diff --git a/CHANGES.md b/CHANGES.md
index c0c95e0..75d5cc8 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,8 @@
+## 1.6.0
+* Support to run the unittests on newer versions of PHP (5.5 +)
+* Add API methods for converting/transcoding and transformation
+* Add helper function for returning the compressed file extension
+
 ## 1.5.2
 * Fail early if version of curl/openssl is too old.
 
diff --git a/lib/Tinify.php b/lib/Tinify.php
index 8d44685..f6f9b0c 100644
--- a/lib/Tinify.php
+++ b/lib/Tinify.php
@@ -2,7 +2,7 @@
 
 namespace Tinify;
 
-const VERSION = "1.5.2";
+const VERSION = "1.6.0";
 
 class Tinify {
     private static $key = NULL;
diff --git a/lib/Tinify/ResultMeta.php b/lib/Tinify/ResultMeta.php
index 337a48f..27aba0e 100644
--- a/lib/Tinify/ResultMeta.php
+++ b/lib/Tinify/ResultMeta.php
@@ -20,4 +20,12 @@ public function height() {
     public function location() {
         return isset($this->meta["location"]) ? $this->meta["location"] : null;
     }
+
+    public function extension() {
+        if (isset($this->meta["content-type"])) {
+            $parts = explode("/", $this->meta["content-type"]);
+            return end($parts);
+        }
+        return null;
+    }
 }
diff --git a/lib/Tinify/Source.php b/lib/Tinify/Source.php
index 01c013f..304040a 100644
--- a/lib/Tinify/Source.php
+++ b/lib/Tinify/Source.php
@@ -42,6 +42,16 @@ public function store($options) {
         return new Result($response->headers, $response->body);
     }
 
+    public function convert($options) {
+        $commands = array_merge($this->commands, array("convert" => $options));
+        return new self($this->url, $commands);
+    }
+
+    public function transform($options) {
+        $commands = array_merge($this->commands, array("transform" => $options));
+        return new self($this->url, $commands);
+    }
+
     public function result() {
         $response = Tinify::getClient()->request("get", $this->url, $this->commands);
         return new Result($response->headers, $response->body);
diff --git a/test/TinifyResultTest.php b/test/TinifyResultTest.php
index 81687c5..94e3406 100644
--- a/test/TinifyResultTest.php
+++ b/test/TinifyResultTest.php
@@ -32,4 +32,14 @@ public function testWithMetaAndDataToBufferShouldReturnImageData() {
         $result = new Tinify\Result(array(), "image data");
         $this->assertSame("image data", $result->toBuffer());
     }
+
+    public function testWithMetadataReturnsExtension() {
+        $result = new Tinify\Result(array("content-type" => "image/png"), "image data");
+        $this->assertSame($result->extension(), "png");
+    }
+
+    public function testWithoutMetadataReturnsExtensionAsNull() {
+        $result = new Tinify\ResultMeta(array(), "image data");
+        $this->assertSame($result->extension(), null);
+    }
 }
diff --git a/test/TinifySourceTest.php b/test/TinifySourceTest.php
index 67c8e07..80c5fd8 100644
--- a/test/TinifySourceTest.php
+++ b/test/TinifySourceTest.php
@@ -36,7 +36,7 @@ public function testWithInvalidApiKeyFromUrlShouldThrowAccountException() {
         Tinify\Source::fromUrl("http://example.com/test.jpg");
     }
 
-    public function testWithValidApiKeyFromFileShouldReturnSource() {
+    public function testFromFileShouldReturnSource() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
@@ -46,7 +46,7 @@ public function testWithValidApiKeyFromFileShouldReturnSource() {
         $this->assertInstanceOf("Tinify\Source", Tinify\Source::fromFile(DUMMY_FILE_LOCATION));
     }
 
-    public function testWithValidApiKeyFromFileShouldReturnSourceWithData() {
+    public function testFromFileShouldReturnSourceWithData() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
@@ -60,7 +60,7 @@ public function testWithValidApiKeyFromFileShouldReturnSourceWithData() {
         $this->assertSame("compressed file", Tinify\Source::fromFile(DUMMY_FILE_LOCATION)->toBuffer());
     }
 
-    public function testWithValidApiKeyFromBufferShouldReturnSource() {
+    public function testFromBufferShouldReturnSource() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
@@ -70,7 +70,7 @@ public function testWithValidApiKeyFromBufferShouldReturnSource() {
         $this->assertInstanceOf("Tinify\Source", Tinify\Source::fromBuffer("png file"));
     }
 
-    public function testWithValidApiKeyFromBufferShouldReturnSourceWithData() {
+    public function testFromBufferShouldReturnSourceWithData() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
@@ -84,17 +84,17 @@ public function testWithValidApiKeyFromBufferShouldReturnSourceWithData() {
         $this->assertSame("compressed file", Tinify\Source::fromBuffer("png file")->toBuffer());
     }
 
-    public function testWithValidApiKeyFromUrlShouldReturnSource() {
+    public function testFromUrlShouldReturnSource() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
             "status" => 201, "headers" => array("Location" => "https://api.tinify.com/some/location")
         ));
 
-        $this->assertInstanceOf("Tinify\Source", Tinify\Source::fromUrl("http://example.com/testWithValidApiKey.jpg"));
+        $this->assertInstanceOf("Tinify\Source", Tinify\Source::fromUrl("http://example.com/test.jpg"));
     }
 
-    public function testWithValidApiKeyFromUrlShouldReturnSourceWithData() {
+    public function testFromUrlShouldReturnSourceWithData() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
@@ -105,10 +105,10 @@ public function testWithValidApiKeyFromUrlShouldReturnSourceWithData() {
             "status" => 200, "body" => "compressed file"
         ));
 
-        $this->assertSame("compressed file", Tinify\Source::fromUrl("http://example.com/testWithValidApiKey.jpg")->toBuffer());
+        $this->assertSame("compressed file", Tinify\Source::fromUrl("http://example.com/test.jpg")->toBuffer());
     }
 
-    public function testWithValidApiKeyFromUrlShouldThrowExceptionIfRequestIsNotOK() {
+    public function testFromUrlShouldThrowExceptionIfRequestIsNotOK() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
@@ -119,7 +119,7 @@ public function testWithValidApiKeyFromUrlShouldThrowExceptionIfRequestIsNotOK()
         Tinify\Source::fromUrl("file://wrong");
     }
 
-    public function testWithValidApiKeyResultShouldReturnResult() {
+    public function testResultShouldReturnResult() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
@@ -134,7 +134,7 @@ public function testWithValidApiKeyResultShouldReturnResult() {
         $this->assertInstanceOf("Tinify\Result", Tinify\Source::fromBuffer("png file")->result());
     }
 
-    public function testWithValidApiKeyPreserveShouldReturnSource() {
+    public function testPreserveShouldReturnSource() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
@@ -149,7 +149,7 @@ public function testWithValidApiKeyPreserveShouldReturnSource() {
         $this->assertSame("png file", CurlMock::last(CURLOPT_POSTFIELDS));
     }
 
-    public function testWithValidApiKeyPreserveShouldReturnSourceWithData() {
+    public function testPreserveShouldReturnSourceWithData() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
@@ -164,7 +164,7 @@ public function testWithValidApiKeyPreserveShouldReturnSourceWithData() {
         $this->assertSame("{\"preserve\":[\"copyright\",\"location\"]}", CurlMock::last(CURLOPT_POSTFIELDS));
     }
 
-    public function testWithValidApiKeyPreserveShouldReturnSourceWithDataForArray() {
+    public function testPreserveShouldReturnSourceWithDataForArray() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
@@ -179,7 +179,7 @@ public function testWithValidApiKeyPreserveShouldReturnSourceWithDataForArray()
         $this->assertSame("{\"preserve\":[\"copyright\",\"location\"]}", CurlMock::last(CURLOPT_POSTFIELDS));
     }
 
-    public function testWithValidApiKeyPreserveShouldIncludeOtherOptionsIfSet() {
+    public function testPreserveShouldIncludeOtherOptionsIfSet() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
@@ -196,7 +196,7 @@ public function testWithValidApiKeyPreserveShouldIncludeOtherOptionsIfSet() {
         $this->assertSame("{\"resize\":{\"width\":400},\"preserve\":[\"copyright\",\"location\"]}", CurlMock::last(CURLOPT_POSTFIELDS));
     }
 
-    public function testWithValidApiKeyResizeShouldReturnSource() {
+    public function testResizeShouldReturnSource() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
@@ -211,7 +211,7 @@ public function testWithValidApiKeyResizeShouldReturnSource() {
         $this->assertSame("png file", CurlMock::last(CURLOPT_POSTFIELDS));
     }
 
-    public function testWithValidApiKeyResizeShouldReturnSourceWithData() {
+    public function testResizeShouldReturnSourceWithData() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
@@ -226,7 +226,67 @@ public function testWithValidApiKeyResizeShouldReturnSourceWithData() {
         $this->assertSame("{\"resize\":{\"width\":400}}", CurlMock::last(CURLOPT_POSTFIELDS));
     }
 
-    public function testWithValidApiKeyStoreShouldReturnResultMeta() {
+    public function testConvertShouldReturnSource() {
+        Tinify\setKey("valid");
+
+        CurlMock::register("https://api.tinify.com/shrink", array(
+            "status" => 201, "headers" => array("Location" => "https://api.tinify.com/some/location")
+        ));
+
+        CurlMock::register("https://api.tinify.com/some/location", array(
+            "status" => 200, "body" => "Convertd file"
+        ));
+
+        $this->assertInstanceOf("Tinify\Source", Tinify\Source::fromBuffer("png file")->Convert(array("type" =>"image/webp")));
+        $this->assertSame("png file", CurlMock::last(CURLOPT_POSTFIELDS));
+    }
+
+    public function testConvertShouldReturnSourceWithData() {
+        Tinify\setKey("valid");
+
+        CurlMock::register("https://api.tinify.com/shrink", array(
+            "status" => 201, "headers" => array("Location" => "https://api.tinify.com/some/location")
+        ));
+
+        CurlMock::register("https://api.tinify.com/some/location", array(
+            "status" => 200, "body" => "Convertd file"
+        ));
+
+        $this->assertSame("Convertd file", Tinify\Source::fromBuffer("png file")->convert(array("type" => "image/webp"))->toBuffer());
+        $this->assertSame("{\"convert\":{\"type\":\"image\/webp\"}}", CurlMock::last(CURLOPT_POSTFIELDS));
+    }
+
+    public function testTransformShouldReturnSource() {
+        Tinify\setKey("valid");
+
+        CurlMock::register("https://api.tinify.com/shrink", array(
+            "status" => 201, "headers" => array("Location" => "https://api.tinify.com/some/location")
+        ));
+
+        CurlMock::register("https://api.tinify.com/some/location", array(
+            "status" => 200, "body" => "transformed file"
+        ));
+
+        $this->assertInstanceOf("Tinify\Source", Tinify\Source::fromBuffer("png file")->transform(array("background" => "black")));
+        $this->assertSame("png file", CurlMock::last(CURLOPT_POSTFIELDS));
+    }
+
+    public function testTransformShouldReturnSourceWithData() {
+        Tinify\setKey("valid");
+
+        CurlMock::register("https://api.tinify.com/shrink", array(
+            "status" => 201, "headers" => array("Location" => "https://api.tinify.com/some/location")
+        ));
+
+        CurlMock::register("https://api.tinify.com/some/location", array(
+            "status" => 200, "body" => "transformd file"
+        ));
+
+        $this->assertSame("transformd file", Tinify\Source::fromBuffer("png file")->transform(array("background" => "black"))->toBuffer());
+        $this->assertSame("{\"transform\":{\"background\":\"black\"}}", CurlMock::last(CURLOPT_POSTFIELDS));
+    }
+
+    public function testStoreShouldReturnResultMeta() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
@@ -243,7 +303,7 @@ public function testWithValidApiKeyStoreShouldReturnResultMeta() {
         $this->assertSame("{\"store\":{\"service\":\"s3\",\"aws_secret_access_key\":\"abcde\"}}", CurlMock::last(CURLOPT_POSTFIELDS));
     }
 
-    public function testWithValidApiKeyStoreShouldReturnResultMetaWithLocation() {
+    public function testStoreShouldReturnResultMetaWithLocation() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
@@ -263,7 +323,7 @@ public function testWithValidApiKeyStoreShouldReturnResultMetaWithLocation() {
         $this->assertSame("{\"store\":{\"service\":\"s3\"}}", CurlMock::last(CURLOPT_POSTFIELDS));
     }
 
-    public function testWithValidApiKeyStoreShouldIncludeOtherOptionsIfSet() {
+    public function testStoreShouldIncludeOtherOptionsIfSet() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
@@ -280,7 +340,7 @@ public function testWithValidApiKeyStoreShouldIncludeOtherOptionsIfSet() {
         $this->assertSame("{\"resize\":{\"width\":300},\"store\":{\"service\":\"s3\",\"aws_secret_access_key\":\"abcde\"}}", CurlMock::last(CURLOPT_POSTFIELDS));
     }
 
-    public function testWithValidApiKeyToBufferShouldReturnImageData() {
+    public function testToBufferShouldReturnImageData() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
@@ -293,7 +353,7 @@ public function testWithValidApiKeyToBufferShouldReturnImageData() {
         $this->assertSame("compressed file", Tinify\Source::fromBuffer("png file")->toBuffer());
     }
 
-    public function testWithValidApiKeyToFileShouldStoreImageData() {
+    public function testToFileShouldStoreImageData() {
         Tinify\setKey("valid");
 
         CurlMock::register("https://api.tinify.com/shrink", array(
diff --git a/test/integration.php b/test/integration.php
index bf780bd..32226ac 100644
--- a/test/integration.php
+++ b/test/integration.php
@@ -77,4 +77,15 @@ public function testShouldPreserveMetadata() {
         $this->assertStringContainsString("\0\0\0\x89", $contents);
         $this->assertStringContainsString("Copyright Voormedia", $contents);
     }
+
+    public function testShouldConvert() {
+        $path = tempnam(sys_get_temp_dir(), "tinify-php");
+        self::$optimized->convert(array("type" => ["image/webp"]))->toFile($path);
+
+        $size = filesize($path);
+        $contents = fread(fopen($path, "rb"), $size);
+
+        $this->assertEquals(substr($contents, 0, 4), "RIFF");
+        $this->assertEquals(substr($contents, 8, 4), "WEBP");
+    }
 }