diff --git a/cli.js b/cli.js
new file mode 100644
index 0000000..0f8ce1f
--- /dev/null
+++ b/cli.js
@@ -0,0 +1,135 @@
+#!/usr/bin/env node
+'use strict';
+var os = require('os');
+var fs = require('fs');
+var meow = require('meow');
+var indentString = require('indent-string');
+var stdin = require('get-stdin');
+var css = require('css');
+var _ = require('lodash');
+var inlineCritical = require('./');
+var ok;
+
+var help = [
+  'Usage: inline-critical <input> [<option>]',
+  '',
+  'Options:',
+  '   -c, --css       Path to CSS file',
+  '   -h, --html      Path to HTML file',
+  '   -i, --ignore    Skip matching stylesheets',
+  '   -m, --minify    Minify the styles before inlining',
+  '   -e, --extract   Remove the inlined styles from any stylesheets referenced in the HTML',
+  '   -b, --base      Is used when extracting styles to find the files references by `href` attributes'
+];
+
+var cli = meow({
+  help: help
+}, {
+  alias: {
+    c: 'css',
+    h: 'html',
+    i: 'ignore',
+    m: 'minify',
+    b: 'base',
+    e: 'extract'
+  }
+});
+
+// cleanup cli flags
+cli.flags = _.reduce(cli.flags, function (res, val, key) {
+  if (key.length <= 1) {
+    return res;
+  }
+
+  switch (key) {
+    case 'css':
+    case 'html':
+      try {
+        res[key] = read(val)
+      } catch (err) {
+      }
+      break;
+    case 'base':
+      res.basePath = val;
+      break;
+    case 'ignore':
+      if (_.isString(val) || _.isRegExp(val)) {
+        val = [val];
+      }
+      res.ignore = _.map(val || [], function (ignore) {
+        // check regex
+        var match = ignore.match(/^\/(.*)\/([igmy]+)?$/);
+
+        if (match) {
+          return new RegExp(_.escapeRegExp(match[1]), match[2]);
+        }
+        return ignore;
+      });
+      break;
+    default:
+      res[key] = val;
+      break;
+  }
+
+  return res;
+}, {});
+
+function error(err) {
+  process.stderr.write(indentString(err.message || err, '   Error: '));
+  process.stderr.write(os.EOL);
+  process.stderr.write(indentString(help.join(os.EOL), '   '));
+  process.exit(1);
+}
+
+function read(file) {
+  try {
+    return fs.readFileSync(file, 'utf8');
+  } catch (err) {
+    error(err);
+  }
+}
+
+
+function run(data) {
+  var opts = _.defaults(cli.flags, {basePath: process.cwd()});
+  ok = true;
+
+  if (data) {
+    // detect html
+    try {
+      css.parse(data);
+      opts.css = data;
+    } catch (err) {
+      opts.html = data;
+    }
+  }
+
+  _.forEach(cli.input, function (file) {
+    var tmp = read(file);
+    try {
+      css.parse(tmp);
+      opts.css = tmp;
+    } catch (err) {
+      opts.html = tmp;
+    }
+  });
+
+  try {
+    var out = inlineCritical(opts.html, opts.css, opts);
+    console.log(out.toString());
+    process.exit();
+  } catch (err) {
+    error(err);
+  }
+}
+
+// get stdin
+stdin(run);
+  setTimeout(function () {
+    if (ok) {
+      return;
+    }
+    run();
+  }, 100);
+
+
diff --git a/index.js b/index.js
index 3bba0c2..0e9d203 100644
--- a/index.js
+++ b/index.js
@@ -47,6 +47,14 @@ function read(file) {
 
 module.exports = function (html, styles, options) {
 
+  if (!html) {
+    throw new Error('HTML missing!')
+  }
+
+  if (!styles) {
+    throw new Error('Styles missing!')
+  }
+
   var $ = cheerio.load(String(html), {
     decodeEntities: false
   });
diff --git a/package.json b/package.json
index 5d66add..d30aff4 100644
--- a/package.json
+++ b/package.json
@@ -23,8 +23,12 @@
     "cave": "2.0.0",
     "cheerio": "0.19.0",
     "clean-css": "3.2.10",
+    "css": "^2.2.1",
     "dom-serializer": "0.1.0",
+    "get-stdin": "^4.0.1",
+    "indent-string": "^1.2.1",
     "lodash": "^3.7.0",
+    "meow": "^3.3.0",
     "normalize-newline": "^1.0.2",
     "reaver": "1.2.0",
     "slash": "1.0.0",