diff --git a/lib/exec.js b/lib/exec.js
index 66537a9..f49dd72 100644
--- a/lib/exec.js
+++ b/lib/exec.js
@@ -15,22 +15,37 @@ module.exports = (function () {
         mimer = require('mimer'),
         uri  = require('./uri'),
         css  = require('./css'),
-        existsSync = fs.existsSync || path.existsSync;
+        existsSync = fs.existsSync || path.existsSync,
+        exists = fs.exists || path.exists;
 
     var DataURI = function (fileName) {
         if (!(this instanceof DataURI)) {
-            if (fileName) {
-                var dUri = new DataURI();
-
-                return dUri.createConfig(fileName);
-            }
-            return new DataURI();
-        }
-
-        if (fileName) {
+            return new DataURI(fileName);
+        } else if (fileName) {
             return this.createConfig(fileName);
         }
     };
+    
+    DataURI.async = function(fileName, callback) {
+        DataURI.asyncURI(fileName, function(err, uri) {
+           if(err) return callback(err);
+           callback(null, uri.content);
+        });  
+    };
+    
+    DataURI.asyncURI = function(fileName, callback) {
+        exists(fileName, function(isExisting) {
+            fs.readFile(fileName, 'base64', function(err, data) {
+                if(err) return callback(err);
+                var uri = new DataURI();
+                uri.fileName = fileName;
+                uri.base64 = data;
+                uri.mimetype = mimer(fileName);
+                uri.content = uri(uri);
+                callback(null, uri);
+            });
+        });
+    }
 
     DataURI.prototype.createConfig = function (fileName) {