Convert

The Convert screen is a batch converter. Drop in SRT, WebVTT, ASS, SSA, SUP, VobSub (.idx/.sub) or MicroDVD files and get SRT, WebVTT, ASS or plain-text files out. Conversion and OCR run on your computer. It needs a license.

Supported formats

SRT, WebVTT, ASS / SSA	Text formats — built-in conversion.
SUP	Blu-ray PGS image subtitles — built-in OCR.
VobSub	DVD subtitles as an .idx and .sub pair — built-in OCR. Adding just the .sub pairs it with a matching .idx in the same folder.
MicroDVD	Frame-based .sub text subtitles — built-in conversion.

The format is detected from the file extension, and for an ambiguous .sub file by whether a matching .idx exists. Badges at the top show which formats are supported.

Converting files

Drag files onto the window, or use Add subtitles or Add more files. Each file becomes a queue item with its detected format and a status. The Output control chooses the output format: SRT, WebVTT, ASS or plain text, depending on the input. Files are saved in the same folder with the same name; if two inputs would collide, the app appends (2), (3) and so on.

Convert files one at a time with the play icon on a row, or use Convert to process every checked item in sequence. Finished items show Show in folder; a failed one shows its error details. Check all, Uncheck all and Clear done manage the queue.

The OCR engine

SUP and VobSub subtitles are pictures, so they go through OCR inside the app — there is no external OCR tool. The first time, the recognition model is downloaded automatically, which needs an internet connection once. Windows machines use the graphics card through DirectML when it is available; everywhere else, including Macs, OCR runs on the CPU. A badge shows which is active. While a file is being read, a live status message appears under it. OCR cannot be cancelled once a file has started, so Stop lets the current file finish.

This is the only place the app runs OCR: Extract hands back image subtitles as .sup or .sub/.idx and you convert them here.

FAQ

How is this different from extracting subtitles?

Extract pulls tracks out of a video container. Convert takes a subtitle file you already have, in an older or image-based format, and converts it.

Does Convert need an internet connection?

Only the first OCR run, to download the recognition model. Everything after that is offline.

My SUP or VobSub conversion has wrong characters — why?

OCR is not perfect on low-resolution scans. Review the result in Edit Subtitles and try the Fix OCR errors option in Clean Up.

Can I convert a whole folder?

Yes — add all the files at once and convert them in sequence. For repeated jobs, a workflow can do it.