subtitle Format
ASS File Format
Advanced SubStation Alpha is a feature-rich subtitle format standard in anime fan-subbing, supporting custom fonts, karaoke timers, colors, and 3D positioning.
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PDF, DOCX, XLSX, PPTX, JPG, PNG, MP3, MP4, EPUB, ZIP and 100+ more
Technical Specifications
| Extensions | .ass |
| MIME Types | text/x-ssa |
| Category | Subtitle |
| Engine Tier | tier1-small-js |
| Magic Bytes / Sniffing | Container sniffing (ZIP / OLE2 / RIFF header inspection) |
| Opens With | Aegisub, VLC, MPV |
| Good For | Stylized anime subtitles, karaoke effects, and custom typography. |
| Not Recommended For | Mainstream web video players without WebAssembly subtitle renderers. |