ASS to SSA Subtitle Converter

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

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What happens when converting ASS to SSA?

Advanced SubStation Alpha 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.

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

Format overview

About ASS 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

ASS · Advanced SubStation Alpha

ASS, or Advanced SubStation Alpha, is an enhanced successor to SSA. It can precisely control subtitle fonts, colors, positions, animation, and karaoke effects.

File structure: ASS files are organized into sections such as Script Info, V4+ Styles, and Events. Subtitle cues are usually stored as Dialogue lines that reference predefined styles.
Common uses: ASS is commonly used for anime subtitles, visual subtitle effects, complex typesetting, karaoke, and video workflows that require precise presentation control.
Conversion notes: ASS can express much more styling than SRT, LRC, or TXT. When converting to a simpler format, this tool preserves visible text and timing but not complex styling, positioning, or animation.

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.