TTML to WebVTT Converter

Convert TTML to WebVTT

Converting from TTML to WebVTT adapts broadcast subtitles for web playback.

About TTML to WebVTT Conversion

A quick guide to converting from TTML (.ttml) to WebVTT (.vtt). Learn about format differences, what's preserved, and how to convert your subtitles.

Key Differences Between TTML and WebVTT

Format Structure: TTML uses an XML-based format with styling and layout sections while WebVTT uses a web-optimized format with header and cues
Styling Support: TTML supports comprehensive XML-based styling while WebVTT supports CSS-style formatting and positioning
Software Compatibility: TTML is primarily used with undefined, undefined, undefined, while WebVTT is commonly used with Google Chrome, Mozilla Firefox, Safari
Use Cases: TTML is typically used for professional streaming platforms, while WebVTT is preferred for web-based video platforms

Format Structure Examples

TTML Format Example

<?xml version="1.0" encoding="utf-8"?>
<tt xmlns="http://www.w3.org/ns/ttml" 
    xmlns:ttp="http://www.w3.org/ns/ttml#parameter" 
    xmlns:tts="http://www.w3.org/ns/ttml#styling" 
    xmlns:ttm="http://www.w3.org/ns/ttml#metadata" 
    xmlns:xml="http://www.w3.org/XML/1998/namespace" 
    ttp:timeBase="media" 
    ttp:frameRate="24" 
    xml:lang="en">
  <head>
    <metadata>
      <ttm:title>Sample TTML</ttm:title>
    </metadata>
    <styling>
      <style xml:id="s1" 
             tts:textAlign="center" 
             tts:fontFamily="Arial" 
             tts:fontSize="100%"/>
    </styling>
    <layout>
      <region xml:id="bottom" 
              tts:displayAlign="after" 
              tts:extent="80% 40%" 
              tts:origin="10% 50%"/>
      <region xml:id="top" 
              tts:displayAlign="before" 
              tts:extent="80% 40%" 
              tts:origin="10% 10%"/>
    </layout>
  </head>
  <body>
    <div>
      <p xml:id="subtitle1" begin="00:00:01.375" end="00:00:05.750" 
         style="s1" region="top">TOP SAMPLE TEXT</p>
      <p xml:id="subtitle2" begin="00:00:05.916" end="00:00:10.216" 
         style="s1" region="bottom">BOTTOM SAMPLE TEXT</p>
      <p xml:id="subtitle3" begin="00:00:10.418" end="00:00:15.083" 
         style="s1" region="bottom">He had a great story.</p>
      <p xml:id="subtitle4" begin="00:00:15.391" end="00:00:20.558" 
         style="s1" region="bottom">- Did he tell you what it was about?<br/>- He did</p>
      <p xml:id="subtitle5" begin="00:00:20.750" end="00:00:25.041" 
         style="s1" region="bottom">In 1992, a shipping container<br/>fell overboard</p>
    </div>
  </body>
</tt>

WebVTT Format Example

WEBVTT

00:00:01.000 --> 00:00:04.000
First line of subtitle text
Second line of subtitle text

00:00:05.000 --> 00:00:08.000
Next subtitle block

What's Preserved in Conversion

Timing information and synchronization
Text content and line breaks
Basic text formatting
Character encoding
Language identification

What's Lost in Conversion

Web-specific styling features
CSS styling capabilities
Chapter and metadata markers

Compatible Software

TTML can be opened with:

WebVTT can be opened with:

Conversion Features with Checksub

Automatic TTML format detection
Precise timing conversion from TTML to WebVTT
Smart text formatting adaptation
Character encoding handling (UTF-8, Unicode)
Format-specific optimizations for WebVTT
Error checking and validation

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