VTT → TTML

Convert VTT to TTML

Free in-browser converter from WebVTT (Web Video Text Tracks) to Timed Text Markup Language (TTML / DFXP). No signup, no upload — runs entirely on your device.

Nothing is uploaded
Timestamps preserved
No account needed

Convert TTML to VTT instead

Paste or open your VTT

2 cues in

TTML output

<?xml version="1.0" encoding="UTF-8"?>
<tt xml:lang="en" xmlns="http://www.w3.org/ns/ttml" xmlns:tts="http://www.w3.org/ns/ttml#styling">
  <head>
    <styling>
      <style xml:id="defaultStyle" tts:color="white" tts:fontSize="100%" tts:textAlign="center"/>
    </styling>
  </head>
  <body>
    <div>
      <p begin="00:00:12.340" end="00:00:18.910" xml:id="s1">First caption line</p>
      <p begin="00:00:18.920" end="00:00:24.500" xml:id="s2">Second caption line</p>
    </div>
  </body>
</tt>

2 cues out · 498 B

How this converter behaves

100% in your browser

We never see your file. Conversion runs as JavaScript in the page you're reading.

Round-trip safe

Convert WebVTT → TTML → WebVTT and you should get the same content back, line-for-line.

Spec-compliant output

TTML files validate against the TTML reference parsers.

Bidirectional

Reverse direction (TTML → WebVTT) is one click away — no need to bookmark a different page.

About these formats

VTT

WebVTT is the official W3C standard for HTML5 <track> elements. It looks similar to SRT but uses a `WEBVTT` header, periods (not commas) as decimal separators, and supports cue settings (position, alignment, line), regions, NOTE comments, and styling via inline ::cue rules. This is the format YouTube, Vimeo, JW Player and every browser-based player consume internally.

Full VTT guide →

TTML

TTML is a W3C XML standard for timed text. It supports rich styling, regions, animations and accessibility metadata, and is the format Apple Music ships synchronised lyrics in (TTML 2 with Apple's iTunesTimedText profile). It also underpins SMPTE-TT for broadcast captions and is exported by professional subtitling suites such as EZTitles, Subtitle Edit and FAB.

Full TTML guide →

What survives the conversion

Questions

How do I convert VTT to TTML?

Paste your VTT into the input box, or open a file from your device. The converter runs in your browser and produces TTML instantly. Click Download to save it.

Is this free?

Yes — no signup, no credits, no upload. Conversion happens entirely on your device, so the file never leaves your browser.

Are timestamps preserved?

Yes. Timestamps round-trip from VTT into TTML with millisecond precision.

What if my VTT has styling or positioning?

Only what both formats can express survives a conversion. TTML keeps the timings and the text; formatting that TTML has no equivalent for is dropped rather than approximated.

Other conversions

VTT → LRC VTT → SRT VTT → ASS TTML → VTT