diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..87417a2
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,8 @@
+export function zip (input: string, output: string, cb?: (err: Error | null) => void): void;
+export function zip (input: string, output: string, includeBaseDirectory: boolean, cb?: (err: Error | null) => void): void;
+
+export function zipSync (input: string, output: string, includeBaseDirectory?: boolean): void;
+
+export function unzip (input: string, output: string, cb?: (err: Error | null) => void): void;
+
+export function unzipSync (input: string, output: string): void;
diff --git a/index.js b/index.js
index 52fb9ad..57b96c5 100644
--- a/index.js
+++ b/index.js
@@ -11,74 +11,75 @@ var fs = require('fs')
 var os = require('os')
 var path = require('path')
 
-function zip (inPath, outPath, cb) {
-  if (!cb) cb = function () {}
-  if (process.platform === 'win32') {
-    fs.stat(inPath, function (err, stats) {
-      if (err) return cb(err)
-      if (stats.isFile()) {
-        copyToTemp()
-      } else {
-        doZip()
-      }
-    })
+function zip (inPath, outPath, includeBaseDirectory, cb) {
+  if (typeof includeBaseDirectory === 'boolean') {
+    if (!cb) cb = function () {}
+  } else if (typeof includeBaseDirectory === 'function') {
+    cb = includeBaseDirectory
+    includeBaseDirectory = false
   } else {
-    doZip()
+    includeBaseDirectory = arguments.length === 2 ? false : !!includeBaseDirectory
+    if (!cb) cb = function () {}
   }
 
-  // Windows zip command cannot zip files, only directories. So move the file into
-  // a temporary directory before zipping.
+  fs.stat(inPath, function (err, stats) {
+    if (err) return cb(err)
+    if (stats.isFile()) {
+      includeBaseDirectory = false
+      copyToTemp()
+    } else {
+      doZip()
+    }
+  })
+
   function copyToTemp () {
-    fs.readFile(inPath, function (err, inFile) {
+    var tmpPath = path.join(os.tmpdir(), 'cross-zip-' + Date.now())
+    fs.mkdir(tmpPath, { recursive: true }, function (err) {
       if (err) return cb(err)
-      var tmpPath = path.join(os.tmpdir(), 'cross-zip-' + Date.now())
-      fs.mkdir(tmpPath, function (err) {
+      fs.copyFile(inPath, path.join(tmpPath, path.basename(inPath)), function (err) {
         if (err) return cb(err)
-        fs.writeFile(path.join(tmpPath, path.basename(inPath)), inFile, function (err) {
-          if (err) return cb(err)
-          inPath = tmpPath
-          doZip()
-        })
+
+        inPath = tmpPath
+        doZip()
       })
     })
   }
 
   // Windows zip command does not overwrite existing files. So do it manually first.
   function doZip () {
-    if (process.platform === 'win32') {
-      fs.rmdir(outPath, { recursive: true, maxRetries: 3 }, doZip2)
-    } else {
-      doZip2()
-    }
+    fs.rmdir(outPath, { recursive: true, maxRetries: 3 }, doZip2)
   }
 
   function doZip2 () {
+    const { args, cwd } = getZipArgs(inPath, outPath, includeBaseDirectory)
     var opts = {
-      cwd: path.dirname(inPath),
+      cwd: cwd,
       maxBuffer: Infinity
     }
-    cp.execFile(getZipCommand(), getZipArgs(inPath, outPath), opts, function (err) {
+    cp.execFile(getZipCommand(), args, opts, function (err) {
       cb(err)
     })
   }
 }
 
-function zipSync (inPath, outPath) {
-  if (process.platform === 'win32') {
-    if (fs.statSync(inPath).isFile()) {
-      var inFile = fs.readFileSync(inPath)
-      var tmpPath = path.join(os.tmpdir(), 'cross-zip-' + Date.now())
-      fs.mkdirSync(tmpPath)
-      fs.writeFileSync(path.join(tmpPath, path.basename(inPath)), inFile)
-      inPath = tmpPath
-    }
-    fs.rmdirSync(outPath, { recursive: true, maxRetries: 3 })
+function zipSync (inPath, outPath, includeBaseDirectory) {
+  includeBaseDirectory = !!includeBaseDirectory
+
+  if (fs.statSync(inPath).isFile()) {
+    includeBaseDirectory = false
+    var tmpPath = path.join(os.tmpdir(), 'cross-zip-' + Date.now())
+    fs.mkdirSync(tmpPath, { recursive: true })
+    fs.copyFileSync(inPath, path.join(tmpPath, path.basename(inPath)))
+    inPath = tmpPath
   }
+  fs.rmdirSync(outPath, { recursive: true, maxRetries: 3 })
+
+  const { args, cwd } = getZipArgs(inPath, outPath, includeBaseDirectory)
   var opts = {
-    cwd: path.dirname(inPath),
+    cwd: cwd,
     maxBuffer: Infinity
   }
-  cp.execFileSync(getZipCommand(), getZipArgs(inPath, outPath), opts)
+  cp.execFileSync(getZipCommand(), args, opts)
 }
 
 function unzip (inPath, outPath, cb) {
@@ -118,18 +119,38 @@ function quotePath (pathToTransform) {
   return '"' + pathToTransform + '"'
 }
 
-function getZipArgs (inPath, outPath) {
+/**
+ * @param {string} inPath
+ * @param {string} outPath
+ * @param {boolean} includeBaseDirectory
+ * @returns {{ args: string[]; cwd: string }}
+ */
+function getZipArgs (inPath, outPath, includeBaseDirectory) {
   if (process.platform === 'win32') {
-    return [
-      '-nologo',
-      '-noprofile',
-      '-command', '& { param([String]$myInPath, [String]$myOutPath); Add-Type -A "System.IO.Compression.FileSystem"; [IO.Compression.ZipFile]::CreateFromDirectory($myInPath, $myOutPath); exit !$? }',
-      '-myInPath', quotePath(inPath),
-      '-myOutPath', quotePath(outPath)
-    ]
+    return {
+      args: [
+        '-nologo',
+        '-noprofile',
+        '-command', '& { param([String]$myInPath, [String]$myOutPath, [Boolean]$includeBaseDirectory); Add-Type -A "System.IO.Compression.FileSystem"; [IO.Compression.ZipFile]::CreateFromDirectory($myInPath, $myOutPath, [IO.Compression.CompressionLevel]::Fastest, $includeBaseDirectory); exit !$? }',
+        '-myInPath', quotePath(inPath),
+        '-myOutPath', quotePath(outPath),
+        '-includeBaseDirectory', `$${!!includeBaseDirectory}`
+      ],
+      cwd: process.cwd()
+    }
   } else {
-    var fileName = path.basename(inPath)
-    return ['-r', '-y', outPath, fileName]
+    if (includeBaseDirectory) {
+      const dir = path.dirname(inPath)
+      const fileName = path.basename(inPath)
+      return {
+        args: ['-r', '-y', outPath, fileName],
+        cwd: dir
+      }
+    }
+    return {
+      args: ['-r', '-y', outPath, '.'],
+      cwd: inPath
+    }
   }
 }
 
diff --git a/test/zip.js b/test/zip.js
index 0489bd5..98c303d 100644
--- a/test/zip.js
+++ b/test/zip.js
@@ -5,6 +5,8 @@ var zip = require('../')
 
 var filePath = path.join(__dirname, 'content', 'file.txt')
 var tmpPath = path.join(__dirname, 'tmp')
+var contentPath = path.join(__dirname, 'content')
+var tmpContentPath = path.join(__dirname, 'tmp', 'content')
 
 fs.mkdirSync(tmpPath, { recursive: true })
 
@@ -20,6 +22,23 @@ test('zipSync', function (t) {
   var file = fs.readFileSync(filePath)
 
   t.deepEqual(tmpFile, file)
+
+  var contentZipPathIncludeParentFolder = path.join(tmpPath, 'file2.zip')
+  zip.zipSync(contentPath, contentZipPathIncludeParentFolder, true)
+  zip.unzipSync(contentZipPathIncludeParentFolder, tmpPath)
+  t.ok(fs.existsSync(tmpContentPath) && fs.statSync(tmpContentPath).isDirectory())
+  t.deepEqual(fs.readFileSync(path.join(tmpContentPath, 'file.txt')), file)
+  fs.rmdirSync(tmpContentPath, { recursive: true })
+  fs.rmdirSync(contentZipPathIncludeParentFolder, { recursive: true })
+
+  var contentZipPathWithoutParentFolder = path.join(tmpPath, 'file3.zip')
+  zip.zipSync(contentPath, contentZipPathWithoutParentFolder)
+  zip.unzipSync(contentZipPathWithoutParentFolder, path.join(tmpPath, 'file3'))
+  t.ok(!fs.existsSync(tmpContentPath))
+  t.deepEqual(fs.readFileSync(path.join(tmpPath, 'file3/file.txt')), file)
+  fs.rmdirSync(contentZipPathWithoutParentFolder, { recursive: true })
+  fs.rmdirSync(path.join(tmpPath, 'file3'), { recursive: true })
+
   t.end()
 })
 
@@ -45,3 +64,55 @@ test('zip', function (t) {
     })
   })
 })
+
+test('zip dir with parent folder', function (t) {
+  t.plan(6)
+
+  var contentZipPathIncludeParentFolder = path.join(tmpPath, 'file2.zip')
+  zip.zip(contentPath, contentZipPathIncludeParentFolder, true, function (err) {
+    t.error(err)
+
+    zip.unzip(contentZipPathIncludeParentFolder, tmpPath, function (err) {
+      t.error(err)
+
+      t.ok(fs.existsSync(tmpContentPath) && fs.statSync(tmpContentPath).isDirectory())
+      var file = fs.readFileSync(filePath)
+      t.deepEqual(fs.readFileSync(path.join(tmpContentPath, 'file.txt')), file)
+      fs.rmdir(tmpContentPath, { recursive: true }, function (err) {
+        t.error(err)
+
+        fs.rmdir(contentZipPathIncludeParentFolder, { recursive: true }, function (err) {
+          t.error(err)
+        })
+      })
+    })
+  })
+})
+
+test('zip dir without parent folder', function (t) {
+  t.plan(7)
+
+  var contentZipPathWithoutParentFolder = path.join(tmpPath, 'file3.zip')
+  zip.zip(contentPath, contentZipPathWithoutParentFolder, function (err) {
+    t.error(err)
+
+    zip.unzip(contentZipPathWithoutParentFolder, path.join(tmpPath, 'file3'), function (err) {
+      t.error(err)
+
+      t.ok(!fs.existsSync(tmpContentPath))
+      var file = fs.readFileSync(filePath)
+      t.deepEqual(fs.readFileSync(path.join(tmpPath, 'file3/file.txt')), file)
+      fs.rmdir(tmpContentPath, { recursive: true }, function (err) {
+        t.error(err)
+
+        fs.rmdir(contentZipPathWithoutParentFolder, { recursive: true }, function (err) {
+          t.error(err)
+
+          fs.rmdir(path.join(tmpPath, 'file3'), { recursive: true }, function (err) {
+            t.error(err)
+          })
+        })
+      })
+    })
+  })
+})