Does the output include language metadata?

The generated root element uses xml:lang="en" by default. The converter does not infer another language from the SRT file.

Can I add styling to the TTML output?

Yes. You can edit the XML afterward with a text editor or subtitle tool to add the styles, regions, and profile metadata required by your destination.

Is the output ready for Netflix or Apple delivery?

No automatic delivery guarantee is provided. Use it as a timing and text starting point, then validate against the current IMSC, ITT, or platform specification before delivery.

Are timestamps frame-accurate after conversion?

The output preserves millisecond precision in second expressions. It does not convert timing to frame-based TTML expressions.

Is this converter free?

Yes, completely free with no sign-up, no watermarks, and files up to 50 MB each. All processing happens in your browser.

Can I batch convert multiple SRT files to TTML?

Yes. Drop several SRT files on this page and they open together in the workspace Batch tool with the TTML format pre-selected, converting every file at once. For larger jobs, use the Batch Converter page.

Is my subtitle data private?

All conversion happens client-side in your browser. No subtitle data is uploaded to a server, and the downloaded file remains on your device.

What file extension does the output use?

The converter outputs a .ttml file. Rename it only when your destination workflow explicitly requires another extension or profile-specific file type.

What happens to overlapping or negative timestamps?

Each cue is converted independently. Check any negative SRT timing before conversion because professional TTML workflows normally expect non-negative begin times.

SRT to TTML Subtitle Converter

Fast. Private. Perfect.

100% local processing in your browser. No upload. No waiting.

Private & Secure

Blazing Fast

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SRT

1
00:00:01,000 --> 00:00:04,000
Hello, world!
 
2
00:00:04,500 --> 00:00:08,000
This is a subtitle file.
 
3
00:00:08,500 --> 00:00:12,000
Converted locally!

TTML

<?xml version="1.0" encoding="UTF-8"?>
<tt xml:lang="en" xmlns="http://www.w3.org/ns/ttml">
  <body>
    <div>
      <p begin="1.000s" end="4.000s">Hello, world!</p>
      <p begin="4.500s" end="8.000s">This is a subtitle file.</p>
      <p begin="8.500s" end="12.000s">Converted locally!</p>
    </div>
  </body>
</tt>

Drag & drop your SRT file here

or click to browse

Supports .srt files up to 50 MB

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How It Works

Upload SRT File

Drag & drop or select your .srt file

Convert Instantly

We process it locally in your browser

Download TTML

Get your .ttml file immediately

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Why Choose AllSubConverter?

Your Privacy Matters

Everything runs in your browser. Your files are never uploaded.

Lightning Fast

Optimized processing engine converts files in seconds.

Free & Local

Each file can be up to 50 MB. Batches can contain up to 200 files or 1 GB total.

Works Everywhere

Works on Windows, Mac, Linux, iOS, Android - any modern browser.

About SRT to TTML

This converter transforms SubRip (SRT) subtitles into a basic Timed Text Markup Language (TTML) XML document. Cue timing is written as begin and end expressions in seconds, line breaks become tags, and XML special characters are escaped. Processing runs entirely in your browser.

Input Format

SRT

SRT (SubRip) is a plain-text subtitle format using sequential numbered entries with HH:MM:SS,mmm timestamps. Each cue contains a start time, an end time, and one or more lines of text.

Output Format

TTML

TTML is a W3C XML subtitle format. This converter writes a basic UTF-8 document with a <tt> root, xml:lang="en", <body>, <div>, and timed elements. The broader TTML family supports styling, regions, and delivery profiles, but those profile-specific features are not generated automatically.

Features

Converts SRT millisecond timestamps to TTML begin/end expressions such as 1.500s

Writes a well-formed TTML XML document with body and div containers

Converts cue line breaks to tags

Escapes ampersand and angle bracket characters for XML safety

Keeps conversion local to your browser with no uploads

Free with no sign-up, no watermarks, and files up to 50 MB each

Why Convert?

TTML is requested by many professional streaming and broadcast workflows.

XML makes timed text easier to validate and integrate into automated pipelines.

TTML is the basis of profiles such as IMSC and ITT used for international delivery.

Basic TTML can serve as a starting point when a platform does not accept plain SRT.

Format Differences

SRT is a numbered plain-text format; TTML is an XML document with timed elements.

SRT uses HH:MM:SS,mmm timestamps; this output uses TTML second expressions such as 1.500s.

SRT stores literal line breaks; this output represents them with tags.

TTML supports styling and metadata in its broader specification, but this converter writes basic timing and text only.

Common Use Cases

Professional Interchange

Move SRT content into a structured timed-text format for tools and workflows that accept TTML.

Streaming Preparation

Create basic TTML timing and text, then add the platform-specific profile metadata and validation your delivery workflow requires.

XML-Based Workflows

Use TTML when your pipeline prefers XML input over numbered plain-text subtitle cues.

Multi-Format Delivery

Keep SRT for broad compatibility and create TTML for an XML-based professional workflow.

Related Formats

VTT

WebVTT, the common choice for HTML5 video and browser playback.

SRT

SubRip, the widely supported plain-text interchange format used as the input here.

ASS

Advanced SubStation Alpha, a styled subtitle format used for advanced presentation and karaoke.

Frequently Asked Questions

What kind of TTML does this converter create?

It creates a basic UTF-8 TTML XML document with timed elements. It does not automatically generate Netflix IMSC/ITT, Apple ITV, or EBU-TT-D delivery-profile metadata.

Does the output include XML namespaces?

The output uses the default TTML namespace on the <tt> element. It does not declare optional metadata, styling, or profile namespaces because the converter does not generate those features.

Does the converter escape XML special characters?

Yes. Ampersand and angle bracket characters are escaped so the generated XML remains parseable. Quotes do not require escaping in text nodes.

How are SRT timestamps converted?

SRT HH:MM:SS,mmm timing is converted to TTML second expressions. For example, 00:01:30,500 becomes a begin value of 90.500s.

How are multi-line cues handled?

Each cue becomes one element. Line breaks inside the SRT cue are represented by tags.

What happens to non-standard SRT tags like or ?

HTML-like tags are escaped and appear as literal text in the TTML output. They are not converted to TTML styling elements.

Ready to convert your subtitles?

Drop your SRT file here and convert to TTML instantly.

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