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    <p>See <a href="http://jsfiddle.net/5SVuA/1/" rel="nofollow noreferrer"><strong>THIS FIDDLE</strong></a>, the important change is that your logic is wrong- you're checking the height and width against the previously uploaded image (blah), you actually need to execute the upload to check the properties- and then determine what action to take.</p> <p>Note that the below/linked example takes <a href="https://stackoverflow.com/questions/12570834/how-to-preview-image-get-file-size-image-height-and-width-before-upload">this answer on SO</a>, edited for your purposes.</p> <p>HTML</p> <pre><code>&lt;input type="file" id="choose" multiple="multiple" /&gt; &lt;br&gt; &lt;div id="uploadPreview"&gt;&lt;/div&gt; </code></pre> <p>JS</p> <pre><code>function readImage(file) { var reader = new FileReader(); var image = new Image(); var maxh = 800; var maxw = 800; reader.readAsDataURL(file); reader.onload = function (_file) { image.src = _file.target.result; // url.createObjectURL(file); image.onload = function () { var w = this.width, h = this.height, t = file.type, // ext only: // file.type.split('/')[1], n = file.name, s = ~~ (file.size / 1024) + 'KB'; if (w &gt; maxw &amp;&amp; h &gt; maxh) { alert("Height is bigger then over max criteria pls select image max height and width =2024X2024"); alert(width); alert(height); } else { $('#uploadPreview').html('&lt;img src="' + this.src + '"&gt; ' + w + 'x' + h + ' ' + s + ' ' + t + ' ' + n + '&lt;br&gt;'); } }; image.onerror = function () { alert('Invalid file type: ' + file.type); }; }; } $("#choose").change(function (e) { if (this.disabled) return alert('File upload not supported!'); var F = this.files; if (F &amp;&amp; F[0]) for (var i = 0; i &lt; F.length; i++) readImage(F[i]); }); </code></pre>
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