VTT file format: what it is and how to use it

WebVTT is the web's native subtitle format: HTML5 captions with cue settings, regions and positioning that browsers render without plugins. Learn when to use it and what to choose instead.

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What is a VTT file?

A .vtt file is subtitles in WebVTT, the W3C's web-native caption format: a WEBVTT header then cues with dot-decimal timings, plus optional cue settings (position, alignment, size), regions, and CSS-::cue styling hooks. It is the only subtitle format the <track> element natively understands, accessibility infrastructure, not just captions.

When should you use VTT?

  • HTML5 video: the required format for <track> captions and subtitles.
  • Styled-enough captions: positioning and styling without ASS's weight.
  • Chapters and metadata: its cue types go beyond plain subtitles.

When is another format a better fit?

For universal player compatibility, SRT still loads everywhere including ancient software. For full design control, meaning typesetting, karaoke and signs, ASS is the artist's format. VTT is the web's lane.

The short version: VTT is the subtitle format browsers speak, the required choice for HTML5 video.

How to open a VTT file

On Windows

Double-click the file, or open it with Subtitle Edit.

On macOS

VLC opens VTT files on macOS.

In your browser

Open VTT files right in a browser tab or with the dexrr viewer. No install, no upload.

Also opens in

  • Any web browser
  • VLC
  • Subtitle Edit
  • Any text editor

View or convert VTT files

A quick preview or a new format. No install, no upload.

View VTT files Preview and inspect VTT files Convert to VTT Turn files into VTT VTT to SRT SubRip subtitle VTT to ASS Advanced SubStation Alpha subtitle

VTT technical details

Full name
WebVTT subtitle
Extensions
.vtt
MIME type
text/vtt
Magic bytes
57 45 42 56 54 54 (WEBVTT)
Compression
None (uncompressed)
Developer
W3C
Specification
www.w3.org

VTT questions, answered

How do I open a .vtt file?

Any text editor; browsers render it via <track> on a video element; players like VLC read it too. dexrr displays and converts vtt files in your browser.

Can I convert VTT files online?

Yes, dexrr converts vtt locally in your browser: VTT to SRT for universal players or VTT to ASS for styling.

Is VTT better than SRT?

For the web, yes, it is the HTML5 standard with positioning and styling. For universal compatibility beyond browsers, SRT still loads in more players.

Why does my VTT not show in the browser?

Check the WEBVTT header, dot-decimal timestamps (not commas), and that the <track> has kind="captions" plus a valid src.

Is the VTT format outdated?

No, it is the current web caption standard, required by the HTML5 video API.