Get width height of remote image from url

Get image size with jQuery

function getMeta(url) {
    $("<img/>",{
        load: function() {
            alert( this.width +" "+ this.height );
        },
        src: url
    });
}

Get image size with JavaScript

function getMeta(url) {   
    var img = new Image();
    img.onload = function() {
        alert( this.width +" "+ this.height );
    };
    img.src = url;
}

Get image size with JavaScript (modern browsers, IE9+ )

function getMeta(url){   
    const img = new Image();
    img.addEventListener("load", function() {
        alert( this.naturalWidth +' '+ this.naturalHeight );
    });
    img.src = url;
}

Use like: getMeta( "http://example.com/img.jpg" );

https://developer.mozilla.org/en/docs/Web/API/HTMLImageElement