Are you having trouble getting a specific movie to these subtitles, or are you looking to convert them? What Is an IDX File? - Lifewire

An idx subtitle file is not a subtitle itself; it is the file for the corresponding .sub file.

Most modern media players handle IDX/SUB files automatically, provided they are named correctly.

If your player doesn't support them, you can use online converters to turn them into the more universal .srt format.

Contains the actual graphical images of the subtitles (ripped directly from the VOB files on a DVD).

Your video file and subtitle files must share the exact same name.

You cannot simply open an IDX file and change the words. You must use specialized tools like Subtitle Edit to perform OCR (Optical Character Recognition) to convert them to text. File Size

If you have an MKV video file that already has IDX/SUB subtitles inside it, you can extract them.

There are two types of editing:

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