IDX - Movie Subtitle File

What is a IDX file

The file extension IDX is most commonly associated with subtitle files. They are similar to the SUB file format. These files are used by certain DVD players, software as well as hardware, to display subtitles in movies. They are always saved together with the video file they belong to.

The IDX file itself does not contain any video information. Instead, it contain the text that is later displayed on top of the video data. However, the subtitle data is not saved as a text, but as a graphical representation. Additional, the IDX file contains cues that help the file to display the right subtitles at the right point in the video, mapping the text to the video information. In combination with a SUB file, the IDX file helps to map the graphically represented subtitles inside the SUB file to be correctly mapped to the video.

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

  • CyberLink PowerDVD 15 (Windows)
  • DVDSubEdit (Windows)
  • J2 Interactive MX Player (Android)
  • MPlayer (Mac)
  • SMPlayer (Linnux)
  • URUWorks Subtitle Workshop (Windows)
  • VideoLAN VLC media player (Windows, Mac & Linux)
Extension IDX
MIME type n/a
Useful links