Convert TTML to VTT Online Free

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Convert TTML broadcast and streaming subtitle files to WebVTT format for HTML5 video and web-based media players. ChangeThisFile extracts cues from TTML XML and outputs valid VTT.

By ChangeThisFile Team · Last updated: March 2026

Quick Answer

ChangeThisFile converts TTML to VTT on a secure server. Upload your TTML XML subtitle file and it is converted to WebVTT with a proper WEBVTT header and period-separated timestamps. Files are auto-deleted after conversion. Free with no signup required.

First daily conversion free No signup required Encrypted transfer · Async jobs kept up to 24h Queued when needed Updated May 2026

TTML vs VTT: Format Comparison

Key differences between the two formats

Feature	TTML	VTT
Standard	W3C TTML XML	W3C WebVTT
Structure	XML document tree	Plain text cue blocks
Styling	XML attributes (tts:*)	CSS STYLE blocks
HTML5 support	Via polyfills only	Native <track> element
Positioning	Named TTML regions	Cue settings per line
File size	Large XML	Compact text
Primary use	Broadcast/professional	Web video players

When to Convert

Common scenarios where this conversion is useful

Serving broadcast subtitles in an HTML5 video player

HTML5 video players use the <track> element which requires VTT. If you have TTML subtitle files from a broadcast source, converting to VTT enables immediate web playback.

Publishing streaming platform content on a website

When re-publishing content that originated from a TTML-based streaming platform on a website, converting to VTT makes the subtitles compatible with web video infrastructure.

Testing subtitle rendering in a browser

Browsers do not natively render TTML. Converting to VTT lets you test subtitle timing and content in any browser using the <track> element without additional libraries.

Who Uses This Conversion

Tailored guidance for different workflows

Video Editors & Subtitlers

Convert TTML caption files to VTT for the subtitle track your editor or delivery spec requires
Move TTML subtitles into VTT to hand off to an editor working in a different tool

After converting to VTT, confirm the cue timings still line up with the video

Check that line breaks and special characters survived the TTML to VTT conversion

Content Creators & YouTubers

Convert TTML captions to VTT to upload alongside your video on YouTube, Vimeo, or social platforms
Turn a TTML caption file into VTT to make your video clearer and more accessible

Keep individual VTT cues short (about one to two lines) so captions stay readable on screen

Preview the VTT captions on the actual video to catch any timing drift before publishing

Accessibility & Localization Teams

Convert TTML subtitles to VTT to meet the caption format an accessibility or compliance spec requires
Prepare TTML captions as VTT to hand to translators or a localization workflow

Speaker labels and on-screen positioning only carry over if VTT supports them, so spot-check the result

Validate the VTT file in a caption checker to catch overlapping cues or malformed timestamps

How to Convert TTML to VTT

1

Upload your TTML file

Drag and drop your TTML subtitle file onto the converter, or click browse. The upload is encrypted.
2

Server-side conversion

The server parses the TTML XML, extracts <p> cues with begin and end times, converts timestamps to VTT's period-millisecond format, and adds the WEBVTT header.
3

Download the VTT

Save your converted WebVTT file. The server copy is automatically deleted after processing.

Automate this conversion

Convert TTML to VTT via API

Integrate this conversion into your pipeline with 3 lines of code. Free tier: 25 conversions/month.

curl -X POST https://changethisfile.com/v1/convert \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -F "file=@input.ttml" \
  -F "target=vtt" \
  -o output.vtt --fail

const form = new FormData();
form.append('file', fileInput.files[0]);
form.append('target', 'vtt');

const res = await fetch('https://changethisfile.com/v1/convert', {
  method: 'POST',
  headers: { 'Authorization': 'Bearer YOUR_API_KEY' },
  body: form
});
const blob = await res.blob(); // your converted VTT file

Replace YOUR_API_KEY with your free key — no credit card needed.

Get a free API key

Frequently Asked Questions

Why convert TTML to VTT instead of SRT?

VTT is better suited for web video since it supports CSS styling, cue positioning, and native HTML5 integration. SRT is simpler but lacks web-native features. Choose VTT if you are targeting a web video player.

What TTML styling is preserved in the VTT output?

Basic TTML styling attributes are not automatically mapped to VTT CSS. The VTT output contains the cue text as plain text. You can add VTT STYLE blocks manually after conversion.

Does the converter support TTML files with multiple regions?

Multi-region TTML files are supported. Region placement is discarded in the VTT output since VTT uses a different positioning model.

Can the VTT output be used directly in a <track> element?

Yes. The converted VTT is W3C-compliant and can be used directly: <track kind="subtitles" src="subtitles.vtt" srclang="en">.

What TTML timestamp formats are supported?

The converter handles standard HH:MM:SS.mmm timestamps and frame-based HH:MM:SS:ff timecodes commonly used in broadcast TTML files.

Are my files deleted after conversion?

Yes. Files are transferred over HTTPS and deleted automatically after your VTT is ready.

Is there a file size limit?

TTML files can be larger due to XML overhead. The 50 MB server limit accommodates virtually any subtitle file.

Does the converter handle TTML with nested span elements?

The converter extracts text from <span> child elements within <p> elements. Nested span text is concatenated with spaces into a single cue.

Can I convert VTT back to TTML?

Yes. ChangeThisFile supports VTT to TTML conversion for round-trip workflows.

What about DFXP? Is it the same as TTML?

DFXP (Distribution Format Exchange Profile) is an earlier version of TTML. They share the same XML structure. ChangeThisFile also supports DFXP to SRT and SRT to DFXP conversion.

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