Upload files with the file dialog
There are many subtitle formats in the world, many versions of these formats, and many of them have the same extensions despite internally different file formats (e.g. stl, sub or ttml, dfxp). Some are for the internet,some for TV, DVD or similar. If you fail to convert any of the files here, this may be the case. Unfortunately,universal tools do not exist. In my experience, the most popular formats are srt, ttml and vtt, practically every application supports them.
You can download a sample srt file to try the conversion.
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