How are TTML regions handled?

TTML elements in the document head are converted to VTT REGION blocks where applicable. Basic positioning regions are preserved; complex multi-region layouts may be simplified to VTT's more limited region system.

Is the TTML to VTT converter free?

Yes, completely free with no sign-up, no watermarks, and no file size limits. All processing happens in your browser.

Can I use the output VTT file on YouTube?

Yes. YouTube accepts VTT files for subtitle uploads through its creator studio. The VTT output from this converter is compatible with YouTube's subtitle upload requirements.

How are tags handled in the output?

TTML tags for line breaks are converted to plain-text newlines in VTT cues, which is how VTT represents multi-line subtitle text. The visual line break structure is preserved.

What about XML special characters in the text?

TTML escapes special characters as XML entities (&, <, >). The converter unescapes these back to their readable characters in the VTT output, since VTT uses plain text rather than XML encoding.

Can I convert TTML to VTT for HTML5 elements?

Yes. The output VTT file is fully compatible with HTML5 elements. You can embed it in any web video player using .

Does the converter handle multi-language TTML files?

TTML can contain multiple language tracks. The converter extracts all text from elements. If your TTML has multiple languages in separate sections, you may want to process them individually for separate VTT files per language.

What file extensions does the converter accept?

The converter accepts .ttml, .xml, and .itt files, as TTML content can use any of these extensions. The output is always a .vtt file.

Absolutely. All conversion happens client-side in your browser. No subtitle data, file contents, or metadata is ever transmitted to a server.

How does VTT compare to TTML for web video?

VTT is the native format for HTML5 web video and is supported by all modern browsers. TTML is primarily for authoring and professional delivery. For web playback, VTT is the right choice. For delivery to Netflix/Apple TV, TTML is required.

Can I edit the VTT file after conversion?

Yes. VTT files are plain text and can be edited in any text editor or subtitle editor. VTT is more human-readable than TTML since it does not require XML knowledge, while still supporting styling and positioning.

Can I batch convert multiple TTML files to VTT?

This page converts one file at a time. For batch processing, use the Workspace feature to load multiple TTML files and convert them sequentially through the pipeline.

What information is lost converting TTML to VTT?

Complex TTML features like forced narrative metadata flags, SDH role attributes, multi-region precise positioning, and advanced font styling may be simplified or lost. Basic timing, text, alignment, and positioning are preserved in the VTT output.

TTML to VTT 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>

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

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Supports .ttml files up to any size

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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

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Get your .vtt file immediately

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About TTML to VTT

This converter transforms TTML (Timed Text Markup Language) subtitle files into WebVTT format. TTML is the professional XML-based format used by Netflix, Apple TV, and broadcast systems, while VTT is the W3C standard for HTML5 web video subtitles. This conversion is ideal when you need to play professional subtitle files on websites, in browsers, or on platforms that support WebVTT but not TTML, while preserving more positioning information than a conversion to plain SRT would allow.

Input Format

TTML

TTML (Timed Text Markup Language) is a W3C XML-based subtitle format used by Netflix (IMSC/ITT), Apple TV (ITV), Amazon Prime Video, and broadcast organizations (EBU-TT-D). TTML files contain structured XML with namespaces, styling attributes, elements, begin/end time expressions, and metadata. They may use .ttml, .xml, or .itt extensions.

Output Format

VTT

VTT (WebVTT) is the W3C standard subtitle format for HTML5 video, supported natively by all modern browsers via the <track> element. VTT uses dot-separated timestamps (00:01:30.500), supports cue settings (position, align, line, size), voice tags, and is used by YouTube, Vimeo, Netflix web player, and streaming platforms.

Features

Converts TTML XML to valid WebVTT with proper WEBVTT header

Maps TTML begin/end attributes to VTT cue timestamps (already dot-separated)

Transfers TTML positioning (tts:origin, tts:extent) to VTT cue settings where possible

Converts TTML styling attributes to VTT inline styling tags

Strips XML namespaces, metadata, and complex structures cleanly

Converts tags to plain-text newlines in VTT cues

Handles TTML profiles including IMSC, ITV, and EBU-TT-D input variants

Client-side processing - no uploads, complete privacy

Why Convert?

HTML5 web video players require VTT (not TTML) for native subtitle display via the <track> element in all modern browsers.

YouTube accepts VTT for subtitle uploads but does not accept TTML through its standard creator interface.

VTT preserves more positioning and styling information from TTML than SRT conversion would, maintaining cue alignment and text positioning.

Modern smart TVs and streaming devices increasingly support VTT alongside SRT but may not support TTML directly.

VTT is the standard for web-based video platforms (Vimeo, Dailymotion, educational platforms) that do not accept TTML uploads.

Converting TTML to VTT rather than SRT preserves voice tags, cue settings, and basic styling that SRT would strip entirely.

Web developers building custom video players need VTT format for JavaScript-based subtitle handling, not XML-based TTML.

Format Differences

TTML is structured XML with namespaces, elements, and tts: attributes. VTT is a plain-text format with a WEBVTT header, timestamps, and optional cue settings.

TTML uses begin/end XML attributes (begin="00:01:30.500" end="00:01:35.000"). VTT uses a single timestamp line with arrow separator (00:01:30.500 --> 00:01:35.000).

TTML positioning uses tts:origin and tts:extent attributes on elements. VTT uses inline cue settings like position:50%, line:0, align:center on the timestamp line.

TTML styling is defined via tts: attributes (fontFamily, color, backgroundColor). VTT uses inline tags (, , <c>) and CSS-like cue settings.

TTML supports <region> elements in the document head. VTT uses REGION blocks before the cues for area definitions.

TTML supports metadata via ttm: namespace. VTT has no metadata system beyond cue settings and NOTE comments.

Common Use Cases

HTML5 Web Video

Convert TTML subtitles to VTT for use with HTML5 <track> elements in web video players. Browsers natively support VTT but not TTML for subtitle display.

YouTube Upload

YouTube accepts VTT subtitle uploads through its creator studio. Convert TTML subtitles to VTT before uploading to YouTube.

Preserving Positioning

When converting TTML for broader compatibility, VTT preserves more positioning and alignment than SRT. Choose TTML-to-VTT when cue positioning matters.

Modern Smart TV Playback

Modern smart TVs and streaming devices increasingly support VTT alongside SRT. Convert TTML to VTT for playback on these devices when SRT is too limited.

Web Developer Integration

Web developers building custom video players need VTT for JavaScript-based subtitle handling. Convert TTML subtitle assets to VTT for web application integration.

Related Formats

SRT

SubRip - convert TTML to SRT instead of VTT when you need maximum compatibility and do not care about positioning or styling.

VTT

WebVTT - the output format of this converter. The W3C standard for HTML5 video subtitles.

ASS

Advanced SubStation Alpha - convert TTML to ASS if you need advanced styling and positioning for professional captioning workflows.

Frequently Asked Questions

Why convert TTML to VTT instead of SRT?

VTT preserves more information from TTML than SRT would. VTT supports positioning, alignment, voice tags, and basic styling, which are all lost when converting to plain SRT. Choose VTT when you need web playback with some formatting preserved.

How are TTML timestamps converted to VTT?

TTML uses begin/end XML attributes with dot-separated time expressions (begin="00:01:30.500"). VTT uses the same dot-separated format but in a single timestamp line with an arrow: 00:01:30.500 --> 00:01:35.000. The conversion is direct with no precision loss.

What happens to TTML styling attributes?

TTML tts: styling attributes are mapped to VTT equivalents where possible. Font styles like italic become tags, bold becomes tags. Color styling is mapped to <c> class tags. Complex styling that VTT cannot represent is simplified.

Does the converter preserve TTML positioning?

Yes, where possible. TTML tts:origin, tts:extent, and tts:textAlign attributes are mapped to VTT cue settings (position, line, align). Some advanced TTML positioning features may be simplified, but basic alignment and position are preserved.

Does the output include a WEBVTT header?

Yes. Every valid VTT file must start with the WEBVTT header line. The converter prepends this automatically to the output, ensuring the file is recognized by all VTT-compatible players and browsers.

Does the converter handle Netflix IMSC files?

Yes. IMSC is a profile of TTML. The converter reads the underlying XML structure regardless of which TTML profile is used, extracting cues and converting them to VTT format.

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Related Resources

What is TTML?What is VTT?