I would like to know, if is it possible to use multipart upload to S3 via a web browser (low-level API)?
If that is the case are there any demo web apps with source code or tutorials?
Thanks in advance
References http://docs.amazonwebservices.com/AmazonS3/latest/dev/HLTrackProgressMPUJava.html
The question appears to be about multi-part uploads from a browser, not single-part uploads.
Yes, you can do single-part uploads from a web browser using HTTP POST.
No, you cannot do a multi-part upload via a standard web browser, although such a thing might be possible using Flash/Silverlight. This will, of course, eliminate most mobile devices as well as any desktop users who have purposefully uninstalled these plugins (like me!).
From your question, it doesn't seem like you're looking for a solution in a specific language.
Anyway, there's a page on the official s3 docs that shows the browser-based uploads feature. It might help to check it out.
It certainly is possible, look at http://sente.cc/upload_to_s3.html for a working example which uploads directly to S3 from the browser.
Also see https://stackoverflow.com/a/6912340/217652
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<h3>refresh the page after you've submitted to see your new image</h3>
<div style="width:300px">
<form action="http://s3.amazonaws.com/dev.sente" method="post" enctype="multipart/form-data">
<fieldset>
<input type="hidden" name="acl" value="public-read" /> <br />
<i>name of key:</i><input type="text" name="key" readonly="true" value="image.jpg" /> <br />
<input name="file" type="file" /> <br />
<input name="submit" value="Upload" type="submit" />
</fieldset>
</form>
</div>
<br />
<a href="http://s3.amazonaws.com/dev.sente/image.jpg">http://s3.amazonaws.com/dev.sente/image.jpg</a><br />
<a href="http://s3.amazonaws.com/dev.sente/image.jpg"><img src="http://s3.amazonaws.com/dev.sente/image.jpg" /></a>
</a>
</body>
</html>