diff --git a/CMakeLists.txt b/CMakeLists.txt
index d622abeda..622fefc41 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -419,6 +419,7 @@ set(TDLIB_SOURCE
   td/telegram/files/FileManager.cpp
   td/telegram/files/FileStats.cpp
   td/telegram/files/FileStatsWorker.cpp
+  td/telegram/files/FileType.cpp
   td/telegram/files/FileUploader.cpp
   td/telegram/files/PartsManager.cpp
   td/telegram/files/ResourceManager.cpp
diff --git a/td/telegram/files/FileType.cpp b/td/telegram/files/FileType.cpp
new file mode 100644
index 000000000..b5f010845
--- /dev/null
+++ b/td/telegram/files/FileType.cpp
@@ -0,0 +1,181 @@
+//
+// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+#include "td/telegram/files/FileType.h"
+
+namespace td {
+
+FileType from_td_api(const td_api::FileType &file_type) {
+  switch (file_type.get_id()) {
+    case td_api::fileTypeThumbnail::ID:
+      return FileType::Thumbnail;
+    case td_api::fileTypeProfilePhoto::ID:
+      return FileType::ProfilePhoto;
+    case td_api::fileTypePhoto::ID:
+      return FileType::Photo;
+    case td_api::fileTypeVoiceNote::ID:
+      return FileType::VoiceNote;
+    case td_api::fileTypeVideo::ID:
+      return FileType::Video;
+    case td_api::fileTypeDocument::ID:
+      return FileType::Document;
+    case td_api::fileTypeSecret::ID:
+      return FileType::Encrypted;
+    case td_api::fileTypeUnknown::ID:
+      return FileType::Temp;
+    case td_api::fileTypeSticker::ID:
+      return FileType::Sticker;
+    case td_api::fileTypeAudio::ID:
+      return FileType::Audio;
+    case td_api::fileTypeAnimation::ID:
+      return FileType::Animation;
+    case td_api::fileTypeSecretThumbnail::ID:
+      return FileType::EncryptedThumbnail;
+    case td_api::fileTypeWallpaper::ID:
+      return FileType::Background;
+    case td_api::fileTypeVideoNote::ID:
+      return FileType::VideoNote;
+    case td_api::fileTypeSecure::ID:
+      return FileType::Secure;
+    case td_api::fileTypeNone::ID:
+      return FileType::None;
+    default:
+      UNREACHABLE();
+      return FileType::None;
+  }
+}
+
+tl_object_ptr<td_api::FileType> as_td_api(FileType file_type) {
+  switch (file_type) {
+    case FileType::Thumbnail:
+      return make_tl_object<td_api::fileTypeThumbnail>();
+    case FileType::ProfilePhoto:
+      return make_tl_object<td_api::fileTypeProfilePhoto>();
+    case FileType::Photo:
+      return make_tl_object<td_api::fileTypePhoto>();
+    case FileType::VoiceNote:
+      return make_tl_object<td_api::fileTypeVoiceNote>();
+    case FileType::Video:
+      return make_tl_object<td_api::fileTypeVideo>();
+    case FileType::Document:
+      return make_tl_object<td_api::fileTypeDocument>();
+    case FileType::Encrypted:
+      return make_tl_object<td_api::fileTypeSecret>();
+    case FileType::Temp:
+      return make_tl_object<td_api::fileTypeUnknown>();
+    case FileType::Sticker:
+      return make_tl_object<td_api::fileTypeSticker>();
+    case FileType::Audio:
+      return make_tl_object<td_api::fileTypeAudio>();
+    case FileType::Animation:
+      return make_tl_object<td_api::fileTypeAnimation>();
+    case FileType::EncryptedThumbnail:
+      return make_tl_object<td_api::fileTypeSecretThumbnail>();
+    case FileType::Wallpaper:
+      return make_tl_object<td_api::fileTypeWallpaper>();
+    case FileType::VideoNote:
+      return make_tl_object<td_api::fileTypeVideoNote>();
+    case FileType::Secure:
+      return make_tl_object<td_api::fileTypeSecure>();
+    case FileType::SecureRaw:
+      UNREACHABLE();
+      return make_tl_object<td_api::fileTypeSecure>();
+    case FileType::Background:
+      return make_tl_object<td_api::fileTypeWallpaper>();
+    case FileType::DocumentAsFile:
+      return make_tl_object<td_api::fileTypeDocument>();
+    case FileType::None:
+      return make_tl_object<td_api::fileTypeNone>();
+    default:
+      UNREACHABLE();
+      return nullptr;
+  }
+}
+
+CSlice get_file_type_name(FileType file_type) {
+  switch (file_type) {
+    case FileType::Thumbnail:
+      return CSlice("thumbnails");
+    case FileType::ProfilePhoto:
+      return CSlice("profile_photos");
+    case FileType::Photo:
+      return CSlice("photos");
+    case FileType::VoiceNote:
+      return CSlice("voice");
+    case FileType::Video:
+      return CSlice("videos");
+    case FileType::Document:
+      return CSlice("documents");
+    case FileType::Encrypted:
+      return CSlice("secret");
+    case FileType::Temp:
+      return CSlice("temp");
+    case FileType::Sticker:
+      return CSlice("stickers");
+    case FileType::Audio:
+      return CSlice("music");
+    case FileType::Animation:
+      return CSlice("animations");
+    case FileType::EncryptedThumbnail:
+      return CSlice("secret_thumbnails");
+    case FileType::Wallpaper:
+      return CSlice("wallpapers");
+    case FileType::VideoNote:
+      return CSlice("video_notes");
+    case FileType::SecureRaw:
+      return CSlice("passport");
+    case FileType::Secure:
+      return CSlice("passport");
+    case FileType::Background:
+      return CSlice("wallpapers");
+    case FileType::DocumentAsFile:
+      return CSlice("documents");
+    case FileType::Size:
+    case FileType::None:
+    default:
+      UNREACHABLE();
+      return CSlice("none");
+  }
+}
+
+StringBuilder &operator<<(StringBuilder &string_builder, FileType file_type) {
+  return string_builder << get_file_type_name(file_type);
+}
+
+FileDirType get_file_dir_type(FileType file_type) {
+  switch (file_type) {
+    case FileType::Thumbnail:
+    case FileType::ProfilePhoto:
+    case FileType::Encrypted:
+    case FileType::Sticker:
+    case FileType::Temp:
+    case FileType::Wallpaper:
+    case FileType::EncryptedThumbnail:
+    case FileType::Secure:
+    case FileType::SecureRaw:
+    case FileType::Background:
+      return FileDirType::Secure;
+    default:
+      return FileDirType::Common;
+  }
+}
+
+bool is_file_big(FileType file_type, int64 expected_size) {
+  switch (file_type) {
+    case FileType::Thumbnail:
+    case FileType::ProfilePhoto:
+    case FileType::Photo:
+    case FileType::EncryptedThumbnail:
+      return false;
+    default:
+      break;
+  }
+
+  constexpr int64 SMALL_FILE_MAX_SIZE = 10 << 20;
+  return expected_size > SMALL_FILE_MAX_SIZE;
+}
+
+}  // namespace td
diff --git a/td/telegram/files/FileType.h b/td/telegram/files/FileType.h
index 1698457e8..7718daea0 100644
--- a/td/telegram/files/FileType.h
+++ b/td/telegram/files/FileType.h
@@ -37,178 +37,20 @@ enum class FileType : int32 {
   None
 };
 
-inline FileType from_td_api(const td_api::FileType &file_type) {
-  switch (file_type.get_id()) {
-    case td_api::fileTypeThumbnail::ID:
-      return FileType::Thumbnail;
-    case td_api::fileTypeProfilePhoto::ID:
-      return FileType::ProfilePhoto;
-    case td_api::fileTypePhoto::ID:
-      return FileType::Photo;
-    case td_api::fileTypeVoiceNote::ID:
-      return FileType::VoiceNote;
-    case td_api::fileTypeVideo::ID:
-      return FileType::Video;
-    case td_api::fileTypeDocument::ID:
-      return FileType::Document;
-    case td_api::fileTypeSecret::ID:
-      return FileType::Encrypted;
-    case td_api::fileTypeUnknown::ID:
-      return FileType::Temp;
-    case td_api::fileTypeSticker::ID:
-      return FileType::Sticker;
-    case td_api::fileTypeAudio::ID:
-      return FileType::Audio;
-    case td_api::fileTypeAnimation::ID:
-      return FileType::Animation;
-    case td_api::fileTypeSecretThumbnail::ID:
-      return FileType::EncryptedThumbnail;
-    case td_api::fileTypeWallpaper::ID:
-      return FileType::Background;
-    case td_api::fileTypeVideoNote::ID:
-      return FileType::VideoNote;
-    case td_api::fileTypeSecure::ID:
-      return FileType::Secure;
-    case td_api::fileTypeNone::ID:
-      return FileType::None;
-    default:
-      UNREACHABLE();
-      return FileType::None;
-  }
-}
-
-inline tl_object_ptr<td_api::FileType> as_td_api(FileType file_type) {
-  switch (file_type) {
-    case FileType::Thumbnail:
-      return make_tl_object<td_api::fileTypeThumbnail>();
-    case FileType::ProfilePhoto:
-      return make_tl_object<td_api::fileTypeProfilePhoto>();
-    case FileType::Photo:
-      return make_tl_object<td_api::fileTypePhoto>();
-    case FileType::VoiceNote:
-      return make_tl_object<td_api::fileTypeVoiceNote>();
-    case FileType::Video:
-      return make_tl_object<td_api::fileTypeVideo>();
-    case FileType::Document:
-      return make_tl_object<td_api::fileTypeDocument>();
-    case FileType::Encrypted:
-      return make_tl_object<td_api::fileTypeSecret>();
-    case FileType::Temp:
-      return make_tl_object<td_api::fileTypeUnknown>();
-    case FileType::Sticker:
-      return make_tl_object<td_api::fileTypeSticker>();
-    case FileType::Audio:
-      return make_tl_object<td_api::fileTypeAudio>();
-    case FileType::Animation:
-      return make_tl_object<td_api::fileTypeAnimation>();
-    case FileType::EncryptedThumbnail:
-      return make_tl_object<td_api::fileTypeSecretThumbnail>();
-    case FileType::Wallpaper:
-      return make_tl_object<td_api::fileTypeWallpaper>();
-    case FileType::VideoNote:
-      return make_tl_object<td_api::fileTypeVideoNote>();
-    case FileType::Secure:
-      return make_tl_object<td_api::fileTypeSecure>();
-    case FileType::SecureRaw:
-      UNREACHABLE();
-      return make_tl_object<td_api::fileTypeSecure>();
-    case FileType::Background:
-      return make_tl_object<td_api::fileTypeWallpaper>();
-    case FileType::DocumentAsFile:
-      return make_tl_object<td_api::fileTypeDocument>();
-    case FileType::None:
-      return make_tl_object<td_api::fileTypeNone>();
-    default:
-      UNREACHABLE();
-      return nullptr;
-  }
-}
+enum class FileDirType : int8 { Secure, Common };
 
 constexpr int32 file_type_size = static_cast<int32>(FileType::Size);
 
-inline CSlice get_file_type_name(FileType file_type) {
-  switch (file_type) {
-    case FileType::Thumbnail:
-      return CSlice("thumbnails");
-    case FileType::ProfilePhoto:
-      return CSlice("profile_photos");
-    case FileType::Photo:
-      return CSlice("photos");
-    case FileType::VoiceNote:
-      return CSlice("voice");
-    case FileType::Video:
-      return CSlice("videos");
-    case FileType::Document:
-      return CSlice("documents");
-    case FileType::Encrypted:
-      return CSlice("secret");
-    case FileType::Temp:
-      return CSlice("temp");
-    case FileType::Sticker:
-      return CSlice("stickers");
-    case FileType::Audio:
-      return CSlice("music");
-    case FileType::Animation:
-      return CSlice("animations");
-    case FileType::EncryptedThumbnail:
-      return CSlice("secret_thumbnails");
-    case FileType::Wallpaper:
-      return CSlice("wallpapers");
-    case FileType::VideoNote:
-      return CSlice("video_notes");
-    case FileType::SecureRaw:
-      return CSlice("passport");
-    case FileType::Secure:
-      return CSlice("passport");
-    case FileType::Background:
-      return CSlice("wallpapers");
-    case FileType::DocumentAsFile:
-      return CSlice("documents");
-    case FileType::Size:
-    case FileType::None:
-    default:
-      UNREACHABLE();
-      return CSlice("none");
-  }
-}
+FileType from_td_api(const td_api::FileType &file_type);
 
-inline StringBuilder &operator<<(StringBuilder &string_builder, FileType file_type) {
-  return string_builder << get_file_type_name(file_type);
-}
+tl_object_ptr<td_api::FileType> as_td_api(FileType file_type);
 
-enum class FileDirType : int8 { Secure, Common };
+CSlice get_file_type_name(FileType file_type);
 
-inline FileDirType get_file_dir_type(FileType file_type) {
-  switch (file_type) {
-    case FileType::Thumbnail:
-    case FileType::ProfilePhoto:
-    case FileType::Encrypted:
-    case FileType::Sticker:
-    case FileType::Temp:
-    case FileType::Wallpaper:
-    case FileType::EncryptedThumbnail:
-    case FileType::Secure:
-    case FileType::SecureRaw:
-    case FileType::Background:
-      return FileDirType::Secure;
-    default:
-      return FileDirType::Common;
-  }
-}
+StringBuilder &operator<<(StringBuilder &string_builder, FileType file_type);
 
-inline bool is_file_big(FileType file_type, int64 expected_size) {
-  switch (file_type) {
-    case FileType::Thumbnail:
-    case FileType::ProfilePhoto:
-    case FileType::Photo:
-    case FileType::EncryptedThumbnail:
-      return false;
-    default:
-      break;
-  }
+FileDirType get_file_dir_type(FileType file_type);
 
-  constexpr int64 SMALL_FILE_MAX_SIZE = 10 << 20;
-  return expected_size > SMALL_FILE_MAX_SIZE;
-}
+bool is_file_big(FileType file_type, int64 expected_size);
 
 }  // namespace td