VTT → ASS
Convert VTT to ASS
Free in-browser converter from WebVTT (Web Video Text Tracks) to Advanced SubStation Alpha (ASS / SSA). No signup, no upload — runs entirely on your device.
- Nothing is uploaded
- Timestamps preserved
- No account needed
2 cues in
2 cues out · 649 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 → ASS / SSA → WebVTT and you should get the same content back, line-for-line.
Spec-compliant output
ASS / SSA files validate against the ASS / SSA reference parsers.
Bidirectional
Reverse direction (ASS / SSA → 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 →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 →What survives the conversion
What changes in this conversion
ASS has nowhere to put the following, so it is dropped:
- Cue identifiers — A handle for each cue, useful when diffing or re-syncing.
Questions
How do I convert VTT to ASS?
Paste your VTT into the input box, or open a file from your device. The converter runs in your browser and produces ASS 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 ASS with millisecond precision.
What if my VTT has styling or positioning?
Only what both formats can express survives a conversion. ASS keeps the timings and the text; formatting that ASS has no equivalent for is dropped rather than approximated.