ASS → TTML
Convert ASS to TTML
Free in-browser converter from Advanced SubStation Alpha (ASS / SSA) to Timed Text Markup Language (TTML / DFXP). No signup, no upload — runs entirely on your device.
- Nothing is uploaded
- Timestamps preserved
- No account needed
1 cues in
1 cues out · 414 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 ASS / SSA → TTML → ASS / SSA 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 → ASS / SSA) is one click away — no need to bookmark a different page.
About these formats
ASS
ASS (and its predecessor SSA) was designed for typesetting-quality subtitles in the anime fansub community. Each cue can specify font, size, primary/secondary/outline/shadow colours, alignment, layer, position, and per-syllable karaoke highlighting via {\k} tags. It is the only subtitle format that can express broadcast-grade typography and complex on-screen effects.
Full ASS 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
What changes in this conversion
TTML has nowhere to put the following, so it is dropped:
- Styling & positioning — Named styles, layers and on-screen placement carried in the file itself.
Timing survives intact. TTML records milliseconds where ASS records centiseconds, so nothing is rounded away.
Questions
How do I convert ASS to TTML?
Paste your ASS 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 ASS into TTML with millisecond precision.
What if my ASS 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.