EBU STL to TTML Converter

Convert EBU STL to TTML

Converting from Spruce STL (STL) to TTML (TTML) while maintaining timing accuracy and subtitle content.

About EBU STL to TTML Conversion

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

Key Differences Between EBU STL and TTML

Format Structure: EBU STL uses a professional broadcast format with header metadata while TTML uses an XML-based format with styling and layout sections
Styling Support: EBU STL includes broadcast-standard formatting while TTML supports comprehensive XML-based styling
Software Compatibility: EBU STL is primarily used with undefined, undefined, undefined, while TTML is commonly used with undefined, undefined, undefined
Use Cases: EBU STL is typically used for broadcast television, while TTML is preferred for professional streaming platforms

Format Structure Examples

EBU STL Format Example

//EBU STL Subtitle File
$FontName       = Arial
$FontSize       = 30
$ColorIndex     = 1
$TapeNumber     = 1
$PageNumber     = 1
$TotalPages     = 1
$MaxRows        = 11
$TimeCodeFormat = 1

00:00:01:00,00:00:04:00
First line of subtitle text
Second line of subtitle text

00:00:05:00,00:00:08:00
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

Text content and formatting
Timing accuracy
Basic styling information
Language codes
Essential metadata

What's Lost in Conversion

Teletext-specific features
Some broadcast metadata
EBU-specific timing information

Compatible Software

EBU STL can be opened with:

TTML can be opened with:

Conversion Features with Checksub

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

Convert Your EBU STL File Now

Ready to convert your subtitles? Our converter maintains timing accuracy and proper formatting while ensuring the best possible compatibility with your target platform.

Convert to TTML