What is MIME type "text/vtt"?

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

text/vtt is the MIME type for files in the Web Video Text Tracks format. It holds timed text cues used in video playback. Files like VTT add captions and subtitles to online videos.

The format embeds time codes that sync text with video frames. It is plain text and easy to edit. Modern browsers support it through HTML5’s track element.

Displays subtitles and captions during video playback
Synchronizes text using time codes
Supports styling for improved readability
Provides metadata such as chapter markers

For more details, see the WebVTT specification.

Associated file extensions

.vtt

Usage Examples

HTTP Header

When serving content with this MIME type, set the Content-Type header:


    Content-Type: text/vtt

HTML

In HTML, you can specify the MIME type in various elements:


    <a href="file.dat" type="text/vtt">Download file</a>

Server-side (Node.js)

Setting the Content-Type header in Node.js:


    const http = require('http');
    
    http.createServer((req, res) => {
      res.setHeader('Content-Type', 'text/vtt');
      res.end('Content here');
    }).listen(3000);

Associated file extensions

.vtt

FAQ

What is a MIME type?

A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.

MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.

MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.

How do I find the MIME type for a file?

You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.

Why are multiple MIME types listed for one extension?

Different applications and historical conventions may use alternative MIME identifiers for the same kind of file. Showing them all helps ensure compatibility across systems.