About Subtitle Doctor

Subtitle Doctor exists because fixing a subtitle file should take seconds, not a signup form, an upload queue and a watermark. Every tool on this site runs entirely in your browser: the file is read locally with JavaScript, transformed locally, and downloaded locally.

That architecture is why there are no file size limits, no batch caps and no accounts — there is no server doing the work, so there is nothing to ration. It is also why your files stay private: nothing is transmitted, logged or stored anywhere.

Since launch that has grown to cover extracting subtitles straight out of MKV, WebM and MP4 files without uploading a gigabyte of video, a fix-common-errors pass that reports what it changed rather than asking you to trust it, merging split releases and stacking two languages for learners, and PDF transcripts that render every writing system correctly. Still to come: automatic audio-based sync, and OCR of DVD and Blu-ray image subtitles — all client-side, like everything else here.

Found a file this site gets wrong, or a tool you wish existed? Mail hello@subtitledoctor.com. A subtitle file that breaks a tool is the most useful thing you can send — every awkward format quirk handled here came from a real file that did not parse.

There are no ads on this site, nothing is upsold and no account is ever required. If it saved you some time and you would like to keep it that way, you can buy me a coffee. Entirely optional — every tool works exactly the same either way.