FileSaver.js implements the HTML5 W3C saveAs()
FileSaver interface in browsers that do
not natively support it. There is a FileSaver.js demo that demonstrates saving
various media types.
FileSaver.js is the solution to saving files on the client-side, and is perfect for webapps that need to generate files, or for saving sensitive information that shouldn't be sent to an external server.
Looking for canvas.toBlob()
for saving canvases? Check out
canvas-toBlob.js for a cross-browser implementation.
Browser | Constructs as | Filenames | Max Blob Size | Dependencies |
---|---|---|---|---|
Firefox 20+ | Blob | Yes | 800MiB | None |
Firefox ≤ 19 | data: URI | No | n/a | Blob.js |
Chrome | Blob | Yes | 345MiB | None |
Chrome for Android | Blob | Yes | ? | None |
IE 10+ | Blob | Yes | 600MiB | None |
Opera Next | Blob | Yes | ? | None |
Opera < 15 | data: URI | No | n/a | Blob.js |
Safari 6.1+* | Blob | No | ? | None |
Safari < 6 | data: URI | No | n/a | Blob.js |
Feature detection is possible:
try { var isFileSaverSupported = !!new Blob(); } catch(e){}
It is possible to save HTML documents (and only HTML documents) in IE < 10 without Flash-based polyfills. See sudodoki's comment for more information on how to accomplish this.
Blobs may be opened instead of saved sometimes—you may have to direct your Safari users to manually press ⌘+S to save the file after it is opened. Further information is available on the issue tracker.
FileSaver saveAs(in Blob data, in DOMString filename)
var blob = new Blob(["Hello, world!"], {type: "text/plain;charset=utf-8"});
saveAs(blob, "hello world.txt");
The standard W3C File API Blob
interface is not available in all browsers.
Blob.js is a cross-browser Blob
implementation that solves this.
var canvas = document.getElementById("my-canvas"), ctx = canvas.getContext("2d");
// draw to canvas...
canvas.toBlob(function(blob) {
saveAs(blob, "pretty image.png");
});
Note: The standard HTML5 canvas.toBlob()
method is not available in all browsers.
canvas-toBlob.js is a cross-browser canvas.toBlob()
that polyfills this.
var filesaver = saveAs(blob, "whatever");
cancel_button.addEventListener("click", function() {
if (filesaver.abort) {
filesaver.abort();
}
}, false);
This is only useful when you're saving very large files (e.g. generated video).