Subtitle format reference
Detailed reference pages for every subtitle format you will encounter.
SRT — SubRip
The universal subtitle format. Structure, rules and common problems.
WebVTT
The browser-first subtitle format used by HTML5 <track> elements.
ASS — Advanced SubStation Alpha
Rich styling, positioning and karaoke effects for sophisticated subtitles.
SSA — SubStation Alpha
Predecessor to ASS. Legacy format still found in older releases.
SBV — YouTube SubViewer
Minimal caption format used by YouTube and some broadcasters.
SUB — MicroDVD
Frame-based timing format used in legacy DVD workflows.
JSON subtitle data
Structured cue data for programmatic subtitle processing.