ASS - Aegisub Advanced SubStation Alpha File

What is a ASS file

Files with the ending .ass are mostly linked to Aegisub. This program is used to create subtitles for videos and clips and is available for Windows, Mac OS, and Linux. The ASS file contains the textual subtitle information that is used to provide subtitles in different languages for anime, movies, TV series, and even karaoke tracks. The subtitles can be highly customized thanks to the Advanced SubStation Alpha syntax. The customization can alter the style, encoding, spacing, and orientation of the subtitle text, among others. This formatting information as well as information about the timing and sequence are saved in the ASS file. Determining different speakers with names and by color is also possible.

While many media players, such as the VideoLAN VLC player, support the use of ASS files, they cannot be edited in the players. For this, the files have to either be opened in the Aegisub program or a text editor. Since the information inside the file is saved in a plain text format, Wordpad, Notepad++, TextEdit, and the like can open the files.

Here's a small, but not exhaustive list of programs that can open ASS documents:

  • Aegisub (Windows, Mac & Linux)
  • J2 Interactive MX Player (Android)
  • MPlayer (Windows, Mac & Linux)
  • olimsoft Oplayer (iOS)
  • VideoLAN VLC media player (Windows, Mac & Linux)
  • Any Text Editor
Extension ASS
MIME type text/plain
Useful links
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