SRT vs VTT: Subtitle Format Differences Explained
Published: July 1, 2025 · 4 min read
SRT and VTT are the two most common subtitle formats. Video editors, content creators, and web developers often confuse which one to use, leading to compatibility issues. Understanding the differences between them will save you time and frustration when working on video projects.
What is SRT?
SubRip Subtitle (SRT) is a plain text format that uses sequence numbers, timestamps in the format HH:MM:SS,mmm, and the subtitle text. It is supported by virtually every video player including YouTube, VLC, and desktop editing software. SRT is simple, universal, and has been the de facto standard for years.
What is VTT?
WebVTT (Web Video Text Tracks) is a W3C standard designed for HTML5. It uses a dot instead of a comma in timestamps (HH:MM:SS.mmm), supports styling such as bold, italic, and color, allows positioning cues, and includes metadata via NOTE blocks. VTT is required for the HTML5 <track> element.
Key differences
| Feature | SRT | VTT |
|---|---|---|
| Timestamp format | Comma — 00:00:20,000 | Dot — 00:00:20.000 |
| Styling support | None | Basic CSS-like |
| Browser / HTML5 support | Needs conversion | Native |
| Common use case | Desktop, YouTube | Web players |
Which one do you need?
If you are uploading to YouTube or using desktop video players, SRT works perfectly. If you are building a website with HTML5 video, you need VTT. Most projects benefit from having both formats available so you are prepared for any platform.
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