SSA Converter
FileFlip converts SSA files into 5 other formats entirely inside your browser, using FFmpeg compiled to WebAssembly. The SSA file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. There is no file-size limit and no account to create.
How do I convert an SSA file?#
- Drop your SSA file onto the converter at the top of this page, or click it to pick one from your computer.
- Choose the format you want out of it. FileFlip downloads the engine that conversion needs, once, and your browser caches it.
- Conversion starts the moment you pick the format, and the result is yours to download. The work happens in this tab, so nothing is uploaded and nothing is queued.
Is it safe to convert SSA files online?#
Yes, because nothing is uploaded. FileFlip converts SSA files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What happens to a SSA file#
FileFlip converts SSA into 5 formats with FFmpeg, all of it inside the browser tab. Each conversion below names the engine it uses, what it downloads, and exactly what that conversion keeps or drops.
| Category | Subtitles |
|---|---|
| File extension | .ssa |
| FileFlip support | Read and written |
| Conversions available | 5 |
| Engines | FFmpeg |
| Downloaded to your browser | 30.8 MB on the first conversion, then cached |
What is an SSA file?#
An SSA file is a SubStation Alpha v4 script split into a Script Info section, a Styles section defining named formatting templates, and an Events section holding every line of dialogue with its timing, style reference and positioning, the same three-section layout ASS later extended.
Use SSA only when working with an existing v4 script or a tool that hasn't moved to ASS; a new styled subtitle is better authored directly in ASS.
Convert SSA to ASS to pick up transparency and the fuller set of override tags, or convert to SRT when the destination can't render styled subtitles at all and losing the styling is acceptable.
The SSA file format reference covers the specification, the programs that open one, and what each conversion keeps or drops.
SSA questions people ask#
Is SSA the same as ASS?
No, but they're the same lineage. SSA is SubStation Alpha version 4, and ASS (Advanced SubStation Alpha) is version 4+, an extension of the same three-section format that added an alpha channel for transparent colors, a numpad alignment system and karaoke tags SSA doesn't have.
Should I convert my SSA files to ASS?
It's worth it if you want transparency effects or the newer karaoke and override tags, since ASS is a strict superset of SSA and any renderer that plays ASS also plays SSA. If the file only uses basic styles and positioning, converting gains little.
What program opens an SSA file?
Aegisub is the standard editor for SSA and ASS scripts, and players like VLC and mpv render the styling and positioning directly. Because ASS renderers treat SSA as an earlier version of the same format, anything that opens .ass also opens .ssa.