diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 01b5025d20..073ff08a9c 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -195,6 +195,7 @@ All definitions files include a header with the author and editors, so at some p
 * [localForage](https://github.com/mozilla/localForage) (by [david pichsenmeister](https://github.com/3x14159265))
 * [Lodash](http://lodash.com/) (by [Brian Zengel](https://github.com/bczengel))
 * [Logg](https://github.com/dpup/node-logg) (by [Bret Little](https://github.com/blittle))
+* [lz-string](https://github.com/pieroxy/lz-string) (by [Roman Nikitin](https://github.com/M0ns1gn0r))
 * [Marked](https://github.com/chjj/marked) (by [William Orr](https://github.com/worr))
 * [mCustomScrollbar](https://github.com/malihu/malihu-custom-scrollbar-plugin) (by [Sarah Williams](https://github.com/flurg))
 * [Meteor](https://www.meteor.com) (by [Dave Allen](https://github.com/fullflavedave))
diff --git a/lz-string/lz-string-tests.ts b/lz-string/lz-string-tests.ts
new file mode 100644
index 0000000000..48d4616458
--- /dev/null
+++ b/lz-string/lz-string-tests.ts
@@ -0,0 +1,12 @@
+/// <reference path="lz-string.d.ts" />
+
+var input = "Someting to compress";
+var encoded: string;
+var decoded: string;
+
+encoded = LZString.compress(input);
+decoded = LZString.decompress(encoded);
+encoded = LZString.compressToUTF16(input);
+decoded = LZString.decompressFromUTF16(encoded);
+encoded = LZString.compressToBase64(input);
+decoded = LZString.decompressFromBase64(encoded);
\ No newline at end of file
diff --git a/lz-string/lz-string.d.ts b/lz-string/lz-string.d.ts
new file mode 100644
index 0000000000..60c1129331
--- /dev/null
+++ b/lz-string/lz-string.d.ts
@@ -0,0 +1,61 @@
+// Type definitions for lz-string v1.3.3
+// Project: https://github.com/pieroxy/lz-string
+// Definitions by: Roman Nikitin <https://github.com/M0ns1gn0r>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare var LZString: LZString.LZStringStatic;
+
+declare module LZString {
+    /**
+    * LZ-based compression algorithm for JavaScript.
+    */
+    interface LZStringStatic {
+        /**
+        * Compresses input string producing an instance of an "invalid" UTF-16 string. 
+        * Such string could be stored in localStorage only on webkit
+        * browsers (tested on Android, Chrome, Safari).
+        *
+        * @param uncompressed A string which should be compressed.
+        */
+        compress(uncompressed: string): string;
+
+        /**
+        * Decompresses "invalid" input string created by the method compress(). 
+        *
+        * @param compressed A string obtained from a call to compress().
+        */
+        decompress(compressed: string): string;
+
+        /**
+        * Compresses input string producing an instance of a "valid" UTF-16 string, 
+        * in the sense that all browsers can store them safely.
+        *
+        * @param uncompressed A string which should be compressed.
+        */
+        compressToUTF16(uncompressed: string): string;
+
+        /**
+        * Decompresses "valid" input string created by the method compressToUTF16(). 
+        *
+        * @param compressed A string obtained from a call to compressToUTF16().
+        */
+        decompressFromUTF16(compressed: string): string;
+
+        /**
+        * Compresses input string producing an instance of a ASCII UTF-16 string,
+        * which represents the original string encoded in Base64. 
+        * The result can be safely transported outside the browser with a 
+        * guarantee that none of the characters produced need to be URL-encoded. 
+        *
+        * @param uncompressed A string which should be compressed.
+        */
+        compressToBase64(uncompressed: string): string;
+
+        /**
+        * Decompresses ASCII UTF-16 input string created by the method compressToBase64(). 
+        *
+        * @param compressed A string obtained from a call to compressToBase64().
+        */
+        decompressFromBase64(compressed: string): string;
+    }
+}
\ No newline at end of file