How are multiline cues handled?

Physical cue line breaks become elements inside each TTML element.

Does the converter escape XML special characters?

Ampersands and angle brackets are escaped in text nodes so the generated document can be parsed as XML.

How does this differ from SRT to TTML conversion?

Both converters produce the same basic TTML structure. The VTT parser accepts WebVTT timing and ignores VTT-specific identifiers and settings, while the SRT parser works from numbered SRT blocks.

Can I edit the TTML file after conversion?

Yes. TTML is XML and can be edited in a text or XML editor. Validate the edited document before using it in a delivery workflow.

Is the VTT to TTML converter free?

Yes. It is free, requires no sign-up, adds no watermark, and accepts subtitle files up to 50 MB. Conversion runs locally in your browser.

Processing stays in your browser and the file is not uploaded to AllSubConverter. Browser storage, extensions, and enterprise device policies are controlled separately.

What language metadata is included?

The generated root element uses xml:lang="en". The converter does not detect source language or generate additional language metadata.

Can I batch convert multiple VTT files to TTML?

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

VTT to TTML Subtitle Converter

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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!

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>

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Supports .vtt files up to 50 MB

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How It Works

Upload VTT File

Drag & drop or select your .vtt file

Convert Instantly

We process it locally in your browser

Download TTML

Get your .ttml file immediately

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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.

About VTT to TTML

This browser-based converter reads timestamped WebVTT cue blocks and writes a basic UTF-8 TTML document. Cue start and end times become second-based begin and end attributes, physical line breaks become elements, and XML special characters are escaped. VTT cue identifiers, settings, regions, comments, and styling are not mapped to TTML presentation metadata.

Input Format

VTT

VTT (WebVTT) is a text subtitle format for web video. A VTT file starts with a WEBVTT header and uses HH:MM:SS.mmm --> HH:MM:SS.mmm cue timing. It can also contain cue identifiers, cue settings, inline tags, NOTE blocks, regions, and style metadata.

Output Format

TTML

TTML (Timed Text Markup Language) is a W3C XML subtitle format. This converter generates a basic UTF-8 document with a default TTML namespace, xml:lang="en", body and div elements, and one element per cue with second-based begin and end attributes.

Features

Reads timestamped WebVTT cue blocks directly in your browser

Writes a basic UTF-8 TTML XML document

Converts timing to second-based begin and end attributes

Converts cue line breaks to elements

Escapes ampersands and angle brackets in text nodes

Processes files up to 50 MB without uploading them

Why Convert?

TTML stores cues as structured XML rather than WebVTT text blocks.

Some streaming, broadcast, and localization tools accept TTML input.

A basic TTML draft can be extended with profile metadata in an XML editor.

XML tools can validate and transform the timed text.

Converting locally avoids uploading program material or caption text.

Keeping VTT and TTML copies supports different delivery environments.

Format Differences

VTT starts with a WEBVTT header; this TTML output starts with an XML declaration and <tt> root.

VTT uses HH:MM:SS.mmm cue timing; this output uses second-based begin and end attributes.

VTT cue settings and regions are discarded rather than mapped to TTML layout metadata.

VTT inline tags are escaped as literal text rather than becoming TTML spans.

VTT comments and identifiers are not carried over.

The output contains a basic TTML body without styling or profile metadata.

Common Use Cases

Basic TTML Draft

Create a basic TTML document from web subtitles before checking it against a target profile or workflow.

XML Interchange

Move timestamped VTT cues into a tool that accepts TTML XML input.

Text Editing

Use XML-aware tools to inspect or edit cue timing and text.

Local Conversion

Convert subtitles without uploading them to a separate conversion service.

Web and TTML Copies

Keep a VTT version for web playback while producing a basic TTML copy for another workflow.

Related Formats

SRT

A simpler timestamped subtitle format that is widely supported by media players.

VTT

The readable web-video input format used by this converter.

ASS

A styled subtitle format for players and workflows that need detailed presentation controls.

Frequently Asked Questions

Does the converter map VTT styling to TTML?

No. VTT cue settings, regions, CSS, and inline styling tags are not mapped to TTML styling or layout attributes. Tags inside cue text are escaped and remain literal text.

What happens to VTT voice tags?

Voice tags are not converted to TTML spans. Their angle brackets are escaped, so the source markup appears as literal text in the generated element.

Does the output include styling or layout metadata?

No. The generated TTML contains the XML declaration, default namespace, xml:lang="en", body, div, and timed elements. It does not include head, styling, region, IMSC, ITV, or EBU-TT-D metadata.

How are VTT timestamps converted?

Each cue start and end is written as a three-decimal second value, such as begin="1.500s" and end="4.000s".

Are VTT NOTE comments preserved?

No. NOTE blocks do not contain displayable cue text for this converter and are ignored.

Does this produce Netflix, Apple, or EBU delivery files?

Not by itself. Platform profiles often require additional namespaces, metadata, styling constraints, and validation. Use this basic TTML as a starting point only and check the recipient specification.

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Related Resources

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