundingClientRect();
console.table({
rectHeight: rect.height,
clientHeight: element.clientHeight,
scrollHeight: element.scrollHeight,
rectWidth: rect.width,
clientWidth: element.clientWidth,
scrollWidth: element.scrollWidth,
pageScrollX: window.scrollX,
pageScrollY: window.scrollY
});
const canvas = await html2canvas(element);
console.table({
canvasWidth: canvas.width,
canvasHeight: canvas.height
});getBoundingClientRect().heightis the element’s visible border-box height at the current scale and scroll position.clientHeightis the inner height, generally excluding borders and including the element’s visible padding.scrollHeightincludes content that overflows vertically and is the relevant target when you want the entire scrollable element.- The canvas dimensions show what html2canvas actually allocated, which can be larger than the visible box.
If you passed document.body, a page shell, or a wrapper with intentional empty space, the canvas may be accurately reproducing that larger node. The html2canvas examples demonstrate selecting a specific element; use the smallest node that contains the content you want.
Choose the fix based on the intended output
Capture the complete scrollable element
For a full capture of a scrollable component, set the cloned rendering viewport to the element’s scroll dimensions:
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const element = document.querySelector('#capture');
const canvas = await html2canvas(element, {
windowWidth: element.scrollWidth,
windowHeight: element.scrollHeight
});
document.body.appendChild(canvas);This is the approach recommended in the official html2canvas FAQ when a full-element capture is blank or cut off. windowWidth and windowHeight describe the cloned page’s viewport; they are not a whitespace-cropping switch. Because viewport dimensions can trigger different CSS media queries, inspect the result at the new width and height. A breakpoint may legitimately change wrapping, columns, or component height and therefore change the image.
Capture a smaller node instead of a tall wrapper
If the content occupies only part of a card or page shell, move the selector to the content node:
const content = document.querySelector('#capture-content');
const canvas = await html2canvas(content);
const png = canvas.toDataURL('image/png');Removing an outer element with a fixed height, min-height, bottom padding, or reserved footer space is safer than trimming the finished bitmap. Check computed styles in DevTools for those properties and for absolutely positioned children that extend the wrapper’s scrollable area.
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Crop to a deliberately measured region
When the desired output is a subregion, use html2canvas’s crop options. The configuration reference documents x, y, width, and height; the values must describe the pixels you intend to retain:
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const rect = element.getBoundingClientRect();
const cropX = rect.left;
const cropY = rect.top;
const cropWidth = rect.width;
const cropHeight = /* measured content height, not an arbitrary subtraction */ rect.height;
const canvas = await html2canvas(element, {
x: cropX,
y: cropY,
width: cropWidth,
height: cropHeight
});Use coordinates derived from the intended boundary. A crop that is too short hides the same pixels you were trying to preserve. Verify at the browser zoom and device-pixel ratio used in production; a CSS-pixel measurement and a bitmap-pixel measurement are not interchangeable when scaling is involved. See the official configuration reference for the complete option set.
Check scroll position before changing CSS
Re-run the exact capture at the top and at the bottom of the page:
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window.scrollTo({ top: 0, left: 0 });
const topCanvas = await html2canvas(document.querySelector('#capture'), {
scrollX: window.scrollX,
scrollY: window.scrollY
});
window.scrollTo({ top: document.documentElement.scrollHeight, left: 0 });
const bottomCanvas = await html2canvas(document.querySelector('#capture'), {
scrollX: window.scrollX,
scrollY: window.scrollY
});A 2019 issue report for html2canvas 1.0.0-rc.3 described a large blank offset when the reporter had scrolled to the bottom and said that returning to the top fixed that example. It is evidence of a diagnostic possibility, not proof that scrolling causes every bottom gap or that the report applies to current releases. If your result changes with scroll position, make scrollX and scrollY explicit and inspect fixed-position elements. These options matter when rendering content such as sticky headers or fixed overlays.
Distinguish extra layout from an oversized canvas
If the image is both unusually tall and partly blank or cut off, investigate browser canvas limits before cropping. The FAQ warns that maximum canvas dimensions vary by browser and platform. When a canvas exceeds a limit, “the browser silently produces a blank or partially rendered output without throwing an error,” which makes the failure difficult to diagnose. The guidance is not a stable cross-device threshold.
- Capture a shorter section and compare the result.
- Reduce the target’s width, height, or scale and see whether rendering becomes complete.
- Split a very tall document into sections rather than allocating one enormous bitmap.
- Record browser, operating system, viewport, device-pixel ratio, html2canvas version, and canvas dimensions when reporting the problem.
A true layout gap normally appears consistently at the element boundary. A canvas-limit failure often produces missing content as well as blank pixels.
Use onclone for a narrow, capture-only adjustment
The configuration reference includes onclone, which runs after html2canvas clones the document and before it renders. It lets you change the cloned element without modifying the live page:
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const element = document.querySelector('#capture');
const canvas = await html2canvas(element, {
onclone: (clonedDocument) => {
const cloned = clonedDocument.querySelector('#capture');
if (!cloned) return;
// Example: remove a known capture-only spacer.
cloned.querySelector('.capture-spacer')?.remove();
}
});Keep this override specific. Do not apply a global reset or broad height rule that makes the clone unlike the page users see. First identify the exact spacer, padding, fixed-height shell, or component responsible, then change only that node in the clone.
Common causes and targeted fixes
| Symptom | Likely explanation | What to try |
|---|---|---|
| Canvas matches a tall page shell | The selected node includes reserved height or a footer area. | Capture the content child or remove the intentional spacer in onclone. |
| Content below the fold is missing | The cloned viewport is shorter than the scrollable element. | Set windowWidth and windowHeight to scrollWidth and scrollHeight. |
| Gap changes after resizing | A media query changes the cloned layout. | Use a deliberate viewport and inspect responsive breakpoints before cropping. |
| Gap appears only at page bottom | Scroll state, fixed elements, or a version-specific rendering issue may be involved. | Compare top and bottom captures and set scrollX/scrollY explicitly. |
| Bottom and other regions are blank or clipped | The bitmap may approach a browser/platform canvas limit. | Reduce size or split the capture; check the FAQ’s platform-specific warnings. |
| Irregular spacing inside text or a component | Font, CSS, or a renderer-version difference rather than extra bottom height. | Reproduce with a minimal node and check fonts and version. |
A 2022 issue reports variable spacing with html2canvas 1.4.1 but does not establish a generally applicable fix. Treat issue reports as clues for a controlled reproduction, not as guarantees.
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- Confirm the selector. Log the node and make sure it is not
body, an application shell, or a wrapper with intentional empty height. - Record dimensions. Compare bounding-rectangle height,
clientHeight,scrollHeight, and canvas height. - Decide what “correct” means. Choose full scrollable content, the visible box, or a measured subregion.
- Set viewport dimensions for full output. Use the FAQ pattern, then check for media-query changes.
- Test scroll states. Capture at the top and bottom with explicit scroll options.
- Try a minimal target. Remove unrelated overlays, fonts, animations, and large siblings to isolate the renderer.
- Check size limits. If the canvas is very large or partly blank, reduce it or split it before changing layout.
- Apply
oncloneonly after diagnosis. Remove or resize the exact cloned node that creates the unwanted height.
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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)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 always set windowHeight to scrollHeight?
No. Do it when the intended image includes the complete scrollable element. For a viewport-sized screenshot, keep the viewport appropriate to that design and use a measured crop or a smaller target when necessary.
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Can CSS overflow: hidden remove the white area?
Only if overflow is the reason the selected element is taller than the intended content, and it may hide real content. Measure first; do not use it as a blind fix.
Why does a screenshot service help with this particular problem?
It moves rendering to a managed capture endpoint, so you do not have to maintain html2canvas viewport, scroll, clone, and canvas-limit handling in your page. It does not repair an html2canvas canvas you already generated.
Frequently Asked Questions
Does changing the output image format remove bottom whitespace?
No. PNG, JPEG, and WebP encode the pixels that were captured; changing format does not change the capture rectangle or layout.
What should I include in a bug report?
Provide a minimal reproducible page, the exact html2canvas version, browser and operating system, viewport and device-pixel ratio, scroll position, capture options, target dimensions, and the resulting canvas dimensions.
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