A blank or half-rendered dom-to-image result usually means one stage of its export pipeline failed—not that the visible page is empty. Check, in order: page readiness, target visibility, external assets and CORS, SVG/canvas handling, browser support, and output dimensions. The fixes below help you identify the failing stage and correct it without guessing.
Why a page that looks normal can produce a blank image
dom-to-image does not photograph the browser’s already-painted pixels. It recursively clones the selected DOM node, copies computed styles, rebuilds pseudo-elements, embeds fonts and images, serializes the clone as XML inside an SVG foreignObject, and (for PNG or JPEG) rasterizes that SVG in an off-screen canvas. A failure in any intermediate step can leave the final image empty or truncated even though the live page looks correct.
The original project and maintained compatible forks differ in browser behavior and options. Confirm which package and version your application uses before applying a workaround; historical browser statements in the original README should not be treated as a current support matrix.
Use this isolation sequence first
- Capture only after the intended state exists. Wait for the target node, layout, injected stylesheets, fonts, and lazy content.
- Verify the selected node and its box. Check that it is the element you expect and that its width and height are greater than zero.
- Test external resources. Inspect network and console errors for images, fonts, and stylesheets, especially cross-origin requests.
- Test special content separately. WebGL, video, and cross-origin iframes have restrictions that ordinary DOM content does not.
- Reduce the output. Try a smaller element or lower scale to rule out canvas dimension limits.
- Compare a supported browser and package version. If the same node works elsewhere, the problem may be SVG
foreignObjectbehavior or a fork-specific implementation detail.
1. Wait for the real page state
Calling the library immediately after inserting markup is a common cause of an empty capture. The target may exist before its stylesheet, web font, image, or lazy component has finished loading.
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Wait for stylesheets and fonts
If you inject a stylesheet, await its load event before capturing. The maintained fork waits for fonts already loading through document.fonts.ready, but it cannot wait for a stylesheet that has not started or finished loading.
function waitForStylesheet(link) {
if (link.sheet) return Promise.resolve();
return new Promise((resolve, reject) => {
link.addEventListener('load', resolve, { once: true });
link.addEventListener('error', () => reject(new Error(`Stylesheet failed: ${link.href}`)), { once: true });
});
}
async function readyForCapture(root, stylesheetLinks = []) {
await Promise.all(stylesheetLinks.map(waitForStylesheet));
if (document.fonts?.ready) await document.fonts.ready;
await new Promise(requestAnimationFrame);
await new Promise(requestAnimationFrame);
if (!root || root.getBoundingClientRect().width === 0 || root.getBoundingClientRect().height === 0) {
throw new Error('Capture root has no layout size');
}
}Also trigger or await lazy content before capture. A library cannot render content that your application has not yet added to the DOM.
2. Check visibility, dimensions, and ancestors
A root with display:none or opacity:0 may have no useful capture box or may be intentionally hidden. Verify the element selected by your query and inspect its computed style and rectangle:
const root = document.querySelector('#receipt');
const rect = root?.getBoundingClientRect();
console.log({
root,
display: root && getComputedStyle(root).display,
opacity: root && getComputedStyle(root).opacity,
width: rect?.width,
height: rect?.height
});The maintained fork offers ensureShown for a hidden capture root. That option cannot reveal a hidden ancestor above the root. Temporarily reveal or move the ancestor, then capture. Avoid using visibility:hidden, collapsed containers, zero-sized flex children, or a selector that matches a template rather than the rendered component.
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3. Diagnose images, fonts, and other external assets
Every external resource must be fetched and embedded into the clone. A bad URL, missing credentials, blocked request, or cross-origin policy can break that process. Open the browser’s Network and Console panels and look for 404/403 responses, CORS errors, certificate failures, and requests that are still pending when capture begins.
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Cross-origin images
Browser security prevents JavaScript from reading pixels from an image that lacks suitable CORS permission. A client-side library cannot grant itself that permission. Serve the image with an appropriate Access-Control-Allow-Origin response, use a controlled same-origin proxy, or use the maintained fork’s documented requestInterceptor/corsImg facilities. Credentials and allowed origins must match your deployment.
As a diagnostic, replace external images with a same-origin test asset. If the capture then works, fix delivery rather than changing canvas code. The maintained fork documents that broken content images can be skipped so the rest of the image renders; attach a rejection handler because errors during final rasterization can still reject the promise.
domtoimage.toPng(root)
.then(dataUrl => {
const img = new Image();
img.src = dataUrl;
document.body.appendChild(img);
})
.catch(error => {
console.error('dom-to-image capture failed', error);
});Fonts and CSS
Missing font files can change layout or prevent the clone from completing. Confirm that font requests succeed, await document.fonts.ready, and ensure stylesheets are accessible from the page that performs the capture. A stylesheet loaded from an origin that refuses access can leave the clone visually incomplete.
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WebGL
WebGL drawing buffers may be cleared before the library reads them. The maintained fork requires the context to be created with preserveDrawingBuffer: true when you need a snapshot:
const gl = canvas.getContext('webgl', { preserveDrawingBuffer: true });You must set this at context creation; enabling it later cannot restore an already-created buffer.
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Video
Video frames are not captured reliably by this pipeline. Use an accessible poster image or draw an allowed frame into a same-origin canvas, then capture that replacement.
Cross-origin iframes
Content inside an iframe from another origin is not readable by page JavaScript. Capture a representation you control, use a same-origin integration, or perform the capture in a context with access to the content. Do not expect a DOM clone to bypass the browser’s same-origin policy.
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Tainted canvases
If a canvas contains pixels from a source without CORS permission, reading it can fail. Fix the source headers or proxy the asset; changing the dom-to-image call does not remove the restriction.
5. Reduce oversized captures and partial output
Browsers impose implementation-dependent limits on canvas dimensions and total pixel area. Excessive scale can produce a blank canvas, an image that stops halfway, or a rejected promise. Test the smallest useful case first, then increase dimensions gradually.
- Capture a child region instead of the entire page.
- Lower the library’s
scaleorpixelRatiooption. - Split a long document into several regions and combine them server-side or in a separate image step.
- Remove unnecessary shadows, huge gradients, and off-screen content while diagnosing.
The maintained fork reports clamping an excessive multiplier and logging a warning. That behavior is fork-specific; do not assume every dom-to-image release handles oversized output the same way. The general html2canvas FAQ likewise warns that oversized canvases can be blank or partial, which is useful evidence for the class of failure but not a guarantee about a particular dom-to-image version.
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6. Browser and package differences
SVG foreignObject support and security rules vary by browser. The original project describes Safari as unsupported because of stricter foreignObject security; the maintained fork calls Safari unreliable and suggests generating SVG and rasterizing it server-side. Treat this as a compatibility limitation, not a missing CSS declaration.
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Practical diagnostic matrix
| Symptom | Likely stage | Next check |
|---|---|---|
| Completely blank output | Readiness, hidden root, CORS, WebGL, or canvas size | Log dimensions, replace external assets, lower scale |
| Only fonts or images missing | Resource embedding | Inspect network responses and await fonts/stylesheets |
| Bottom half is cut off | Canvas dimensions or clone layout | Capture a smaller region and reduce scale |
| Works in one browser only | foreignObject or browser security |
Check fork support and generate SVG/server-render |
| WebGL area is empty | Discarded drawing buffer | Create the context with preserveDrawingBuffer: true |
| Promise rejects at the end | Final rasterization | Catch the error and inspect tainted or oversized canvas causes |
Client-side capture versus server-side rendering
Client-side dom-to-image is convenient when the page, assets, and browser context are under your control. It is less suitable when you need broad browser consistency, inaccessible third-party content, or very large output. A server-side browser renderer can load a page in a controlled environment and avoid many client CORS and foreignObject differences, but it adds infrastructure, authentication, waiting, and cost considerations. Choose based on access to source assets, required browser coverage, output size, and deployment architecture rather than assuming one approach is universally best.
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When to replace dom-to-image
Keep the library when you control the page and need a browser-side export. Consider a maintained fork when its fixes and options match your application. Move to server-side rendering when Safari or cross-origin restrictions are decisive, when output is consistently too large, or when you need repeatable captures outside a user’s browser. In every case, first prove whether the failure is readiness, visibility, resources, special content, rasterization, or dimensions; that diagnosis determines the least disruptive fix.
Frequently Asked Questions
Why is the produced canvas empty or cuts off halfway through?
That wording describes two different failures: an empty canvas usually points to hidden or not-ready content, blocked resources, WebGL buffer loss, or an excessive canvas size; a halfway image most often requires reducing capture dimensions or scale and checking the clone’s layout.
Can dom-to-image capture a cross-origin iframe?
No. Browser same-origin rules prevent the page from reading another origin’s iframe contents. Use a same-origin integration, an accessible representation, or a rendering context that has permission to access the content.
Should I use PNG, JPEG, or SVG while debugging?
Try SVG first to separate cloning and serialization from canvas rasterization. If SVG is correct but PNG or JPEG is not, investigate canvas security, WebGL preservation, and output dimensions.
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