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To save a Raphaël.js drawing as an image, export the paper as SVG when you need scalable vector artwork. For PNG, rasterize the drawing’s SVG in the browser, draw it onto a canvas, and serialize the canvas. The Raphaël container is not itself a bitmap canvas, and the reviewed documentation does not establish a built-in current Raphaël PNG-export method. Check your Raphaël version and rendering mode before relying on an SVG-specific approach.
First, identify the paper—not just its container
Raphaël creates a paper in a container element. The paper is the drawing surface, with its own graphic dimensions; the surrounding <div> is not automatically a canvas or image. Keep a reference to the paper instance when you create it, because that is the object you will export or inspect.
A typical setup looks like this:
<div id="drawing"></div>
<script>
const paper = Raphael("drawing", 640, 400);
paper.rect(20, 20, 180, 100).attr({ fill: "#4b78c2", stroke: "none" });
paper.text(110, 70, "Raphaël drawing");
</script>Here, the paper is 640 by 400 units. Those are the dimensions of the drawing surface, not necessarily the physical display size of the containing element after CSS scaling. Choose export dimensions deliberately if the destination expects a particular pixel size.
Choose SVG or PNG based on where the image will go
| Format | Choose it when | Trade-off |
|---|---|---|
| SVG | The destination accepts vector artwork, such as a vector-capable editor or viewer. | It can scale without being tied to a fixed raster pixel size. SVG extraction depends on the paper being represented as SVG and on the export method you use. |
| PNG | The destination requires a raster image or a fixed pixel output. | You must rasterize the drawing. The result has fixed pixel dimensions, and canvas extraction can fail if the canvas is not origin-clean. |
If you do not need a raster format, SVG avoids the extra SVG-to-image-to-canvas conversion. If you do need PNG, use the browser canvas APIs for the rasterization and serialization steps.
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Export SVG when the drawing is available as SVG
One option is the third-party Raphaël.Export project, which describes a paper.toSVG() method that returns SVG markup. It is not a built-in current Raphaël method: the project’s repository was archived on April 8, 2020, so verify its compatibility with the Raphaël version and browser environment you actually use before depending on it.
With a compatible installation of that plugin, the basic pattern is:
const svgMarkup = paper.toSVG();
const blob = new Blob([svgMarkup], {
type: "image/svg+xml;charset=utf-8"
});
const svgUrl = URL.createObjectURL(blob);
const link = document.createElement("a");
link.href = svgUrl;
link.download = "raphael-drawing.svg";
link.click();
URL.revokeObjectURL(svgUrl);The plugin documentation also describes inserting the returned SVG string into an element. For a download, the example above wraps the string in an SVG Blob and uses a temporary object URL. If you control the page’s output flow, you can instead send the SVG string to your own application code and save it there.
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Do not treat this plugin example as proof that paper.toSVG() exists in every Raphaël release. If it is unavailable or incompatible, check the documentation for the version you use and the rendering surface your page actually creates. Avoid assuming that reaching into or changing Raphaël’s internal DOM is a stable export interface.
Convert an SVG drawing to PNG with canvas
For a browser PNG export, the general pipeline is: obtain SVG markup, turn it into an image source, load that source, draw it onto a canvas sized for the output, and serialize the canvas. This complete example assumes paper.toSVG() is available from a compatible export method. It triggers a PNG download:
async function downloadRaphaelPng(paper, width, height) {
const svgMarkup = paper.toSVG();
const svgBlob = new Blob([svgMarkup], {
type: "image/svg+xml;charset=utf-8"
});
const svgUrl = URL.createObjectURL(svgBlob);
const image = new Image();
try {
await new Promise((resolve, reject) => {
image.onload = resolve;
image.onerror = () => reject(new Error("Could not load the SVG image."));
image.src = svgUrl;
});
const canvas = document.createElement("canvas");
canvas.width = width;
canvas.height = height;
const context = canvas.getContext("2d");
if (!context) {
throw new Error("Could not create a 2D canvas context.");
}
context.drawImage(image, 0, 0, width, height);
const pngBlob = await new Promise((resolve, reject) => {
canvas.toBlob((blob) => {
if (blob) resolve(blob);
else reject(new Error("Could not encode the canvas as PNG."));
}, "image/png");
});
const pngUrl = URL.createObjectURL(pngBlob);
const link = document.createElement("a");
link.href = pngUrl;
link.download = "raphael-drawing.png";
link.click();
URL.revokeObjectURL(pngUrl);
} finally {
URL.revokeObjectURL(svgUrl);
}
}
// Use the intended PNG dimensions, not necessarily the CSS size of the div.
downloadRaphaelPng(paper, 1280, 800);This example uses canvas.toBlob() so the encoded PNG is handled as a Blob rather than as a large Base64 data URL string. If your application specifically needs a data URL, replace the Blob conversion with:
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const pngDataUrl = canvas.toDataURL("image/png");The browser canvas API returns a data URL, and PNG is its default format. A data URL is convenient when an API or UI needs an inline string, but it can use substantial memory for a large image because the encoded image is held in a string. Prefer a Blob when your next step is downloading or uploading a file.
Account for output size, scaling, and image content
Set the pixel dimensions explicitly
The canvas width and height determine the output bitmap dimensions. For a 640-by-400 paper, a 1280-by-800 canvas gives twice as many pixels in each dimension, but it does not guarantee that every external raster image in the drawing gains detail. Pick dimensions to suit the destination, and avoid needlessly enormous canvases: rasterization and encoding require memory.
Check external images before serialization
If the drawing includes external raster images, those resources must be served with appropriate cross-origin permission for canvas extraction. Drawing cross-origin content without the necessary permission can make the canvas non-origin-clean; when that happens, the browser prevents image extraction, including serialization with toDataURL() or the Blob workflow.
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Test with the actual images and hosting configuration used in production. A drawing made only of vector shapes may export successfully while a version that embeds a remote image fails at the serialization step.
Verify the rendering mode
Raphaël documentation describes SVG and a VML path for legacy browsers. An SVG-specific export workflow therefore cannot be assumed to work in every environment where Raphaël can render. Check what the current browser produced and test the export in each browser or rendering mode your application supports. If SVG is a requirement, constrain support to an environment that actually supplies the expected SVG representation.
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If what you need is a screenshot of the page showing the drawing—not a standalone exported asset from the paper—you can capture the page with ScreenshotNeo. A page screenshot and a Raphaël export are different outputs: the former captures rendered page content, while SVG or canvas export gives your application an image derived from the drawing surface.
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Troubleshoot common export failures
paper.toSVG is not a function: That method is associated with the third-party export plugin, not established as a built-in current Raphaël API. Confirm that the plugin is loaded, its version supports your Raphaël version, and the paper instance is the one you expect.- The paper or export is blank: Confirm that drawing commands have run before export, that the paper has the expected dimensions, and that the SVG image has loaded before calling
drawImage(). The example waits for the image load event for this reason. toDataURL()ortoBlob()throws a security error: Check for external raster images and verify their server’s cross-origin response configuration. A canvas made non-origin-clean cannot be read back as an image.- The output is clipped or the wrong size: Set canvas width and height to the intended output pixels and make sure the SVG viewBox or exported dimensions cover the full drawing. CSS sizing of the container does not automatically define the bitmap dimensions.
- The SVG route does not work in an older browser: Check whether the page is using Raphaël’s legacy VML rendering path rather than SVG. Do not assume an SVG DOM exists simply because Raphaël is drawing successfully.
- Large exports stall or consume too much memory: Reduce the output dimensions to what the destination needs and prefer
toBlob()to avoid retaining a Base64 data URL string. Confirm that the browser can handle the chosen dimensions and content.
Practical implementation checklist
- Keep the paper object returned by
Raphael(...); do not mistake the surrounding container for the drawing surface. - Choose SVG for vector-compatible destinations and PNG when a raster file is required.
- For SVG, verify the export method and its compatibility;
paper.toSVG()in the cited plugin is not guaranteed to be a built-in method. - For PNG, rasterize the SVG into a canvas with explicit pixel dimensions, wait until the image has loaded, then use
toBlob()ortoDataURL(). - Test external images for cross-origin restrictions and test the exact browser/rendering mode used by the application.
Frequently Asked Questions
Does the outer div contain the PNG data?
No. It contains the rendered Raphaël paper; PNG generation is a separate rasterization and serialization step.
Is Raphaël.Export maintained as a current official Raphaël feature?
No. It is a third-party project, and its repository was archived on April 8, 2020.
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