diff --git a/index.js b/index.js
index 1da4f17..69ce5f9 100644
--- a/index.js
+++ b/index.js
@@ -27,11 +27,11 @@ module.exports = {
       type: 'file',
       label: 'Upload a file',
       settings: {
-        extensions: [
+        types: [
           '*',
         ],
       },
     },
   },
-  html: '<label for="{{file.id}}">{{file.label}}</label><input type="{{file.type}}" id="{{file.id}}" name="{{file.name}}" value="{{file.value}}" placeholder="{{file.placeholder}}" />',
+  html: '<label for="{{file.id}}">{{file.label}}</label><input type="{{file.type}}" id="{{file.id}}" name="{{file.name}}" value="{{file.value}}" {% if settings.types %}{%set comma = joiner() %}accept="{% for type in settings.type %}{{comma()}}{{type}}{% endfor %}{% endif %}" />',
 };
diff --git a/lib/validation.js b/lib/validation.js
index 68ec234..77a0966 100644
--- a/lib/validation.js
+++ b/lib/validation.js
@@ -19,6 +19,18 @@
  * @module fileValidation
  */
 
-module.exports = function fileValidation() {
+module.exports = function fileValidation(input, settings) {
+  let extension = '.';
+
+  if (input.target.value && settings.target.types && Array.isArray(settings.target.types)) {
+    if (settings.target.types.length > 1 || settings.target.types[0] !== '*') {
+      extension += input.target.value.split('.').pop();
+
+      if (settings.target.types.indexOf(extension) < 0) {
+        return `Invalid extension '${extension}'. Valid extensions are '${settings.target.types.join(', ')}'`;
+      }
+    }
+  }
+
   return true;
 };
diff --git a/tests/validation.js b/tests/validation.js
index bda25ec..1a8aa5d 100644
--- a/tests/validation.js
+++ b/tests/validation.js
@@ -1,29 +1,180 @@
 import test from 'ava';
 import validation from '../lib/validation';
 
-const input = {
-  target: {
-    name: 'boolean',
-    value: 'foo bar baz',
-  },
-  all: {
-    boolean: 'foo bar baz',
-  },
-};
-
-const settings = {
-  target: {
-    empty: false,
-  },
-  all: {
-    boolean: {
-      empty: false,
-    },
-  },
-};
-
-
-// Valid input
-test('valid input', t => {
+test('Empty Input', t => {
+  const input = {
+    target: {
+      name: 'file',
+      value: '',
+    },
+    all: {
+      file: '',
+    },
+  };
+
+  const settings = {
+    target: {
+      types: [
+        '*',
+      ],
+    },
+    all: {
+      file: {
+        types: [
+          '*',
+        ],
+      },
+    },
+  };
+
+  t.true(validation(input, settings), 'Empty input returns true');
+});
+
+test('Valid Input - All Accepted', t => {
+  const input = {
+    target: {
+      name: 'file',
+      value: 'punchcard.svg',
+    },
+    all: {
+      file: 'punchcard.svg',
+    },
+  };
+
+  const settings = {
+    target: {
+      types: [
+        '*',
+      ],
+    },
+    all: {
+      file: {
+        types: [
+          '*',
+        ],
+      },
+    },
+  };
+
+  t.true(validation(input, settings), 'Valid input returns true');
+});
+
+test('Valid Input - Single Type Accepted', t => {
+  const input = {
+    target: {
+      name: 'file',
+      value: 'punchcard.svg',
+    },
+    all: {
+      file: 'punchcard.svg',
+    },
+  };
+
+  const settings = {
+    target: {
+      types: [
+        '.svg',
+      ],
+    },
+    all: {
+      file: {
+        types: [
+          '.svg',
+        ],
+      },
+    },
+  };
+
+  t.true(validation(input, settings), 'Valid input returns true');
+});
+
+test('Valid Input - Multiple Types Accepted', t => {
+  const input = {
+    target: {
+      name: 'file',
+      value: 'punchcard.svg',
+    },
+    all: {
+      file: 'punchcard.svg',
+    },
+  };
+
+  const settings = {
+    target: {
+      types: [
+        '.svg',
+        '.jpeg',
+      ],
+    },
+    all: {
+      file: {
+        types: [
+          '.svg',
+          '.jpeg',
+        ],
+      },
+    },
+  };
+
   t.true(validation(input, settings), 'Valid input returns true');
 });
+
+test('Invalid Input - Single Types Accepted', t => {
+  const input = {
+    target: {
+      name: 'file',
+      value: 'punchcard.png',
+    },
+    all: {
+      file: 'punchcard.png',
+    },
+  };
+
+  const settings = {
+    target: {
+      types: [
+        '.svg',
+      ],
+    },
+    all: {
+      file: {
+        types: [
+          '.svg',
+        ],
+      },
+    },
+  };
+
+  t.is(validation(input, settings), 'Invalid extension \'.png\'. Valid extensions are \'.svg\'', 'Invalid input returns with string');
+});
+
+test('Invalid Input - Multiple Types Accepted', t => {
+  const input = {
+    target: {
+      name: 'file',
+      value: 'punchcard.png',
+    },
+    all: {
+      file: 'punchcard.png',
+    },
+  };
+
+  const settings = {
+    target: {
+      types: [
+        '.svg',
+        '.jpeg',
+      ],
+    },
+    all: {
+      file: {
+        types: [
+          '.svg',
+          '.jpeg',
+        ],
+      },
+    },
+  };
+
+  t.is(validation(input, settings), 'Invalid extension \'.png\'. Valid extensions are \'.svg, .jpeg\'', 'Invalid input returns with string');
+});