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I need some help here.. Im trying to save a canvas image after drawing.. following this example ( http://www.dotnetfunda.com/articles/article1662-saving-html-5-canvas-as-image-on-the-server-using-aspnet.aspx ) $("#btnSave").click(function () { var image = document.getElementById("canvas").toDataURL("image/png"); image = image.replace('data:image/png;base64,', ''); $.ajax({ type: 'POST', url: "../../Home/UploadImage?imageData=" + image, contentType: 'application/json; charset=utf-8', dataType: 'json', success: function (msg) { alert('Image saved successfully !'); } }); }); the controller: public void UploadImage(string imageData) { string fileNameWitPath = path + DateTime.Now.ToString().Replace("/", "-").Replace(" ", "- ").Replace(":", "") + ".png"; using (FileStream fs = new FileStream(fileNameWitPath, FileMode.Create)) { using (BinaryWriter bw = new BinaryWriter(fs)) { byte[] data = Convert.FromBase64String(imageData); bw.Write(data); bw.Close(); } } } But when im trying to convert form base64 the string that is passed like parameter in method, throw an error Invalid length for a character array Base-64.

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