Free subtitle tool
SUP to SRT Converter
Turn Blu-ray SUP / PGS image subtitles into editable text, keeping their display times. Convert and proofread in your browser for free, without uploading a video.
Your file stays in this browser. OCR software and language data are downloaded on first use. Long files may take several minutes; keep this tab open.
How to convert SUP to SRT
- 1단계
Choose a SUP and language
Select an extracted Blu-ray PGS .sup file and its original subtitle language. Files up to 64 MiB are supported.
- 2단계
Recognize and proofread
Run local browser OCR, compare subtitle images and correct the text. OCR software and language data download on first use.
- 3단계
Download SRT
Resolve blank text and any missing final end time, then download UTF-8 SRT with the presentation times preserved.
Why does SUP need OCR?
- Blu-ray SUP / PGS stores subtitle images; SRT stores text. Renaming the extension cannot convert the content.
- Times come from the SUP presentation and clear events, without transcribing audio again.
- Your file is processed in the browser, without uploading it to a server or using paid vision models.
- OCR can misread characters. Review names and punctuation; SRT does not retain the original font, color or positioning.
자주 묻는 질문
Does this support MKV, DVD SUP or SUB/IDX?
Only extracted Blu-ray PGS .sup files are supported here. MKV videos, DVD SUP and VobSub SUB/IDX are not supported.
Will subtitle times change?
The converter uses SUP presentation and subsequent clear times. If the final clear event is missing, enter the last end time manually; it is not guessed.
Is my file uploaded?
No. Your browser parses and recognizes the file locally. OCR software and the selected language data are downloaded on first use.
Why should I proofread the results?
Unusual fonts, low contrast and punctuation can affect OCR. Low-confidence results are flagged, and blank text must be resolved before export.
Can SRT keep the original styling?
SRT does not retain bitmap fonts, colors, positions or animations. It preserves editable text and timing.
자막 번역도 필요하세요?
변환은 여기서 무료입니다. 타임라인을 완벽히 맞춘 채 자막을 다른 언어로 번역해야 할 때, 그게 바로 SubtitleFlow가 하는 일입니다.
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