SRT vs VTT — What Is the Difference?
A complete guide to the SRT and VTT subtitle formats — format structure, timestamp syntax, browser support, styling capabilities, and when to use each.
The Short Answer
SRT (SubRip Text) is the older and more widely supported format — almost every subtitle tool, video player, and platform accepts it. VTT (WebVTT) is the W3C standard for the web — it is the only format supported by HTML5 <video> and <track> elements in browsers.
The two formats are nearly identical for basic subtitle use. The main practical differences are in the timestamp separator (comma vs dot) and a WEBVTT header requirement. Convert SRT to VTT →
Format Examples Side by Side
Detailed Comparison
| Feature | SRT | VTT (WebVTT) |
|---|---|---|
| File extension | .srt | .vtt |
| Full name | SubRip Text | Web Video Text Tracks |
| Standard body | Unofficial (de facto) | W3C Living Standard |
| Timestamp separator | Comma: 00:00:01,000 | Dot: 00:00:01.000 |
| Header required | No | Yes — first line must be WEBVTT |
| Entry numbers | Required | Optional (cue IDs) |
HTML5 video <track> | ❌ Not supported by browsers | ✅ Only supported format |
| JavaScript players | Varies (usually added via plugin) | ✅ Native support (Video.js, Plyr, etc.) |
| Desktop video players | ✅ Universal support | ✅ Most modern players |
| YouTube uploads | ✅ | ✅ |
| CSS styling support | Limited (some HTML tags) | ✅ ::cue pseudo-element, voice spans |
| Cue positioning | ❌ | ✅ line, position, align settings |
| Chapters and metadata | ❌ | ✅ Supported |
| STYLE blocks | ❌ | ✅ |
| NOTE comments | ❌ | ✅ |
| Encoding | UTF-8 recommended | UTF-8 required |
| Typical use | Video editors, downloads, hardware players | Web video, streaming, HTML5 apps |
When to Use SRT
- Importing subtitles into a video editor (Premiere Pro, DaVinci Resolve, Final Cut, CapCut)
- Sharing subtitle files for download alongside a video
- Using with hardware media players, smart TVs, and Plex/Kodi
- Uploading captions to YouTube, Vimeo, or Wistia
- Working with subtitle databases like OpenSubtitles
When to Use VTT
- Adding captions to an HTML5
<video>element using<track kind="subtitles"> - Serving subtitles via a CDN or streaming platform that requires WebVTT
- Using CSS to style captions via the
::cueselector - Implementing interactive chapters or metadata cues in a video player
- Using JavaScript video players that natively load VTT (Video.js, Shaka Player, hls.js)
VTT-Exclusive Features
VTT offers capabilities that SRT does not have:
Cue settings (position, alignment)
CSS styling via ::cue
Chapters (for navigation)
None of these are available in standard SRT. For web video applications, VTT is the better choice.
Frequently Asked Questions
What is the difference between SRT and VTT?
SRT uses comma millisecond separators (00:00:01,000) and requires sequential numbers. VTT uses dot separators (00:00:01.000), a WEBVTT header, and is the W3C standard for HTML5 video. VTT also supports CSS styling and cue positioning.
Should I use SRT or VTT for YouTube?
YouTube accepts both. SRT is slightly simpler for YouTube workflows. Both produce the same result once uploaded to YouTube.
Can browsers play SRT files natively?
No. The HTML5 <track> element requires WebVTT. To add subtitles to a web video, you need VTT. Use the SRT to VTT converter to create a compatible file.
Is VTT replacing SRT?
For web video, VTT is the standard. But SRT remains the dominant format for video editors, downloadable content, hardware players, and subtitle databases. Both will coexist for the foreseeable future, and converting between them is trivial.
How do I convert SRT to VTT?
Use the free SRT to VTT converter — drag in your .srt file and download the .vtt. The conversion changes comma separators to dots and adds the WEBVTT header.