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Convert WebVTT to TTML

Convert WebVTT to TTML

/vtt-to-ttml

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About WebVTT to TTML Conversion

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

    Key Differences Between WebVTT and TTML

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

Format Structure Examples

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

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>

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

  • No features are lost in this conversion. The target format supports all capabilities of the source format.

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Compatible Software

TTML can be opened with:

Conversion Features with Checksub

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

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