Files with the .SRT extension contain subtitles for video materials in the form of a text file, including data such as the chronological subtitle number, the viewing time – namely the beginning and end in the form of a time code HH: MM: SS, MIL, which transcribes to hour: minute: second, millisecond – the subtitle contents, as well as its location on the screen. The subtitles are saved in the SubRip format and are used when viewing DivX and DVD films by various video players. If there is no information about the location of the subtitles on the screen provided after the ending time code, the text will, by default, be displayed at the bottom of the screen, in the middle horizontally.

The files themselves do not contain any video data. Their names are usually the same as the names of their respective video files, with only the last part and the extension being different. Usually, the SRT extension is preceded by a letter code for the language in which the subtitles are written, such as video_name.PL.SRT – in this case, those are Polish subtitles for a video called video_name.