SSA to VTT Subtitle Converter

Quickly convert SubStation Alpha subtitles to WebVTT locally in your browser. Timelines and subtitle content are never uploaded.

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What happens when converting SSA to VTT?

SubStation Alpha content is parsed into a unified millisecond timeline before being exported as WebVTT. Valid timing and subtitle text are preserved.

WebVTT output uses dot-separated millisecond timestamps and includes the WEBVTT file header.

Complex ASS / SSA style tags and positioning are removed while visible text and timing are converted.

Format overview

About SSA and VTT 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

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.

Target 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.