Concept · Subtitle formats
SRT vs VTT: Which Subtitle Format Should You Use?
SRT is the universal lingua franca of subtitles; WebVTT is the modern web-native upgrade with styling and positioning. For most pipelines the answer is 'SRT for exchange, VTT for the web' — here's the full reasoning.
The one-paragraph difference
SRT (SubRip) is a 1990s format: cue number, timestamp range, one or more text lines, blank line. WebVTT (VTT) is the W3C standard for the web: the same cue/timestamp skeleton, plus cue settings (position, alignment, size), styling via ::cue, and metadata cues like chapters.
Side by side
| SRT | WebVTT | |
|---|---|---|
| Age | 1990s | W3C standard (2010s, actively maintained) |
| Encoding | UTF-8, no BOM conventions vary | UTF-8 required |
| Styling | None — plain text only | ::cue CSS, voice spans, ruby |
| Positioning | None | Per-cue position, alignment, line |
| Chapters/metadata | Not supported | Native support |
| Compatibility | Everything: players, editors, YouTube, broadcast | Browsers, modern players; convert to SRT for legacy |
| Best for | Exchange, archives, legacy tools | Web delivery, accessibility, interactivity |
When SRT is the right call
Interchange: send SRT to almost any vendor, player or platform and it just works. Archives: SRT is the most durable format on earth. Anything with strict legacy compatibility — broadcast QC, older NLEs, set-top boxes — starts from SRT.
When VTT is the right call
Browser playback (video with a track element), accessibility where positioning and styling matter (reading-order cues, contrast), interactive transcripts, and anything that needs chapters or per-cue metadata. VTT is also the format modern CDN integrations expect.
What our API returns
FAQ
Common questions
Can I convert SRT to VTT?
Yes, and it's almost trivial — the cue syntax is compatible. The reverse also works but loses styling and positioning.
Does VTT support multiple languages?
VTT files are single-language; use one file per language like SRT. Some platforms use the same pattern with language metadata in the manifest.
Which one does YouTube accept?
YouTube accepts SRT, VTT and others — SRT remains the safest upload format.
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