diff --git a/src/Command/SitemapChecker.php b/src/Command/SitemapChecker.php
index 3875f6f..47e1c53 100644
--- a/src/Command/SitemapChecker.php
+++ b/src/Command/SitemapChecker.php
@@ -204,44 +204,27 @@ protected function execute(InputInterface $input, OutputInterface $output):int
         }
 
         $progressBar->finish();
+        // We don't want to print our next output after the progress bar.
+        $output->writeln('');
 
         $resultFile = $input->getOption('result-file');
 
         if ($resultFile === NULL) {
-          // Write a blank line to print the results correctly.
           $resultRender = new PlainResultRender();
-          $output->writeln('');
           $output->writeln($resultRender->render($results));
         }
-        elseif (is_string($resultFile) && str_contains($resultFile, '.csv')) {
-          $io->info('Writing CSV file.');
-          $resultRender = new CsvResultRender();
-          $renderedResult = $resultRender->render($results);
-          file_put_contents($resultFile, $renderedResult);
-        }
-        elseif (is_string($resultFile) && str_contains($resultFile, '.json')) {
-          $io->info('Writing JSON file.');
-          $resultRender = new JsonResultRender();
-          $renderedResult = $resultRender->render($results);
-          file_put_contents($resultFile, $renderedResult);
-        }
-        elseif (is_string($resultFile) && str_contains($resultFile, '.xml')) {
-          $io->info('Writing XML file.');
-          $resultRender = new XmlResultRender();
-          $renderedResult = $resultRender->render($results);
-          file_put_contents($resultFile, $renderedResult);
-        }
-        elseif (is_string($resultFile) && str_contains($resultFile, '.html')) {
-          $io->info('Writing HTML file.');
-          $resultRender = new HtmlResultRender();
-          $renderedResult = $resultRender->render($results);
-          file_put_contents($resultFile, $renderedResult);
-        }
         else {
-          $io->error('Invalid output format found.');
-          return Command::INVALID;
+            $resultExt = strtolower(pathinfo($resultFile, PATHINFO_EXTENSION));
+            $resultRender = match ($resultExt) {
+              'csv' => new CsvResultRender(),
+              'json' => new JsonResultRender(),
+              'xml' => new XmlResultRender(),
+              'html' => new HtmlResultRender(),
+              default => new PlainResultRender(),
+            };
+            $io->info(sprintf('Writing %s file.', $resultRender->getType()));
+            file_put_contents($resultFile, $resultRender->render($results));
         }
-
         return Command::SUCCESS;
     }
 
diff --git a/src/ResultRender/CsvResultRender.php b/src/ResultRender/CsvResultRender.php
index b536e8d..1bf7bed 100644
--- a/src/ResultRender/CsvResultRender.php
+++ b/src/ResultRender/CsvResultRender.php
@@ -20,5 +20,9 @@ public function render(ResultCollectionInterface $resultCollection): string
     return $string;
   }
 
+  public function getType(): string
+  {
+    return 'CSV';
+  }
 
 }
\ No newline at end of file
diff --git a/src/ResultRender/HtmlResultRender.php b/src/ResultRender/HtmlResultRender.php
index 79e3422..6e52234 100644
--- a/src/ResultRender/HtmlResultRender.php
+++ b/src/ResultRender/HtmlResultRender.php
@@ -36,5 +36,9 @@ public function render(ResultCollectionInterface $resultCollection): string
 EOL;
   }
 
+  public function getType(): string
+  {
+    return 'HTML';
+  }
 
 }
\ No newline at end of file
diff --git a/src/ResultRender/JsonResultRender.php b/src/ResultRender/JsonResultRender.php
index f3b4045..6a4b189 100644
--- a/src/ResultRender/JsonResultRender.php
+++ b/src/ResultRender/JsonResultRender.php
@@ -23,5 +23,9 @@ public function render(ResultCollectionInterface $resultCollection): string
     return json_encode($array, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_NUMERIC_CHECK) ?: '';
   }
 
+  public function getType(): string
+  {
+    return 'JSON';
+  }
 
 }
\ No newline at end of file
diff --git a/src/ResultRender/PlainResultRender.php b/src/ResultRender/PlainResultRender.php
index 331e3ac..b33100f 100644
--- a/src/ResultRender/PlainResultRender.php
+++ b/src/ResultRender/PlainResultRender.php
@@ -15,5 +15,9 @@ public function render(ResultCollectionInterface $resultCollection): string
     return $string;
   }
 
+  public function getType(): string
+  {
+    return 'plain';
+  }
 
 }
\ No newline at end of file
diff --git a/src/ResultRender/ResultRenderInterface.php b/src/ResultRender/ResultRenderInterface.php
index a4d6dfc..c37a5c8 100644
--- a/src/ResultRender/ResultRenderInterface.php
+++ b/src/ResultRender/ResultRenderInterface.php
@@ -6,4 +6,5 @@
 
 interface ResultRenderInterface {
   public function render(ResultCollectionInterface $resultCollection): string;
+  public function getType(): string;
 }
\ No newline at end of file
diff --git a/src/ResultRender/XmlResultRender.php b/src/ResultRender/XmlResultRender.php
index be210b2..d7f0a58 100644
--- a/src/ResultRender/XmlResultRender.php
+++ b/src/ResultRender/XmlResultRender.php
@@ -22,5 +22,9 @@ public function render(ResultCollectionInterface $resultCollection): string
     return $xml->asXML() ?: '';
   }
 
+  public function getType(): string
+  {
+    return 'XML';
+  }
 
 }
\ No newline at end of file
diff --git a/tests/ResultRenderer/CsvResultRendererTest.php b/tests/ResultRenderer/CsvResultRendererTest.php
index 22e5237..69e8378 100644
--- a/tests/ResultRenderer/CsvResultRendererTest.php
+++ b/tests/ResultRenderer/CsvResultRendererTest.php
@@ -13,4 +13,10 @@ public function testCsvRenderPrintsResultCorrectly()
     $this->assertStringContainsString('"https://www.example.com/","Title","200"', $renderedResult);
   }
 
+  public function testCsvRenderReturnsType()
+  {
+    $resultRenderer = new CsvResultRender();
+    $this->assertEquals('CSV', $resultRenderer->getType());
+  }
+
 }
\ No newline at end of file
diff --git a/tests/ResultRenderer/HtmlResultRendererTest.php b/tests/ResultRenderer/HtmlResultRendererTest.php
index 9ea75de..93a6aea 100644
--- a/tests/ResultRenderer/HtmlResultRendererTest.php
+++ b/tests/ResultRenderer/HtmlResultRendererTest.php
@@ -17,4 +17,10 @@ public function testHtmlRenderPrintsResultCorrectly()
     $this->assertStringContainsString('<li><strong>Response Code:</strong> 200</li>', $renderedResult);
   }
 
+  public function testHtmlRenderReturnsType()
+  {
+    $resultRenderer = new HtmlResultRender();
+    $this->assertEquals('HTML', $resultRenderer->getType());
+  }
+
 }
\ No newline at end of file
diff --git a/tests/ResultRenderer/JsonResultRendererTest.php b/tests/ResultRenderer/JsonResultRendererTest.php
index c7c9456..f5b1554 100644
--- a/tests/ResultRenderer/JsonResultRendererTest.php
+++ b/tests/ResultRenderer/JsonResultRendererTest.php
@@ -16,4 +16,10 @@ public function testJsonRenderPrintsResultCorrectly()
     $this->assertStringContainsString('"response_code":200', $renderedResult);
   }
 
+  public function testJsonRenderReturnsType()
+  {
+    $resultRenderer = new JsonResultRender();
+    $this->assertEquals('JSON', $resultRenderer->getType());
+  }
+
 }
\ No newline at end of file
diff --git a/tests/ResultRenderer/PlainResultRendererTest.php b/tests/ResultRenderer/PlainResultRendererTest.php
index a9c48a3..56754bb 100644
--- a/tests/ResultRenderer/PlainResultRendererTest.php
+++ b/tests/ResultRenderer/PlainResultRendererTest.php
@@ -14,4 +14,10 @@ public function testPlainRenderPrintsResultCorrectly()
     $this->assertStringContainsString('https://www.example.com/ Title 200', $renderedResult);
   }
 
+  public function testPlainRenderReturnsType()
+  {
+    $resultRenderer = new PlainResultRender();
+    $this->assertEquals('plain', $resultRenderer->getType());
+  }
+
 }
\ No newline at end of file
diff --git a/tests/ResultRenderer/XmlResultRendererTest.php b/tests/ResultRenderer/XmlResultRendererTest.php
index 48eb62f..8cd3fe5 100644
--- a/tests/ResultRenderer/XmlResultRendererTest.php
+++ b/tests/ResultRenderer/XmlResultRendererTest.php
@@ -16,4 +16,10 @@ public function testXmlRenderPrintsResultCorrectly()
     $this->assertStringContainsString('<response_code>200</response_code>', $renderedResult);
   }
 
+  public function testXmlRenderReturnsType()
+  {
+    $resultRenderer = new XmlResultRender();
+    $this->assertEquals('XML', $resultRenderer->getType());
+  }
+
 }
\ No newline at end of file