diff --git a/types/cryptr/cryptr-tests.ts b/types/cryptr/cryptr-tests.ts
new file mode 100644
index 0000000000..3c655d7288
--- /dev/null
+++ b/types/cryptr/cryptr-tests.ts
@@ -0,0 +1,10 @@
+import Cryptr = require('cryptr');
+
+// $ExpectType Cryptr
+const cryptr = new Cryptr('myTotallySecretKey');
+
+// $ExpectType string
+const encrypted_string = cryptr.encrypt('bacon');
+
+// $ExpectType string
+cryptr.decrypt(encrypted_string);
diff --git a/types/cryptr/index.d.ts b/types/cryptr/index.d.ts
new file mode 100644
index 0000000000..4aec15c419
--- /dev/null
+++ b/types/cryptr/index.d.ts
@@ -0,0 +1,20 @@
+// Type definitions for cryptr 4.0
+// Project: https://github.com/MauriceButler/cryptr
+// Definitions by: Roman Rogowski <https://github.com/rrogowski>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare class Cryptr {
+	/**
+	 * Cryptr provides a mechanism for aes-256-ctr encryption/decryption.
+	 * @param secret key used for encryption/decryption
+	 */
+	constructor(secret: string);
+
+	/** Encrypt a string. */
+	encrypt(value: string): string;
+
+	/** Decrypt a string. */
+	decrypt(value: string): string;
+}
+
+export = Cryptr;
diff --git a/types/cryptr/tsconfig.json b/types/cryptr/tsconfig.json
new file mode 100644
index 0000000000..2727c48e08
--- /dev/null
+++ b/types/cryptr/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "strictFunctionTypes": true
+    },
+    "files": [
+        "index.d.ts",
+        "cryptr-tests.ts"
+    ]
+}
diff --git a/types/cryptr/tslint.json b/types/cryptr/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/cryptr/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }