
Here are a few that offer quality subtitles: There are several possible extensions for subtitle files one of the most common is SRT (this is a text format).Several sites offer to recover subtitle files.

However, it is more interesting to embed the subtitle file directly into the MKV file in order to have a single file containing the video, audio, chapter and subtitles. Indeed, video playback software (such as VLC or MPC-HC) are able to automatically load the subtitle files corresponding to the current video, if they are in the same directory and have the same name as the MKV file.

If you have an MKV file without proper subtitles, you can download a subtitle file from the internet, drop it in the same place as your video and then play the video with your usual player.
