diff --git a/__tests__/files/index.test.ts b/__tests__/files/index.test.ts
new file mode 100644
index 0000000..fa45152
--- /dev/null
+++ b/__tests__/files/index.test.ts
@@ -0,0 +1,11 @@
+import { getExtensionFromMimeType } from '../../src/files'
+
+describe('Files', () => {
+  it('Should correct file extension from mimeType', () => {
+    expect(getExtensionFromMimeType('video/mp4')).toEqual('mp4')
+  })
+
+  it('Should return null as mimeType is unkown', () => {
+    expect(getExtensionFromMimeType('log/banana')).toBeNull()
+  })
+})
diff --git a/package-lock.json b/package-lock.json
index 163e5ce..04e6b3b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "adapcon-utils-js",
-  "version": "0.16.6",
+  "version": "0.16.7",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 2b658b4..63cacdd 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "adapcon-utils-js",
-  "version": "0.16.6",
+  "version": "0.16.7",
   "description": "Utils library for Javascript",
   "keywords": [],
   "author": {
diff --git a/src/files/extensions.ts b/src/files/extensions.ts
new file mode 100644
index 0000000..9023aca
--- /dev/null
+++ b/src/files/extensions.ts
@@ -0,0 +1,28 @@
+export enum FILE_EXTENSIONS {
+  'video/mp4' = 'mp4',
+  'audio/ogg; codecs=opus' = 'ogg',
+  'image/gif' = 'gif',
+  'image/jpeg' = 'jpg',
+  'image/svg+xml' = 'svg',
+  'image/tiff' = 'tiff',
+  'image/png' = 'png',
+  'image/bmp' = 'bmp',
+  'text/html' = 'html',
+  'text/csv' = 'csv',
+  'text/css' = 'css',
+  'text/plain' = 'txt',
+  'text/xml' = 'xml',
+  'text/tab-separated-values' = 'tsv',
+  'application/pdf' = 'pdf',
+  'application/xml' = 'xml',
+  'application/zip' = 'zip',
+  'application/x-compressed-zip' = 'zip',
+  'application/vnd.ms-excel' = 'xls',
+  'application/x-bzip2' = 'bz2',
+  'application/msword' = 'doc',
+  'application/x-gzip' = 'gz',
+  'application/java-archive' = 'jar',
+  'application/x-javascript' = 'js',
+  'application/vnd.ms-powerpoint' = 'ppt',
+  'application/x-tar' = 'tar.gz'
+}
diff --git a/src/files/index.ts b/src/files/index.ts
new file mode 100644
index 0000000..6dc00d1
--- /dev/null
+++ b/src/files/index.ts
@@ -0,0 +1,2 @@
+export * from './extensions'
+export * from './utils'
diff --git a/src/files/utils.ts b/src/files/utils.ts
new file mode 100644
index 0000000..7f15d2e
--- /dev/null
+++ b/src/files/utils.ts
@@ -0,0 +1,5 @@
+import { FILE_EXTENSIONS } from '.'
+
+export function getExtensionFromMimeType (mimeType: string): string | null {
+  return FILE_EXTENSIONS[mimeType] || null
+}
diff --git a/src/index.ts b/src/index.ts
index 9fea3da..93ffb34 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -4,6 +4,7 @@ export * from './date'
 export * from './dynamoose'
 export * from './email'
 export * from './error'
+export * from './files'
 export * from './http'
 export * from './image'
 export * from './invoice'