SUB to SRT converter
Convert SUB to SRT: MicroDVD .sub files, the text kind that counts in frames, become timed SRT subtitles.
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This format stores times as frame numbers, so it has no meaning without a rate. We don't guess one.
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Choose EUC-KR if an older TV or player shows broken Korean characters. EUC-KR can't hold some characters, like emoji, and you'll see how many before you download.
Two very different files end in .sub. MicroDVD .sub files are text, with each line timed by frame number, and those convert here. You pick the frame rate the file was made for, because frame numbers only turn into seconds once the rate is known. The other kind comes from DVD rips, paired with an .idx file. That's VobSub, and it holds pictures of text, so it can't be converted here.
What changes when you convert SUB to SRT
Not everything survives the trip. Converting SUB to SRT drops or flattens the following:
Questions
How do I convert a SUB file to SRT?
Drop the .sub above, choose the frame rate it was made for, and download the .srt.
Which frame rate should I pick?
The rate of the video the subtitles were made for: usually 23.976 for film releases and 25 for European ones. If the converted subtitles drift as the video plays, the rate was wrong, so convert again with the other one.
Why won't my .sub file convert?
It's probably a VobSub file from a DVD rip. Those hold pictures of the subtitles, not text. If there's an .idx file with the same name next to it, that settles it: drop both on IDX/SUB to SRT instead.
Can I fix the timing after converting?
Yes. If every line is out by the same amount, shift it; if the gap grows as the video plays, use the frame rate converter.