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VTT to SSA Subtitle Converter
Quickly convert WebVTT subtitles to SubStation Alpha locally in your browser. Timelines and subtitle content are never uploaded.
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What happens when converting VTT to SSA?
WebVTT content is parsed into a unified millisecond timeline before being exported as SubStation Alpha. Valid timing and subtitle text are preserved.
SSA output uses a compatible SSA v4 default style while preserving subtitle text and timing.
Empty subtitles are removed and valid cues are sorted by start and end time.
Format overview
About VTT and SSA subtitle formats
Learn what each file format is, how it is structured, where it is commonly used, and what to consider during conversion.
Source file format
VTT · WebVTT
VTT, or WebVTT, is a timed-text format designed for web video. HTML5 video elements can use it through track elements for subtitles, captions, chapters, and other synchronized text.
- File structure
- A WebVTT file normally begins with a WEBVTT header and uses a dot as the millisecond separator. It may also contain cue identifiers, positioning settings, comments, and metadata.
- Common uses
- VTT is commonly used by web players, online courses, recorded streams, accessible closed captions, and videos that need subtitles displayed directly by modern browsers.
- Conversion notes
- VTT supports richer web-caption features than SRT. Cue positioning, voice tags, chapters, and some metadata may not survive conversion to simpler formats.
Target file format
SSA · SubStation Alpha
SSA, or SubStation Alpha, is a classic advanced subtitle format and the predecessor of ASS. It supports styling, positioning, and effects, with SubStation Alpha v4 being a common version.
- File structure
- SSA files use sections such as Script Info, V4 Styles, and Events. Subtitle events are normally stored in Dialogue lines, and classic v4 files commonly include a Marked field.
- Common uses
- SSA is often found in older subtitle-authoring software, legacy subtitle archives, early anime subtitle projects, and players that still support SubStation Alpha.
- Conversion notes
- SSA and ASS are related but not identical. Text and timing can be preserved when converting to simpler subtitle formats, while complex styles and effects normally cannot.