It appears that ass to stl conversion seems to represent a transformation of subtitles from Advanced SubStation Alpha subtitles (.ass) to older Win2020 screen subtitle format (.stl). You have to use some dedicated subtitle editor or converter, but the support for .stl subtitles is pretty slim.
Home > Search converters: ass to stl
Conversion of ass file format to stl file format beta
Search for ass to stl converter or software able to handle these file types.
Convert Advanced SubStation Alpha subtitles to Win2020 screen subtitle.
We have found one software suitable in our database for this conversion.
On-line services software 
- convert ass to stl on web
SubtitleConverter.Net
An online converter for subtitles
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from ass file | Yes, SubtitleConverter.Net supports ass file conversion as a source file type. | No | No | No | No | No | No | No |
to stl file | Yes, SubtitleConverter.Net supports stl file conversion as a target file type. | No | No | No | No | No | No | No |
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.
Additional links: Open ass file, Open stl file
ASS
Files with ass extension are in most cases movie (video) subtitles extension saved in Aegisub Advanced Substation. Playable in most media players nowadays.
STL
Files with stl file extension can also be possibly found as old subtitles saved in Win2020 format.
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