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Set html2canvas’s scale option when you render, then call toDataURL() on the returned canvas. Use scale: 1 when CSS pixels must become the exact canvas dimensions; use window.devicePixelRatio (the library default) or another deliberate value for a sharper, supersampled image.
const element = document.querySelector('#capture');
const canvas = await html2canvas(element, {
scale: window.devicePixelRatio
});
const dataUrl = canvas.toDataURL('image/png');The important detail is that scaling happens during rendering. Resizing the canvas after html2canvas() has finished cannot recreate detail that was never rendered.
What scale changes
html2canvas reconstructs the selected DOM element in a canvas. The scale configuration controls the rendering resolution: a CSS region rendered at 800 by 600 with scale: 1 produces an 800 by 600 canvas, while scale: 2 renders about 1,600 by 1,200 pixels. The CSS layout can remain the same on screen; only the internal bitmap gets more pixels.
More pixels generally make text, borders and fine artwork look sharper when the exported image is displayed at its CSS size or printed. They also increase the work required to paint, the canvas memory footprint and the amount of data passed to the encoder.
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Choose the scale for the result you need
scale: 1: Use this for predictable one-CSS-pixel-to-one-canvas-pixel output and for a fixed pixel contract.scale: window.devicePixelRatio: A practical high-DPI choice. On a device-pixel-ratio 2 display, the same CSS area is rendered at roughly twice the width and height.- A value below 1: Reduces pixel count and memory use when a thumbnail or small preview is sufficient, with a corresponding loss of detail.
- A chosen value above 1: Supersamples consistently across machines, but can make large captures expensive. Pick a limit that fits your target dimensions rather than blindly using the largest number.
Exact dimensions versus sharper output
Decide whether your priority is a pixel size or visual density before writing the options.
| Goal | Configuration | What to expect |
|---|---|---|
| Canvas pixels equal the CSS dimensions | scale: 1 |
An element laid out at 800 × 600 CSS pixels yields approximately 800 × 600 canvas pixels. |
| Sharper image at the same displayed size | scale: window.devicePixelRatio |
On a DPR 2 display, the canvas is approximately twice as wide and twice as tall as the CSS region. |
| Known output dimensions | Set width, height and scale: 1 |
Use when a downstream system requires a fixed 800 × 600-style bitmap. |
| Small preview or constrained memory | A scale below 1 | Fewer pixels and a smaller encode, at the cost of detail. |
“Approximately” matters because layout can include fractional CSS pixels, borders, transforms and other browser rounding. Always inspect the actual canvas.width and canvas.height attributes rather than inferring them from CSS.
Set a fixed output size
If the consumer requires a particular bitmap size, provide dimensions to html2canvas and keep the scale explicit:
const element = document.querySelector('#capture');
const canvas = await html2canvas(element, {
width: 800,
height: 600,
scale: 1
});
console.log(canvas.width, canvas.height); // Check the actual result
const dataUrl = canvas.toDataURL('image/png');width and height describe the capture area in CSS pixels. The resulting attributes are the authoritative export dimensions. If the element is naturally smaller or larger, verify the rendered result and adjust the capture region or layout rather than assuming the options will crop or stretch every child exactly as intended.
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Inspect dimensions before exporting
Debug size problems immediately after rendering:
const canvas = await html2canvas(document.querySelector('#capture'), {
scale: 1
});
console.log({
pixelWidth: canvas.width,
pixelHeight: canvas.height,
cssWidth: canvas.width / 1,
cssHeight: canvas.height / 1
});
const dataUrl = canvas.toDataURL('image/png');When using another scale, divide by that scale only as a rough comparison to the intended CSS area; the canvas attributes remain the source of truth. Check them in the same browser and viewport that will run the export, because responsive layout and device-pixel ratio affect the result.
Export with toDataURL()
PNG for lossless detail
PNG is the straightforward lossless choice for interfaces, text, diagrams and screenshots:
const canvas = await html2canvas(document.querySelector('#capture'), {
scale: window.devicePixelRatio
});
const dataUrl = canvas.toDataURL('image/png');The returned value is a data URL containing the encoded image. It is convenient for an <img> element or a small download, but it keeps the entire encoded image in a JavaScript string.
JPEG or another supported type
The Canvas API accepts a MIME type and, for formats such as JPEG, a quality value from 0 to 1:
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const canvas = await html2canvas(document.querySelector('#capture'), {
scale: 1
});
const jpegUrl = canvas.toDataURL('image/jpeg', 0.85);
const webpUrl = canvas.toDataURL('image/webp', 0.85);JPEG is useful when photographic content and a smaller file matter more than lossless text edges. Browser support for an output type is not guaranteed; if the requested type is unsupported, browsers fall back to PNG. Treat the returned URL’s MIME prefix as the final indication of what was produced.
Use toBlob() for large captures
toDataURL() creates the whole encoded image in memory and can produce a very long string. For large images, use a Blob and an object URL instead:
const canvas = await html2canvas(document.querySelector('#capture'), {
scale: window.devicePixelRatio
});
canvas.toBlob((blob) => {
if (!blob) {
throw new Error('The browser could not encode the canvas');
}
const objectUrl = URL.createObjectURL(blob);
const link = document.createElement('a');
link.href = objectUrl;
link.download = 'capture.png';
link.click();
URL.revokeObjectURL(objectUrl);
}, 'image/png');This avoids placing the entire encoded file in a data URL. Keep the object URL alive until the browser has started using it; revoke it afterward.
How scale affects memory and performance
Scale multiplies both dimensions, so pixel count grows roughly with the square of the scale. Doubling the scale is not a two-percent adjustment: it can require about four times as many pixels for the same CSS area. Painting, transferring and encoding therefore take longer, and a very large canvas can exhaust browser limits.
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- Start with
scale: 1to establish a working baseline. - Increase to the device pixel ratio or a smaller fixed value only if the result needs more detail.
- Capture the smallest useful element instead of an entire page when possible.
- Prefer
toBlob()for large output and avoid retaining multiple data URLs at once. - Measure
canvas.width,canvas.height, encode time and file size in the target browsers.
Cross-origin images and tainted canvases
html2canvas cannot bypass the browser’s same-origin protections. An image loaded from another origin must provide a suitable Access-Control-Allow-Origin response header if you want to draw it and export the canvas. You can ask html2canvas to attempt CORS loading:
const canvas = await html2canvas(document.querySelector('#capture'), {
scale: 1,
useCORS: true
});
const dataUrl = canvas.toDataURL('image/png');useCORS: true is not a workaround by itself. It works only when the image server permits your page’s origin (or otherwise sends an appropriate CORS header). If it does not, serve the asset through a same-origin proxy you control, replace it with a same-origin copy, or omit that asset. Drawing a disallowed image can taint the canvas, after which export may throw a security error or become unreadable.
Fidelity limits of html2canvas
html2canvas is a DOM reconstruction tool, not the browser’s native screenshot facility. It draws the properties and resources it understands, so unsupported CSS, unusual filters, complex blending, video frames, browser chrome and some form-control details can differ from the live page. Raising scale improves sampling of what html2canvas rendered; it cannot make an unsupported property appear or correct a layout mismatch.
For a faithful check, compare the export at the same viewport, loaded-font state and responsive breakpoint as the page you are testing. Wait until images and fonts needed by the element are available before invoking html2canvas, and capture a specific element when full-page layout introduces unnecessary complexity.
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Canvas-size failures and the data:, result
Browsers impose maximum canvas dimensions. If a canvas has zero width or height, or exceeds the browser’s maximum, toDataURL() can return the literal data:, value instead of an image. This is a size failure, not evidence that PNG encoding succeeded.
- Log
canvas.widthandcanvas.height. - Lower
scaleand try again. - Capture a smaller region or split a long page into sections.
- Use
toBlob()for the remaining large exports.
Common problems and fixes
| Symptom | Likely cause | Fix |
|---|---|---|
| Image looks blurry | Internal resolution is too low for its display size. | Increase scale or use window.devicePixelRatio; confirm the image is not being enlarged again by CSS. |
| Export has unexpected dimensions | Device-pixel ratio, fractional layout or explicit width/height differs from your assumption. | Inspect canvas.width and canvas.height; use scale: 1 for a CSS-pixel contract. |
SecurityError during export |
A cross-origin image tainted the canvas. | Use useCORS: true only with server-side CORS headers, or proxy the asset through your origin. |
Returned value is data:, |
Zero dimensions or a canvas beyond browser limits. | Reduce scale, reduce the capture region or split the capture. |
| Large page freezes or crashes | Too many pixels and an in-memory data URL. | Lower scale, capture in pieces, use toBlob() and release object URLs. |
| CSS differs from the page | html2canvas does not implement every browser-rendered feature. | Simplify unsupported styling, provide alternatives, or use a browser screenshot service when native rendering is required. |
Or skip the browser setup
If you need a rendered website image rather than a canvas inside your own page, ScreenshotNeo accepts one request and returns PNG, JPEG, WebP or PDF. It handles the browser session for you and can apply options such as full-page capture with lazy images loaded, element selection by CSS selector, dark mode, device presets or custom viewports, retina scale, custom CSS and JavaScript, click-before-capture, selector waits, delays, network-idle waits, request and resource blocking, headers, cookies, user agents, authorization, timezone, geolocation, transparent backgrounds, resizing, chosen-TTL caching, signed image links, asynchronous jobs with signed webhooks and bulk capture of up to 100 URLs per call. The API also accepts parameter names used by other screenshot APIs, which can simplify migration. See the ScreenshotNeo API documentation for the complete option list.
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Equivalent requests in Python and Node.js
These examples call the same endpoint and save the response bytes. The API key and target URL are the only values you need to replace.
Python
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}`);
const fs = await import('node:fs/promises');
await fs.writeFile('shot.webp', Buffer.from(await res.arrayBuffer()));Practical decision checklist
- Need exact CSS-to-pixel dimensions? Set
scale: 1and verify the canvas attributes. - Need a sharper image at its displayed size? Use the device pixel ratio or a measured fixed scale.
- Need a smaller file? Lower scale, choose JPEG/WebP where appropriate, or reduce quality.
- Seeing missing images or export security errors? Resolve CORS before changing scale.
- Hitting memory or maximum-dimension limits? Reduce the region or scale, split the job and prefer
toBlob(). - Need a native browser rendering workflow outside your page? Use ScreenshotNeo’s API or MCP server instead of adding browser automation to your application.
Frequently Asked Questions
Does changing CSS width after rendering change the exported pixel dimensions?
No. The exported dimensions are set by the canvas bitmap created by html2canvas. Set the render options first and verify canvas.width and canvas.height.
Is a higher scale always better?
No. It can sharpen detail, but it also increases pixel count, memory use, encoding time and the chance of exceeding browser canvas limits.
Can html2canvas capture a page exactly like a browser screenshot?
Not always. It reconstructs supported DOM and CSS into a canvas, so unsupported styling and some browser-rendered content can differ.
The Bottom Line
Set scale while calling html2canvas: use 1 for exact CSS-pixel dimensions, or a deliberate higher value such as window.devicePixelRatio for sharper output. Check the actual canvas dimensions, resolve CORS first, and switch to toBlob() or a smaller capture when memory and canvas limits become the problem.
Quick Recap
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