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

• Internet Explorer 10+
  • Up to 600 MiB per blob
  • Supports filenames
• Firefox
  • Up to 800 MiB per blob
  • Supports filenames
• Google Chrome
  • Up to 345 MiB per blob
  • Supports filenames
• Google Chrome for Android Beta
  • Supports filenames
• Opera Next
  • Supports filenames
• Safari 5+
  • Requires Blob.js
  • Does not support filenames
• Opera ≤15
  • Requires Blob.js
  • Does not support filenames
• Firefox <4
  • Requires Blob.js
  • Does not support filenames

Unlisted future versions of browsers will probably work too; I just haven't tested them.

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() implementation that solves 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).