My client is offering the user to pick a picture, crop and resize it and then display it (in a `<img>` DOM element).  

If the picture is fine, the user can upload it to the server so it can be saved.

I would like to do the upload thanks to an Ajax request.

I found tons of examples on the internet to upload **the original image** retrieved from the client PC. For instance:

```
$( '#my-form' )
  .submit( function( e ) {
    $.ajax( {
      url: 'http://host.com/action/',
      type: 'POST',
      data: new FormData( this ),
      processData: false,
      contentType: false
    } );
    e.preventDefault();
  } );

```

This works properly if I decide to upload the picture retrieved through the form input.

In my case I want to **upload the modified picture** (saved in a `<img>` element) instead of the original one.  

This picture is stored as a base64 picture (For information: I used the croppie.js library to generate the image).

I don't know how to upload this picture with Ajax.

I tried to upload it as a regular parameter but on the server side the img is an empty string:

```
var url = 'http://host.com/action/';
var data = {};
data.img = $('img#generated-image').attr('src');

$.ajax({url: url, type: "POST", data: data})
  .done(function(e){
    // Do something
  });
// RESULTS in a empty data.img on the server side.

```

My problem being the server having an empty string when retrieving the "img" parameter. I suspect the image is maybe too big to be passed to the server or some other issues that I don't understand... .

So I'm wondering what is the **proper way to send a base64 image to the server** using an Ajax request **WITHOUT** using a form.

Thanks for your help.

**EDIT**

Seems to be an xmlHTTP POST parameter size issue. I tried to reduce the number of characters of the string representation of the image and the server is now able to retrieve it.

EDIT2

post\_max\_size is set to 8M in the php.ini file wheras the picture size is only 24K. So the problem is not there.  

I'm using PHP with the Symfony2 framework.  

Maybe a limitation from Symfony2.