It appears that stl to ssa conversion is mostly related to attempts to convert subtitles from Win 2020 subtitle format (.stl) to Advanced SubStation Alpha subtitles (.ass), something that should be doable with dedicated subtitle editors or even some special subtitle converters.
Home > Search converters: stl to ass
Conversion of stl file format to ass file format beta
Search for stl to ass converter or software able to handle these file types.
Convert Win2020 screen subtitle to Advanced SubStation Alpha subtitles.
We have found one software suitable in our database for this conversion.
On-line services software 
- convert stl to ass on web
SubtitleConverter.Net
An online converter for subtitles
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from stl file | Yes, SubtitleConverter.Net supports stl file conversion as a source file type. | No | No | No | No | No | No | No |
to ass file | Yes, SubtitleConverter.Net supports ass 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 stl file, Open ass file
STL
Files with stl file extension can also be possibly found as old subtitles saved in Win2020 format.
ASS
Files with ass extension are in most cases movie (video) subtitles extension saved in Aegisub Advanced Substation. Playable in most media players nowadays.
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