Multiple file upload plugin with progress-bar, drag-and-drop.
Pull request Compare This branch is 3207 commits behind FineUploader:master.
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Failed to load latest commit information.

Fine Uploader 2.2-SNAPSHOT (planned release date of October 27)

Originally developed/designed by Andrew Valums.
Currently maintained by Ray Nicholus.

If you have found Fine Uploader useful, please consider donating to support continued maintenance and evolution of this library.


October 11, 2012 - Interested in short status/issue updates? Follow Fine Uploader on Twitter! Also, check out the 3.0 branch from time to time if you are interested in the progress.

Table of Contents


Welcome! This project attempts to achieve a user-friendly file-uploading experience over the web. It's built as a Javascript plugin for developers looking to incorporate file-uploading into their website.

This plugin uses an XMLHttpRequest (AJAX) for uploading multiple files with a progress-bar in FF3.6+, Safari4+, Chrome and falls back to hidden-iframe-based upload in other browsers (namely IE), providing good user experience everywhere.

It does not use Flash, jQuery, or any external libraries.

Take a look at the new evolving Demo page.

Interested in short status/issue updates? Follow Fine Uploader on Twitter!

Questions? Comments? Problems? Post in the forums.

Looking for the comment thread from the website? It is still available, but please use the forum instead.


You can download released versions, or, if you are more daring, use the snapshot version on the master branch.

Upgrading from Fine Uploader 2.0

You can see all bugs and features tackled in the 2.1 release here. If you are only interested in a summary, here are some of the more notable changes:

  • Added option to allow all valid files to upload, skipping only invalid files
  • Added gradually filling progress bar (for browsers that support XHR upload/file API)
  • The onError callback is now called whenever any error occurs, either with the upload or file submission
  • An error JSON property in the response is used to determine the specific failure reason, reason property no longer supported
  • Ability to force all requests to use multipart encoding is now a bit more straightforward. Added a forceMultipart option.
  • Added ability to determine if dropzones are hidden or not via the hideDropzones options
  • Added ability to hide default dropzone via the disableDefaultDropzone option
  • Option to display dynamic custom error text next to each failed upload. See the failedUploadTextDisplay option documentation for more details.
Bug Fixes

Please see the list of issues here.


  • Multiple file select, progress-bar in FF, Chrome, Safari
  • Drag-and-drop file select in FF, Chrome
  • Uploads are cancelable
  • No external dependencies
  • Doesn't use Flash
  • Fully working with HTTPS
  • Keyboard support in FF, Chrome, Safari
  • Tested in IE7+ (not IE10 yet), Firefox, Safari (OS X), and Chrome. Safari for Windows is not supported, nor is IE6 or earlier.
  • Ability to upload files as soon as they are selected, or "queue" them for uploading at user's request later
  • Display specific error messages from server on upload failure (hover over failed upload item)


This plugin is open sourced under MIT license, GNU GPL 2 or later and GNU LGPL 2 or later. Please see the license.txt file for details.

Getting started

The fileuploader.js contains two classes that are meant to be used directly. If you need a complete upload widget (from demo) to quickly drop into your current design, use qq.FileUploader.

If you want to customize uploader, by using a different looking file list or change the behaviour or functionality use qq.FileUploaderBasic.

The difference between them is that qq.FileUploader provides a list of files, drag-and-drop, but qq.FileUploaderBasic only creates button and handles validation. Basic uploader is easier extendable, and doesn't limit possible customization.

qq.FileUploader extends qq.FileUploaderBasic, so that all the options present in the basic uploader also exist in the full widget.

qq.FileUploader - Setting up full upload widget

Include fileuploader.js and fileuploader.css into your page. Create container element.

<div id="file-uploader">
    <p>Please enable JavaScript to use file uploader.</p>
    <!-- or put a simple form for upload here -->

Initialize uploader when the DOM is ready. Change the action option. For example ../server/php.php for the default folder structure. In the server folder you will find examples for different platforms. If you can't find the one you need, check the readme.txt in the same folder.

var uploader = new qq.FileUploader({
    // pass the dom node (ex. $(selector)[0] for jQuery users)
    element: document.getElementById('file-uploader'),
    // path to server-side upload script
    action: '/server/upload'

Options of both FileUploader & FileUploaderBasic

Name Type Default Note
debug boolean false If enabled, this will result in log messages (such as server response) being written to the javascript console. If your browser does not support the [window.console object](, the value of this option is irrelevant.
action string (path) /server/upload The is the endpoint used by both the form and ajax uploader. In the case of the form uploader, it is part of the form's action attribute value along with all parameters. In the case of the ajax uplaoder, it is makes up part of the URL of the XHR request (again, along with the parameters).
params object {} These parameters are sent with the request to the endpoint specified in the action option.
customHeaders object {} Additional headers sent along with the XHR POST request. Note that is option is only relevant to the ajax/XHR uploader.
button element null Specify an element to use as the "select files" button. Note that this may NOT be a <button>, otherwise it will not work in Internet Explorer. Please see issue #33 for details.
multiple boolean true Set to false puts the uploader into what is best described as 'single-file upload mode'. See the [demo]( for an example.
maxConnections integer 3 Maximum allowable concurrent uploads.
disableCancelForFormUploads boolean false If true, the cancel link does not appear next to files when the form uploader is used. This may be desired since it may not be possible to interrupt a form-based upload in some cases.
autoUpload boolean true Set to false if you want to be able to begin uploading selected/queued files later, by calling uploadStoredFiles().
allowedExtensions array of strings [] This may be helpful if you want to restrict uploaded files to specific file types. Note that this validation option is only enforced by examining the extension of uploaded file names. For a more complete verification of the file type, you should use, for example, magic byte file identification on the server side and return {"success": false} in the response if the file type is not on your whitelist.
acceptFiles comma-separated strings null This option is used solely by the file selection dialog. If you'd like to restict valid file types that appear in the selection dialog, you can do this here by listing valid content type specifiers. See the [documentation on the accept attribute of the input element]( for more information.
sizeLimit integer 0 (no limit) Maximum allowable size, in bytes, for a file.
minSizeLimit integer 0 (no limit) Minimum allowable size, in bytes, for a file.
stopOnFirstInvalidFile boolean true If true, when submitting multiple files, once a file is determined to be invalid, the upload process will terminate. If false, all valid files will be uploaded. Note: One downside to a false value can be seen if the default showMessage implementation is not overriden. In this case, an alert dialog will appear for each invalid file in the batch, and the upload process will not continue until the dialog is dismissed. If this is bothersome, simply override showMessage with a desirable implementation. 3.0 will likely have a showMessage default implementation that does not use the alert function.
inputName string qqfile This usually only useful with the ajax uploader, which sends the name of the file as a parameter, using a key name equal to the value of this options. In the case of the form uploader, this is simply the value of the name attribute of the file's associated input element.
forceMultipart boolean false While form-based uploads will always be multipart requests, this forces XHR uploads to send files using multipart requests as well.

Options of FileUploader

Name Type Default Note
element element null Container for the default drop zone (if supported by browser) and files list. Required
listElement element null Container for the file list. If null, the list defined in the template will be used.
uploadButtonText string Upload a file Label for the file selector button
cancelButtonText string cancel The cancel button text (which is more of a link than a button).
failUploadText string Upload failed Text that appears next to a failed file item
extraDropzones array of elements [] Useful if you'd like to to designate additional dropozones for file input. Of course, this is not relevant if the form uploader is used.
hideDropzones boolean true Useful if you do not want all dropzone elements to be hidden. It is expected that some CSS would accompany setting this option to false. You may set this to false if you want to wrap some visible elements, such as the listElement, in a drop zone.
disableDefaultDropzone boolean false Set this to true if you are contributing your own drop zone(s) and do not want to use the default one.
failedUploadTextDisplay object {mode: 'default',
maxChars: 50,
responseProperty: 'error',
enableTooltip: true}
This object contains various properties used to control the display of error responses from the server for each file. The styling of the error text is controlled by the fail class.

mode: Valid values are "default" (display the text defined in failUploadText next to each failed file), "none" (don't display any text next to a failed file), and "custom" (display error response text from the server next to the failed file).

maxChars: The maximum amount of character of text to display next to the file. After the limit has been reached, "..." will terminate the string. This is ignored unless mode is "custom".

responseProperty: The property from the server response containing the error text to display next to the failed file. This is ignored unless mode is "custom".

enableTooltip:: If set to true, a tooltip will display the full contents of the error message when the mouse pointer hovers over the failed file. Note that this currently uses the title attribute of the failed file element, but there is an issue to improve this (see #355 for details).

Styling FileUploader

The template option contains default elements with default classes that make up the uploader as a whole in the DOM. For example, the first default element in template is a div with a class of qq-uploader. This is the parent element of the uploader. The default drop area, button, and file list elements are also, by default, contained in this option. You can use this option to add additional elements, modify default template elements, etc.

There is also a fileTemplate option which contains default elements that make up one file item in the file list.

Finally, a classes option allows you to change the default class names for these elements. Be sure the values in classes match the class names used in the corresponding template elements (where appropriate).

Callbacks (FileUploader & FileUploaderBasic)

  • onSubmit(String id, String fileName) - called when the file is submitted to the uploader portion of the code. Note that this does not mean the file upload will begin at this point. Return false to prevent submission to the uploader.
  • onComplete(String id, String fileName, Object responseJSON) - called when the file upload has finished.
  • onCancel(String id, String fileName) - called when the file upload has been cancelled.
  • onUpload(String id, String fileName) - called just before the file upload begins
  • onProgress(String id, String fileName, int uploadedBytes, int totalBytes) - called during the upload, as it progresses. Only used by the XHR/ajax uploader.
  • onError(String id, String fileName, String errorReason) - called whenever an exceptional condition occurs (during an upload, file selection, etc).

Changing alert/messages to something more user friendly

You may want to change the default alert implementation and messages as you see fit. This is possible by overriding the showMessage function option, as well as the messages properties in FileUploaderBasic and the extraMessages properties in FileUploader. The default showMessage function simply invokes alert with the message text. One instance in which t his is used is when the user attempts to select an invalid file for upload. There are general message types with default text that can be overriden as well.

Instance methods

  • setParams(Object newParams) - Set the parameters sent along with the request after initializing the uploader. It can be nicely used in onSubmit callback.
  • uploadStoredFiles() - If !autoUpload, this will begin uploading all queued files.
  • clearStoredFiles() - Clears the internal list of stored files. Only applicable when autoUpload is set to false.
  • getInProgress() - Returns the number of files that are either currently uploading or files waiting in line for upload.

Internet Explorer Limitations

IE continues to lag far behind all other browsers in terms of features. IE10 is supposed to, finally, start to compete with existing modern browsers. For those of you with customers suffering with IE9 and older, here are some of the limitations you may want to be aware of when using Fine Uploader:

Limitation Why? *Supported/Fixed in IE10?
Can't parse JSON response if response code is not 200 If the response code is not 200, and the size of the response is less than 512, or, apparently, sometimes, less than 256 bytes, IE replaces the response with a "friendly" error message. If you insist on returning responses with a status code other than 200, you can work around this by instructing IE users to uncheck the "show friendly HTTP error messages" setting. No
No progress indicator Lack of blob/File API support Yes
Content-Size header field value does not match the actual file size This isn't technically an IE issue, but I'm going to call it one since we are forced to use multipart request in IE. The content-size for multipart data requests does not refer only to the file. Rather, it refers to the the total size of all sections in the request. N/A
Size restriction options are not enforced This is due to the lack of support for the File API. Without it, we have no way to determine the size of each selected file. Yes
Can't drag & drop files Lack of File API support Yes
Can't select multiple files in the file selection dialog The <input> element does not support the multiple attribute Early versions still lacked this support, but I've read that the final version does support this attribute
Only mulipart form request may be used to send files, via form submission Lack of File API support Yes
No logging IE8 and older only: console.log is not implemented Yes
Cancelling an upload has no effect Not really an IE problem, but since we are forced to upload files via form submission, I thought I'd include it. There may be a way to make this work, but I haven't spent time playing around with the available options yet. In the meantime, you should probably set the disableCancelForFormUploads option to true. If I can't find a way to properly allow cancel to work when using the form uploader, I'll probably remove the cancel link when the form uploader is in use. Yes
Can't use a <button> as the element when setting the button option. The button receives the click event, instead of the child <input> element that ultimately triggers the file dialog Not sure
Any response content-type other than "text/plain" causes issues when trying to parse the JSON response IE does strange things with the response when the content-type is, for example, "application/json" or "text/html". The latter is only a problem if you return HTML in your JSON response. Not sure
Can't determine response code Not really an IE problem, but since we are forced to upload files via form submission, I thought I'd include it. This is really a side-effect of using a form submission to upload files. Yes
Can't trigger the file selection dialog via javascript IE strictly forbids this. It will allow you to launch the dialog, but will throw a security exception once the form is also submitted via javascript. Not sure



If you can't get the uploader to work, please try the following steps before asking for help.

If the upload doesn't complete, saying "failed":

  • Set the debug option of the FileUploader to true.
  • Open the page where you have a FileUploader.
  • Open developer console in your browser.
  • Try to upload the file. You should see a server response.

It should be {"success":true} for completed requests. If it's not, then you have a problem with your server-side script.

Issue Tracker

Have a bug or feature request? Please create an issue here on GitHub that conforms with necolas's guidelines.


We would love developers to contribute any improvements and bugfixes they produce. See How do I contribute to other's code in GitHub?.

Also, please see issues tagged as "pull request needed". I could use some help on those issues, in particular.

Thanks to everybody who contributed, either by sending bug reports or donating. The project wouldn't be possible without all this generous help. Thank you!

If you have found Fine Uploader useful, please consider donating to support continued maintenance and evolution of this library.