diff --git a/osd_styler.lua b/osd_styler.lua
new file mode 100644
index 0000000..be8cb37
--- /dev/null
+++ b/osd_styler.lua
@@ -0,0 +1,61 @@
+--[[
+A helper class for styling OSD messages
+http://docs.aegisub.org/3.2/ASS_Tags/
+
+Copyright (C) 2021 Ren Tatsumoto
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+]]
+
+local OSD = {}
+OSD.__index = OSD
+
+function OSD:new()
+    return setmetatable({ text = {} }, self)
+end
+
+function OSD:append(s)
+    table.insert(self.text, s)
+    return self
+end
+
+function OSD:bold(s)
+    return self:append(string.format([[{\b1}%s{\b0}]], s))
+end
+
+function OSD:italics(s)
+    return self:append('{\\i1}'):append(s):append('{\\i0}')
+end
+
+function OSD:newline()
+    return self:append([[\N]])
+end
+
+function OSD:tab()
+    return self:append([[\h\h\h\h]])
+end
+
+function OSD:size(size)
+    return self:append(string.format([[{\fs%s}]], size))
+end
+
+function OSD:align(number)
+    return self:append(string.format([[{\an%s}]], number))
+end
+
+function OSD:get_text()
+    return table.concat(self.text)
+end
+
+return OSD
diff --git a/videoclip.lua b/videoclip.lua
index 51f6955..45afa3a 100644
--- a/videoclip.lua
+++ b/videoclip.lua
@@ -1,6 +1,7 @@
 local mp = require('mp')
 local mpopt = require('mp.options')
 local utils = require('mp.utils')
+local OSD = require('osd_styler')
 
 -- Options can be changed here or in a separate config file.
 -- Config path: ~/.config/mpv/script-opts/videoclip.conf
@@ -30,7 +31,6 @@ mpopt.read_options(config, 'videoclip')
 local main_menu
 local pref_menu
 local encoder
-local OSD
 local Timings
 
 local allowed_presets = {
@@ -469,50 +469,6 @@ function pref_menu:update()
     self:overlay_draw(osd:get_text())
 end
 
-------------------------------------------------------------
--- Helper class for styling OSD messages
--- http://docs.aegisub.org/3.2/ASS_Tags/
-
-OSD = {}
-OSD.__index = OSD
-
-function OSD:new()
-    return setmetatable({ text = {} }, self)
-end
-
-function OSD:append(s)
-    table.insert(self.text, s)
-    return self
-end
-
-function OSD:bold(s)
-    return self:append(string.format([[{\b1}%s{\b0}]], s))
-end
-
-function OSD:italics(s)
-    return self:append('{\\i1}'):append(s):append('{\\i0}')
-end
-
-function OSD:newline()
-    return self:append([[\N]])
-end
-
-function OSD:tab()
-    return self:append([[\h\h\h\h]])
-end
-
-function OSD:size(size)
-    return self:append(string.format([[{\fs%s}]], size))
-end
-
-function OSD:align(number)
-    return self:append(string.format([[{\an%s}]], number))
-end
-
-function OSD:get_text()
-    return table.concat(self.text)
-end
-
 ------------------------------------------------------------
 -- Timings class