What happens to cues without begin attributes?

They are skipped because the converter cannot determine their start time.

Can I batch convert TTML files?

Drop several valid files on this page and they open together in the workspace Batch tool with STL preselected. The batch workflow supports up to 200 files.

What is the maximum file size?

Each subtitle file can be up to 50 MB.

TTML to STL Subtitle Converter

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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>

STL

// Spruce Subtitle File
// Format: Start Time, End Time, Subtitle Text
 
00:00:01:00 , 00:00:04:00 , Hello, world!
00:00:04:15 , 00:00:08:00 , This is a subtitle file.
00:00:08:15 , 00:00:12:00 , Converted locally!

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Supports .ttml, .itt, .xml files up to 50 MB

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How It Works

Upload TTML File

Drag & drop or select your .ttml file

Convert Instantly

We process it locally in your browser

Download STL

Get your .stl file immediately

More Conversions You Might Need

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SRT STL VTT STL ASS STL LRC STL SBV STL SSA STL SCC STL SMI STL

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.

Free Online TTML to STL Converter

This converter reads <p> cues from a TTML document and writes text-based Spruce STL output. Timing is quantized to a 29.97 fps frame grid, line breaks become vertical-bar separators, and common inline TTML tags are removed. Each output cue contains a start time, end time, and text.

Input Format

TTML

TTML (Timed Text Markup Language) is an XML subtitle format. This converter looks for <p> elements with begin and end, or begin and dur, timing attributes, and accepts second-based or clock-valued timing. Cues without a begin attribute are skipped.

Output Format

STL

This output is text-based Spruce STL, not binary EBU STL. The file includes generator comments followed by start time, end time, and text entries. Timing uses SMPTE-style HH:MM:SS:FF values at 29.97 fps, and display line breaks are represented with vertical bars.

Features

Reads TTML <p> cues with begin/end or begin/dur timing

Writes text-based Spruce STL entries

Quantizes timing to a 29.97 fps frame grid

Converts cue line breaks to vertical-bar separators

Removes common inline TTML formatting tags

Processes files locally in your browser

Why Convert?

STL text entries are compact and easy to inspect as plain text.

The conversion preserves explicit start and end times.

Vertical-bar separators provide a simple line-break representation for STL text.

A Spruce-style text file can be useful when a workflow expects this layout.

Format Differences

TTML is XML; this STL output is a plain-text cue list.

TTML timing attributes are converted to frame-based SMPTE-style timecodes.

TTML <br/> elements become vertical-bar STL separators.

TTML styling and metadata are not mapped to the STL output.

Common Use Cases

Text STL Preparation

Create text-based Spruce-style STL entries from supported TTML cues.

Line-Break Conversion

Convert TTML line breaks into STL vertical-bar separators.

Timing Conversion

Move begin and end values into frame-grid SMPTE-style timecodes.

Related Formats

SRT (SubRip)

Convert TTML to SRT for a widely supported plain-text subtitle format.

VTT (WebVTT)

Convert TTML to VTT for a basic web-video cue format.

ASS (Advanced SubStation Alpha)

Convert TTML to ASS when you want to continue styling work in an ASS editor.

Frequently Asked Questions

Does this create EBU STL?

No. The output is text-based Spruce STL with start, end, and text entries. Binary EBU STL is not generated.

What timing precision does the output use?

Times are quantized to a 29.97 fps SMPTE-style frame grid. TTML millisecond precision may be adjusted to the nearest supported frame representation.

Is the TTML to STL converter free?

Yes. There is no registration or watermark, and conversion happens in your browser.

How are line breaks represented?

TTML line breaks are written as vertical-bar separators in the STL text field.

Does the converter preserve TTML styling?

No. Common inline tags are removed and no TTML styling or metadata is mapped.

Is my data sent to a server?

No. Processing stays in your browser and the subtitle file is not uploaded.

Ready to convert your subtitles?

Drop your TTML file here and convert to STL instantly.

Related Resources

What is TTML?What is STL?TTML vs STL ASS vs STL ASS vs TTML LRC vs STL