The player even identifies and automatically adds subtitles to videos based on the file name. Font size in pixels overrides Relative font size selection VLC Media player is great for loading custom or external subtitle files. Go to Tools → Preferences (set Show Settings to All) and Video → Subtitles/OSD → Text renderer and adjust anything you want. Set show settings to Full, then go to Video > Subtitles/OSD > Text renderer - there you can change the font size in pixels Font settings cannot be changed for rich text (e.g.