Never-ending Pumpkin Mulch


    1.0.1 • Public • Published


    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.

    Supported browsers

    Browser Constructs as Filenames Max Blob Size Dependencies
    Firefox 20+ Blob Yes 800 MiB None
    Firefox < 20 data: URI No n/a Blob.js
    Chrome Blob Yes 500 MiB None
    Chrome for Android Blob Yes 500 MiB None
    Edge Blob Yes ? None
    IE 10+ Blob Yes 600 MiB None
    Opera 15+ Blob Yes 500 MiB 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) {}

    IE < 10

    It is possible to save text files in IE < 10 without Flash-based polyfills. See ChenWenBrian and koffsyrup's saveTextAs() for more details.

    Safari 6.1+

    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. Using the application/octet-stream MIME type to force downloads can cause issues in Safari.


    saveAs must be run within a user interaction event such as onTouchDown or onClick; setTimeout will prevent saveAs from triggering. Due to restrictions in iOS saveAs opens in a new window instead of downloading, if you want this fixed please tell Apple how this bug is affecting you.


    FileSaver saveAs(Blob data, DOMString filename, optional Boolean disableAutoBOM)

    Pass true for disableAutoBOM if you don't want FileSaver.js to automatically provide Unicode text encoding hints (see: byte order mark).


    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.

    Tracking image


    The FileSaver.js distribution file is compiled with Uglify.js like so:

    uglifyjs FileSaver.js --mangle --comments /@source> FileSaver.min.js

    Please make sure you build a production version before submitting a pull request.

    Bower Installation

    Please see the this repo for a bower-compatible fork of FileSaver.js, available under the package name file-saver.js.


    npm i filesaver.js-npm

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    • leosvelperez