You can use Ospry.io - here is a usage example:
<script src="https://code.ospry.io/v1/ospry.js"></script>
<script src="https://code.jquery.com/jquery-3.3.1.js"></script>
<form id="up-form">
<input type="file" multiple />
<button type="submit">Upload image</button>
</form>
<script>
var ospry = new Ospry('YOUR_PUBLIC_KEY');
$('#up-form').submit(function(e) {
e.preventDefault();
ospry.up({
form: this,
imageReady: function(err, metadata, i) {
alert("Find file at: " + metadata.url);
}
});
});
</script>
P.S. - you need to sign up to get your API key.