SRT vs VTT: which subtitle format should you use?
SRT and WebVTT are the two most popular subtitle formats in use today. Both are plain text, both support cues and timings, and both work in most video players. They are not identical, though — and knowing the difference matters when you pick a format for distribution.
Quick comparison
| Feature | SRT (SubRip) | WebVTT |
|---|---|---|
| File extension | .srt | .vtt |
| Header | None | Required: WEBVTT |
| Millisecond separator | Comma: , | Period: . |
| Cue numbers | Required | Optional (cue identifiers) |
| Styling | Basic HTML tags | CSS styling blocks |
| Positioning | Limited | Built-in cue settings |
| Browser support | Via JS players | Native <track> |
When to use SRT
- Desktop video players (VLC, MPC-HC, mpv).
- Most editing software (Premiere, Final Cut, DaVinci Resolve, Aegisub).
- YouTube uploads — YouTube accepts SRT and converts it automatically.
- Broadcast and DVD authoring.
- Anywhere the format must be "just works" without transformation.
When to use VTT
- HTML5
<video>with<track>element captions. - Custom video players in JavaScript.
- Any web-first distribution where captions are rendered by the browser.
- Captions that need positioning, styling or per-cue CSS.
The conversion reality
SRT → VTT is a safe conversion: add the header, change comma to period, keep cue numbers as identifiers. VTT → SRT is mostly safe: remove the header, change period to comma, renumber cues. What is lost in VTT → SRT is anything SRT cannot represent: positioning, CSS styling blocks and region definitions.
You can convert both directions on this site:
The practical rule
If you are publishing to the web with an HTML5 video player, use VTT. For everything else, use SRT. If you must pick one format for a broad distribution, SRT is the safest choice — it is more widely supported by desktop players and editing tools, and it converts cleanly to VTT.