This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The OffscreenCanvas.convertToBlob()
method creates a Blob
object representing the image contained in the canvas.
Syntax
Promise<Blob> OffscreenCanvas.convertToBlob(options);
Parameters
options
Optional-
You can specify several options when converting your
OffscreenCanvas
object into aBlob
object, for example:const blob = offscreenCanvas.convertToBlob({ type: "image/jpeg", quality: 0.95 });
options:
Return value
A Promise
returning a Blob
object representing the image contained in the canvas.
Examples
var offscreen = new OffscreenCanvas(256, 256); var gl = offscreen.getContext("webgl"); // ... some drawing using the gl context ... offscreen.convertToBlob().then(function(blob) { console.log(blob); }); // Blob { size: 334, type: "image/png" }
Specifications
Currently drafted as a proposal: OffscreenCanvas.
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
convertToBlob | Chrome Full support 69 | Edge Full support ≤79 | Firefox
Partial support
46
| IE No support No | Opera Full support 56 | Safari No support No | WebView Android No support No | Chrome Android Full support 69 | Firefox Android
Partial support
46
| Opera Android Full support 48 | Safari iOS No support No | Samsung Internet Android Full support 10.0 |
Legend
- Full support
- Full support
- Partial support
- Partial support
- No support
- No support
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.
- See implementation notes.
- See implementation notes.
- User must explicitly enable this feature.
- User must explicitly enable this feature.
- Uses a non-standard name.
- Uses a non-standard name.
See also
- The interface defining this method,
OffscreenCanvas
.