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FileSaver.js

FileSaver.js implements the 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.

Supported Browsers

Browser Constructs as Filenames Size Dependancies
Firefox 20+ Blob Yes 800MiB/per None
Firefox ≤ 19 data: URI No Blob.js
Chrome Blob Yes 345MiB/per None
Chrome for Android v28+ Blob Yes None
IE 10+ Blob Yes 600MiB/per None
Opera Next Blob Yes None
Opera < 15 data: URI No Blob.js
Safari ≤ 6 data: URI No Blob.js

Note: Unlisted versions or browsers will probably work too; however only the ones listed above have been tested.

Feature detection is possible:

try { var isFileSaverSupported = !!new Blob(); } catch(e){}

Syntax

FileSaver saveAs(in Blob data, in DOMString filename)

Examples

Saving text

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.

Saving a canvas

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.

Aborting a save

var filesaver = saveAs(blob, "whatever");
cancel_button.addEventListener("click", function() {
    if (filesaver.abort) {
        filesaver.abort();
    }
}, false);

This isn't that useful unless you're saving very large files (e.g. generated video).

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