Prepare the subtitle file in a compatible format such as .srt, .vtt, or .ass
Make sure the subtitle file name matches the video file name if using automatic loading
Place the subtitle file in the same folder as the video file
Open the video in a media player that supports subtitles
Enable subtitles in the player’s subtitle or caption menu
Use the player’s option to load an external subtitle file if needed
Adjust subtitle timing if the subtitles are out of sync
Embed subtitles into the video using video editing or conversion software if you want them permanently attached
Export or save the video with the subtitles burned in or muxed into the file
Verify the final video plays correctly with the subtitles visible