diff --git a/README.md b/README.md
index 533a0a4..e305162 100644
--- a/README.md
+++ b/README.md
@@ -12,14 +12,20 @@ npm install base64-img --save
 mocha
 ```
 ## API
-### .base64(filename, callback)
+Note: All methods which take a callback, if omitted, will return a promise
+### .base64(filename[, callback])
 Convert image file to image base64 data
 * {string} ``filename`` required  
 The image path
-* {function} ``callback(err, data)`` required  
+* {function} ``callback(err, data)`` optional  
 Callback with image base64 data
 ```js
 base64Img.base64('path/demo.png', function(err, data) {})
+
+/* promise */
+base64Img.base64('path/demo.png').then(function(data) {
+
+})
 ```
 
 ### .base64Sync(filename)
@@ -28,18 +34,24 @@ The api same as base64, but it's synchronous
 var data = base64Img.base64Sync('path/demo.png');
 ```
 
-### .requestBase64(url, callback)
+### .requestBase64(url[, callback])
 * {string} ``url`` required
-* {function} ``callback(err, res, body)`` required  
+* {function} ``callback(err, res, body)`` optional  
 Callback with http request
 ```js
 var url = 'http://../demo.png';
-base64Img.requestBase64(url, function(err, res, body) {
+base64Img.requestBase64(url, function(err, res, data) {
   
+});
+
+/* promise */
+var url = 'http://../demo.png';
+base64Img.requestBase64(url).then(function({res, data}) {
+
 });
 ```
 
-### .img(data, destpath, name, callback)
+### .img(data, destpath, name[, callback])
 Convert image base64 data to image
 * {string} ``data`` required  
 Image base64 data
@@ -47,9 +59,14 @@ Image base64 data
 Dest path, if the destpath is root, pass empty string
 * {string} ``name`` required  
 The image's filename
-* {function} ``callback(err, filepath)`` required
+* {function} ``callback(err, filepath)`` optional
 ```js
 base64Img.img('data:image/png;base64,...', 'dest', '1', function(err, filepath) {});
+
+/* promise */
+base64Img.img('data:image/png;base64,...', 'dest', '1').then(function(filepath) {
+  
+});
 ```
 
 ### .imgSync(data, destpath, name)
diff --git a/base64-img.js b/base64-img.js
index 10bb7c3..aeff99e 100644
--- a/base64-img.js
+++ b/base64-img.js
@@ -5,7 +5,7 @@ var request = require('ajax-request');
 function base64(filename, data) {
   var extname = path.extname(filename).substr(1);
   extname = extname || 'png';
-  
+
   return 'data:image/' + extname + ';base64,' + data.toString('base64');
 }
 
@@ -28,16 +28,56 @@ function img(data) {
   };
 }
 
+function base64Promise(filename) {
+  return new Promise((resolve, reject) => {
+    fs.readFile(filename, function (err, data) {
+      if (err) reject(err);
+
+      resolve(base64(filename, data));
+    });
+  });
+};
+
+function requestBase64Promise(url) {
+  return new Promise((resolve, reject) => {
+    request({
+      url: url,
+      isBuffer: true
+    }, function (err, res, body) {
+      if (err) return reject(err);
+
+      var data = 'data:' + res.headers['content-type'] + ';base64,' + body.toString('base64');
+      resolve({ res, data });
+    });
+  });
+};
+
+function imgPromise(data, destpath, name) {
+  return new Promise((resolve, reject) => {
+    var result = img(data);
+    var filepath = path.join(destpath, name + result.extname);
+
+    fs.writeFile(filepath, result.base64, { encoding: 'base64' }, function (err) {
+      if (err) return reject(err);
+      resolve(filepath);
+    });
+  });
+};
+
 /**
  * @description
  * Get image file base64 data
  * @example
  * base64Img.base64('path/demo.png', function(err, data) {})
+ * @example
+ * base64Img.base64('path/demo.png').then(function(data) {
+ * 
+ * });
  */
-exports.base64 = function(filename, callback) {
-  if (!callback) callback = util.noop;
+exports.base64 = function (filename, callback) {
+  if (!callback) return base64Promise(filename);
 
-  fs.readFile(filename, function(err, data) {
+  fs.readFile(filename, function (err, data) {
     if (err) return callback(err);
 
     callback(null, base64(filename, data));
@@ -50,7 +90,7 @@ exports.base64 = function(filename, callback) {
  * @example
  * var data = base64Img.base64Sync('path/demo.png');
  */
-exports.base64Sync = function(filename) {
+exports.base64Sync = function (filename) {
   var data = fs.readFileSync(filename);
 
   return base64(filename, data);
@@ -66,8 +106,16 @@ exports.base64Sync = function(filename) {
  * 
  *   }
  * );
+ * @example
+ * request.base64(
+ *   'http://webresource.c-ctrip.com/ResCRMOnline/R5/html5/images/57.png',
+ * ).then(function({res, data}) {
+ * 
+ * });
  */
-exports.requestBase64 = function(url, callback) {
+exports.requestBase64 = function (url, callback) {
+  if (!callback) return requestBase64Promise(url);
+
   request({
     url: url,
     isBuffer: true
@@ -84,12 +132,16 @@ exports.requestBase64 = function(url, callback) {
  * Convert image base64 data to img
  * @example
  * base64Img.img('data:image/png;base64,...', 'dest', '1', function(err, filepath) {});
+ * @example
+ * base64Img.img('data:image/png;base64,...', 'dest', '1').then(function(filepath) {});
  */
-exports.img = function(data, destpath, name, callback) {
+exports.img = function (data, destpath, name, callback) {
+  if (!callback) return imgPromise(data, destpath, name);
+
   var result = img(data);
   var filepath = path.join(destpath, name + result.extname);
 
-  fs.writeFile(filepath, result.base64, { encoding: 'base64' }, function(err) {
+  fs.writeFile(filepath, result.base64, { encoding: 'base64' }, function (err) {
     callback(err, filepath);
   });
 };
@@ -100,7 +152,7 @@ exports.img = function(data, destpath, name, callback) {
  * @example
  * var filepath = base64Img.imgSync('data:image/png;base64,...', 'dest', '1');
  */
-exports.imgSync = function(data, destpath, name) {
+exports.imgSync = function (data, destpath, name) {
   var result = img(data);
   var filepath = path.join(destpath, name + result.extname);
 
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..0efd999
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,559 @@
+{
+  "name": "base64-img",
+  "version": "1.0.3",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "abbrev": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
+      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
+      "dev": true
+    },
+    "ajax-request": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/ajax-request/-/ajax-request-1.2.3.tgz",
+      "integrity": "sha1-mfy+wdbSeS+F+pSVNTMr0U9fN5A=",
+      "requires": {
+        "file-system": "2.2.2",
+        "utils-extend": "1.0.8"
+      }
+    },
+    "argparse": {
+      "version": "0.1.16",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-0.1.16.tgz",
+      "integrity": "sha1-z9AeD7uj1srtBJ+9dY1A9lGW9Xw=",
+      "dev": true,
+      "requires": {
+        "underscore": "1.7.0",
+        "underscore.string": "2.4.0"
+      },
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+          "resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-2.4.0.tgz",
+          "integrity": "sha1-jN2PusTi0uoefi6Al8QvRCKA+Fs=",
+          "dev": true
+        }
+      }
+    },
+    "async": {
+      "version": "0.1.22",
+      "resolved": "https://registry.npmjs.org/async/-/async-0.1.22.tgz",
+      "integrity": "sha1-D8GqoIig4+8Ovi2IMbqw3PiEUGE=",
+      "dev": true
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+      "version": "0.6.6",
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