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SubStation Alpha , abbreviated SSA, is a subtitle file format created by CS Low that allows for more advanced subtitles than the conventional SRT and similar formats. It is also the name of the popular, now discontinued tool used to edit subtitles.

This subtitle format is frequently used in anime fansubs, either to overlay subtitles onto video while it is being encoded , or to store subtitle data alongside video data, often in a Matroska container. It's not commonly used professionally except by Crunchyroll.

The current version of SSA is v4.00. There are many freeware and open source subtitling applications that support the SSA format.

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