diff --git a/README.md b/README.md
index 1287d30..f433edb 100644
--- a/README.md
+++ b/README.md
@@ -101,3 +101,8 @@ Options:
  a function, the function will be called with the invalid characters and it's
  return value will be used as the replacement. See [`String.prototype.replace`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace)
  for more info.
+ * `options.sanitizeWindows`: *optional, boolean, default: `true`*. If falsy,
+ Windows-reserved filenames and trailing periods or spaces will not be
+ sanitized.
+ * `options.truncate`: *optional, boolean, default: `true`*. If falsy,
+ resulting filenames will not be truncated to 255 bytes.
\ No newline at end of file
diff --git a/index.js b/index.js
index b32e77c..c22718a 100644
--- a/index.js
+++ b/index.js
@@ -36,21 +36,34 @@ var reservedRe = /^\.+$/;
 var windowsReservedRe = /^(con|prn|aux|nul|com[0-9]|lpt[0-9])(\..*)?$/i;
 var windowsTrailingRe = /[\. ]+$/;
 
-function sanitize(input, replacement) {
+var defaultOptions = {
+  replacement: '',
+  sanitizeWindows: true,
+  truncate: true
+}
+
+function sanitize(input, replacement, options) {
+  options = Object.assign({}, defaultOptions, options)
   var sanitized = input
     .replace(illegalRe, replacement)
     .replace(controlRe, replacement)
-    .replace(reservedRe, replacement)
-    .replace(windowsReservedRe, replacement)
-    .replace(windowsTrailingRe, replacement);
-  return truncate(sanitized, 255);
+    .replace(reservedRe, replacement);
+  if (options.sanitizeWindows) {
+    sanitized = sanitized
+      .replace(windowsReservedRe, replacement)
+      .replace(windowsTrailingRe, replacement);
+  }
+  if (options.truncate) {
+    return truncate(sanitized, 255);
+  }
+  return sanitized
 }
 
 module.exports = function (input, options) {
-  var replacement = (options && options.replacement) || '';
-  var output = sanitize(input, replacement);
+  var replacement = (options && options.replacement) || defaultOptions.replacement;
+  var output = sanitize(input, replacement, options);
   if (replacement === '') {
     return output;
   }
-  return sanitize(output, '');
+  return sanitize(output, '', options);
 };
diff --git a/package.json b/package.json
index 13ca38d..7d17138 100644
--- a/package.json
+++ b/package.json
@@ -19,6 +19,7 @@
   },
   "scripts": {
     "test": "tape test.js",
+    "test-unit": "tape test.js --unit-only",
     "test-browser": "zuul --local --open -- test.js",
     "test-browser-sauce": "zuul -- test.js"
   },
diff --git a/test.js b/test.js
index 3995653..ccce5d6 100644
--- a/test.js
+++ b/test.js
@@ -11,6 +11,14 @@ var REPLACEMENT_OPTS = {
   replacement: "_",
 };
 
+var NO_WINDOWS_OPTS = {
+  sanitizeWindows: false
+}
+
+var NO_TRUNCATE_OPTS = {
+  truncate: false
+}
+
 test("valid names", function(t) {
   ["the quick brown fox jumped over the lazy dog.mp3",
     "résumé"].forEach(function(name) {
@@ -100,6 +108,16 @@ test("reserved filename in Windows with replacement", function(t) {
   t.end();
 });
 
+test("reserved filename in Windows with sanitizeWindows false", function(t) {
+  t.equal(sanitize("con", NO_WINDOWS_OPTS), "con");
+  t.equal(sanitize("COM1", NO_WINDOWS_OPTS), "COM1");
+  t.equal(sanitize("PRN.", NO_WINDOWS_OPTS), "PRN.");
+  t.equal(sanitize("aux.txt", NO_WINDOWS_OPTS), "aux.txt");
+  t.equal(sanitize("LPT9.asdfasdf", NO_WINDOWS_OPTS), "LPT9.asdfasdf");
+  t.equal(sanitize("LPT10.txt", NO_WINDOWS_OPTS), "LPT10.txt");
+  t.end();
+});
+
 test("invalid replacement", function (t) {
   t.equal(sanitize(".", { replacement: "."}), "");
   t.equal(sanitize("foo?.txt", { replacement: ">"}), "foo.txt");
@@ -115,6 +133,13 @@ test("255 characters max", function(t) {
   t.end();
 });
 
+test("no character maximum with truncate false", function(t) {
+  var string = repeat("a", 300);
+  t.ok(string.length > 255);
+  t.ok(sanitize(string, NO_TRUNCATE_OPTS).length === 300);
+  t.end();
+});
+
 // Test the handling of non-BMP chars in UTF-8
 //
 
@@ -168,7 +193,7 @@ function testStringUsingFS(str, t) {
 }
 
 // Don't run these tests in browser environments
-if ( ! process.browser) {
+if (!process.browser && !process.argv.find(arg => arg === '--unit-only')) {
   // ## Browserify Build
   //
   // Make sure Buffer is not used when building using browserify.