Free, instant, and entirely in your browser — your subtitle file is never uploaded.
MicroDVD counts frames, not seconds — this has to match the video.
SRT is the plainest subtitle format there is: a number, a start and end time, the lines of text, a blank line, repeat. It came out of a 1990s DVD-ripping program called SubRip and has outlived every format designed to replace it, precisely because there is almost nothing in it to go wrong.
ASS is a typesetting language that happens to carry subtitles. Named styles, exact positioning, rotation, fades, karaoke timing and vector drawing all live in the file, split across a [Script Info], a styles and an [Events] section.
People make this conversion at the start of a typesetting job. A translation arrives as SRT, and the signs on screen, the on-screen text and the speaker colours all still have to be done — which SRT cannot express and ASS can. What you get here is the groundwork: every line moved across intact into a proper [Events] section with one Default style, ready to open in Aegisub. The creative work is still ahead of you; this just stops you doing the retyping first.
You want ASS because you are about to typeset, not merely translate. Going into ASS is what opens the door to named styles, exact positioning, fades and karaoke timing in an editor like Aegisub. The conversion does not create any of that — it gives you a clean file with one default style, ready for the work to begin.
The target format can do far more than the source ever could, but a conversion cannot invent design that was never there. What you get is a well-formed file with a single default style — correct, playable, and ready to be styled properly in an editor like Aegisub. The gain is real but it is potential: the capability is now available to you, not already used.
No. The conversion runs in your browser using JavaScript — your SRT file is read from disk, converted in memory and handed back as a download. Nothing is transmitted, so there is nothing for us to store or delete. You can disconnect from the internet after this page loads and the conversion still works.
People make this conversion at the start of a typesetting job. A translation arrives as SRT, and the signs on screen, the on-screen text and the speaker colours all still have to be done — which SRT cannot express and ASS can. What you get here is the groundwork: every line moved across intact into a proper [Events] section with one Default style, ready to open in Aegisub. The creative work is still ahead of you; this just stops you doing the retyping first.
The page checks before it converts. Subtitle formats are identified by what is inside the file rather than by the extension — which matters, because .sub alone is used by three unrelated formats. If you hand this page something that is not SRT, it says so and points you at the all-format converter instead of producing a broken file.