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ASS
What is an ASS file?
Subtitles with positioning, fonts and effects. Standard in anime fansubbing.
What ASS is
ASS is a plain-text format you can open in any editor. It is used for subtitling.
The extension is .ass, and the full name is Advanced SubStation Alpha. Both matter less than what the file can hold, which is what the rest of this page is about.
Where ASS came from
It dates from 2002.
Age is worth knowing here for one practical reason: the older a format is, the more programs have had time to learn it.
The specification is public
Anyone can implement it without asking permission or paying a licence, which is why it turns up in so many programs and why files written twenty years ago still open.
Nothing is thrown away
ASS stores its content exactly. Saving it again changes nothing, so it can be opened, edited and re-saved as often as you like without accumulating damage — which is what makes it a working format rather than a delivery one.
What opens ASS
Aegisub and VLC read it, and so do most programs of the same kind.
If a file will not open, the format is rarely the problem — it is more often that the program predates it. Converting to something older is the reliable way past that, and it is what the rest of this site is for.
Opening it in a browser
No browser reads it.
That is the single most common reason to convert it: not that the format is bad, but that the place you want to show the file cannot read it.
It is a working format
ASS is meant to be opened and changed. Keep the file in this format for as long as the work is going on, and export from it whenever a finished copy is needed.
The facts, in one place
| Extension | .ass, .ssa |
|---|---|
| Media type | text/x-ssa |
| First published | 2002 |