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SRT vs VTT vs ASS: Which Subtitle Format Should You Use?
Compare subtitle compatibility, styling, metadata, timing syntax, and conversion risks across SRT, WebVTT, and ASS.
SRT: the compatibility default
SubRip SRT is simple, readable, and supported by most desktop players, TVs, and editing tools. It stores numbered cues with start and end timestamps. Styling support is limited and inconsistent.
1 00:00:03,500 --> 00:00:06,200 Where are we going?
WebVTT: subtitles for the web
WebVTT uses a WEBVTT header, periods for milliseconds, and optional cue settings. It integrates with the HTML video element and supports metadata that SRT cannot represent.
WEBVTT 00:00:03.500 --> 00:00:06.200 align:middle Where are we going?
ASS/SSA: advanced typesetting
Advanced SubStation Alpha supports fonts, positioning, colors, animation, karaoke, and reusable styles. It is common in anime and fansubbing, but many web and television players ignore its advanced features.
Choose by destination
Use SRT for broad playback compatibility, VTT for browser video, and ASS when visual typesetting is essential. Converting ASS to SRT preserves dialogue and timing but usually discards positioning and style instructions.
- VLC/Plex/basic playback: SRT
- HTML5 video: VTT
- Anime typesetting/karaoke: ASS
- Transcription interchange: SRT or VTT
Frequently asked questions
- Can SRT contain colors and fonts?
- Some players accept limited markup, but support is not consistent. ASS is more appropriate for controlled styling.
- Why does VTT use a period instead of a comma?
- WebVTT timestamps use a period before milliseconds; SRT conventionally uses a comma.
- Will conversion preserve every style?
- Only when the target format supports the same feature. Converting to SRT usually removes advanced styling.