diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -1652,6 +1652,8 @@
     'PHUIInfoPanelExample' => 'applications/uiexample/examples/PHUIInfoPanelExample.php',
     'PHUIInfoPanelView' => 'view/phui/PHUIInfoPanelView.php',
     'PHUIInfoView' => 'view/form/PHUIInfoView.php',
+    'PHUIInvisibleCharacterTestCase' => 'view/phui/__tests__/PHUIInvisibleCharacterTestCase.php',
+    'PHUIInvisibleCharacterView' => 'view/phui/PHUIInvisibleCharacterView.php',
     'PHUIListExample' => 'applications/uiexample/examples/PHUIListExample.php',
     'PHUIListItemView' => 'view/phui/PHUIListItemView.php',
     'PHUIListView' => 'view/phui/PHUIListView.php',
@@ -6319,6 +6321,8 @@
     'PHUIInfoPanelExample' => 'PhabricatorUIExample',
     'PHUIInfoPanelView' => 'AphrontView',
     'PHUIInfoView' => 'AphrontView',
+    'PHUIInvisibleCharacterTestCase' => 'PhabricatorTestCase',
+    'PHUIInvisibleCharacterView' => 'AphrontView',
     'PHUIListExample' => 'PhabricatorUIExample',
     'PHUIListItemView' => 'AphrontTagView',
     'PHUIListView' => 'AphrontTagView',
diff --git a/src/view/phui/PHUIInvisibleCharacterView.php b/src/view/phui/PHUIInvisibleCharacterView.php
new file mode 100644
--- /dev/null
+++ b/src/view/phui/PHUIInvisibleCharacterView.php
@@ -0,0 +1,93 @@
+<?php
+
+/**
+ * API for replacing whitespace characters and some control characters with
+ * their printable representations. This is useful for debugging and
+ * displaying more helpful error messages to users.
+ *
+ */
+final class PHUIInvisibleCharacterView extends AphrontView {
+
+  private $inputText;
+  private $plainText = false;
+
+  // This is a list of the common invisible characters that are
+  // actually typeable. Other invisible characters will simply
+  // be displayed as their hex representations.
+  private static $invisibleChars = array(
+    "\x00" => 'NULL',
+    "\t" => 'TAB',
+    "\n" => 'NEWLINE',
+    "\x20" => 'SPACE',
+    );
+
+  public function __construct($input_text) {
+    $this->inputText = $input_text;
+  }
+
+  public function setPlainText($plain_text) {
+    $this->plainText = $plain_text;
+    return $this;
+  }
+
+  public function getStringParts() {
+    $input_text = $this->inputText;
+    $text_array = phutil_utf8v($input_text);
+
+    for ($ii = 0; $ii < count($text_array); $ii++) {
+      $char = $text_array[$ii];
+      $char_hex = bin2hex($char);
+      if (array_key_exists($char, self::$invisibleChars)) {
+        $text_array[$ii] = array(
+          'special' => true,
+          'value' => '<'.self::$invisibleChars[$char].'>',
+          );
+      } else if (ord($char) < 32) {
+        $text_array[$ii] = array(
+          'special' => true,
+          'value' => '<0x'.$char_hex.'>',
+          );
+      } else {
+        $text_array[$ii] = array(
+          'special' => false,
+          'value' => $char,
+          );
+      }
+    }
+    return $text_array;
+  }
+
+  private function renderHtmlArray() {
+    $html_array = array();
+    $parts = $this->getStringParts();
+    foreach ($parts as $part) {
+      if ($part['special']) {
+        $html_array[] = phutil_tag(
+          'span',
+          array('class' => 'invisible-special'),
+          $part['value']);
+      } else {
+        $html_array[] = $part['value'];
+      }
+    }
+    return $html_array;
+  }
+
+  private function renderPlainText() {
+    $parts = $this->getStringParts();
+    $res = '';
+    foreach ($parts as $part) {
+      $res .= $part['value'];
+    }
+    return $res;
+  }
+
+  public function render() {
+    if ($this->plainText) {
+      return $this->renderPlainText();
+    } else {
+      return $this->renderHtmlArray();
+    }
+  }
+
+}
diff --git a/src/view/phui/__tests__/PHUIInvisibleCharacterTestCase.php b/src/view/phui/__tests__/PHUIInvisibleCharacterTestCase.php
new file mode 100644
--- /dev/null
+++ b/src/view/phui/__tests__/PHUIInvisibleCharacterTestCase.php
@@ -0,0 +1,52 @@
+<?php
+
+final class PHUIInvisibleCharacterTestCase extends PhabricatorTestCase {
+
+  public function testEmptyString() {
+    $view = new PHUIInvisibleCharacterView('');
+    $res = $view->render();
+    $this->assertEqual($res, array());
+  }
+
+  public function testEmptyPlainText() {
+    $view = (new PHUIInvisibleCharacterView(''))
+      ->setPlainText(true);
+    $res = $view->render();
+    $this->assertEqual($res, '');
+  }
+
+  public function testWithNamedChars() {
+    $test_input = "\x00\n\t ";
+    $view = (new PHUIInvisibleCharacterView($test_input))
+      ->setPlainText(true);
+    $res = $view->render();
+    $this->assertEqual($res, '<NULL><NEWLINE><TAB><SPACE>');
+  }
+
+  public function testWithHexChars() {
+    $test_input = "abc\x01";
+    $view = (new PHUIInvisibleCharacterView($test_input))
+      ->setPlainText(true);
+    $res = $view->render();
+    $this->assertEqual($res, 'abc<0x01>');
+  }
+
+  public function testWithNamedAsHex() {
+    $test_input = "\x00\x0a\x09\x20";
+    $view = (new PHUIInvisibleCharacterView($test_input))
+      ->setPlainText(true);
+    $res = $view->render();
+    $this->assertEqual($res, '<NULL><NEWLINE><TAB><SPACE>');
+  }
+
+  public function testHtmlDecoration() {
+    $test_input = "a\x00\n\t ";
+    $view = new PHUIInvisibleCharacterView($test_input);
+    $res = $view->render();
+    $this->assertFalse($res[0] instanceof PhutilSafeHTML);
+    $this->assertTrue($res[1] instanceof PhutilSafeHTML);
+    $this->assertTrue($res[2] instanceof PhutilSafeHTML);
+    $this->assertTrue($res[3] instanceof PhutilSafeHTML);
+    $this->assertTrue($res[4] instanceof PhutilSafeHTML);
+  }
+}