Is the TTML to VTT converter free?

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

Is my data sent to a server?

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

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 VTT 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 VTT Subtitle Converter

Fast. Private. Perfect.

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

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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>

VTT

WEBVTT
 
00:00:01.000 --> 00:00:04.000
Hello, world!
 
00:00:04.500 --> 00:00:08.000
This is a subtitle file.
 
00:00:08.500 --> 00:00:12.000
Converted locally!

Drag & drop your TTML file here

or click to browse

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

100% LocalNo UploadSecureInstant

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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 VTT

Get your .vtt 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.

Free Online TTML to VTT Converter

This converter reads cues from a TTML document and writes basic WebVTT output. The file starts with a WEBVTT header, each cue receives dot-separated start and end timestamps, elements become line breaks, and common inline formatting tags are removed. No cue settings or styling metadata are generated.

Input Format

TTML

TTML (Timed Text Markup Language) is an XML subtitle format. This converter looks for 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

VTT

VTT (WebVTT) is a text subtitle format used with web video. This converter emits the WEBVTT header followed by plain cues with HH:MM:SS.mmm --> HH:MM:SS.mmm timing and text. It does not add cue identifiers, cue settings, regions, styling, or metadata blocks.

Features

Reads TTML cues with begin/end or begin/dur timing

Adds the WEBVTT header required by the format

Writes dot-separated VTT start and end timestamps

Turns elements into normal VTT line breaks

Decodes XML entities and removes common inline tags

Processes files locally in your browser

Why Convert?

Web video workflows commonly use VTT rather than timed-text XML.

VTT is a simple plain-text format that is easy to inspect and edit.

The conversion keeps cue text, line breaks, and start/end timing.

Browser-side processing avoids uploading the subtitle file.

Format Differences

TTML stores cues in XML elements; VTT uses text cue blocks.

TTML uses begin, end, and dur attributes; VTT uses timestamp lines.

TTML supports XML styling, regions, and metadata; this output does not include VTT equivalents.

TTML elements become physical VTT text lines.

Common Use Cases

Web Video Preparation

Convert supported TTML cues into a basic VTT file for web-video testing and editing.

Simplified Cue Review

Inspect timing and text without TTML XML structure.

Format Interchange

Move recognized TTML cues into a web-oriented subtitle format.

Related Formats

SRT (SubRip)

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

ASS (Advanced SubStation Alpha)

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

TXT (Plain Text)

Convert TTML to TXT when timing is not required.

Frequently Asked Questions

Does the output preserve TTML positioning?

No. The generated VTT contains basic cues with timing and text only. Cue settings for position, alignment, size, and regions are not generated.

How are TTML durations handled?

If end is present, it is used. Otherwise dur is added to begin. If neither is present, the converter uses a three-second fallback duration.

Does the converter support every TTML profile?

It reads basic TTML cues with supported timing syntax. Delivery profiles can add structures and timing expressions that this converter does not fully support.

Does the output preserve TTML styling?

No. Common inline TTML formatting tags are removed and no VTT styling tags are generated.

How are line breaks handled?

TTML elements become normal text line breaks in the VTT cue.

Are multi-language TTML documents separated automatically?

No. The converter extracts recognized cues in document order. Separate language tracks before conversion if your source contains multiple languages.

Ready to convert your subtitles?

Drop your TTML file here and convert to VTT instantly.

Related Resources

What is TTML?What is VTT?VTT vs TTML ASS vs TTML SRT vs TTML SRT vs VTT