What is MIME type "application/x-subrip"?

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

application/x-subrip is the MIME type for the SubRip subtitle format.
It indicates plain text files that hold time-coded subtitles. These files contain text lines and timing data that instruct video players when to show each subtitle.

Main use case: Displaying subtitles during video playback.
Other uses: Editing and translating subtitle content, and providing accessibility options.
Typical association: Files using the SRT extension.

The format is simple and human-readable. It uses basic timing (start and end times) to sync text with video.
Many media players and subtitle editors support this MIME type because it is easy to create and modify.
Learn more about the format on Wikipedia.

Associated file extensions

.srt

Usage Examples

HTTP Header

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


    Content-Type: application/x-subrip

HTML

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


    <a href="file.dat" type="application/x-subrip">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', 'application/x-subrip');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.srt

FAQs

How do I configure Apache or Nginx to serve .srt files correctly?

To ensure browsers and players recognize the file type, you must update your server configuration. For Apache, add AddType application/x-subrip .srt to your .htaccess or config file. For Nginx, add application/x-subrip srt; inside the types block within mime.types or nginx.conf.

Can I use application/x-subrip directly in the HTML5 <track> element?

Generally, no. The HTML5 <track> element standard requires the WebVTT format (text/vtt). While SRT is structurally similar, you typically need to convert your SRT files to WebVTT or use a JavaScript-based video player (like Video.js) that can parse application/x-subrip on the fly.

Is application/x-subrip a binary file format?

No, it indicates a plain text file. You can open, read, and edit these files using any standard text editor (like Notepad or VS Code) to adjust timestamps or correct typos without special software.

What is the difference between application/x-subrip and text/vtt?

application/x-subrip corresponds to the SRT format, which is simple and widely supported by desktop media players. text/vtt corresponds to WebVTT, which is the modern standard for web browsers, offering advanced features like styling, positioning, and metadata.

Why do some servers serve .srt files as text/plain?

If a server lacks a specific MIME definition for the .srt extension, it often defaults to text/plain. While this allows the file to be read as text, it may prevent some strict video players or browser scripts from automatically recognizing it as a subtitle track.

Are there security risks associated with application/x-subrip files?

Since these are text files, they cannot execute code directly. However, vulnerabilities have existed in specific media players (like VLC or Kodi) where a malformed SRT file could cause a crash or exploit a buffer overflow. Always keep your media player software updated.

General 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.