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— Docs & FAQ

How PGSExtract works

PGSExtract reads the bitmap subtitle track out of a Blu-ray or DVD MKV — PGS or VOBSUB — and runs OCR on each frame to give you clean, editable SRT text.

The pipeline

  1. Parse in your browser. Your MKV is read locally in a Web Worker — the file never leaves your machine. Only the small extracted subtitle stream is uploaded.
  2. Upload the subtitle stream. Only the compact bitmap subtitle stream — extracted from the PGS or VOBSUB track — uploads directly to storage. Even hours of subtitles are only a few megabytes.
  3. OCR each frame. The text on every subtitle frame is recognised in the language you choose.
  4. Download your SRT. The recognised cues are written to a SubRip .srt file you can download and edit.

Supported formats

File-size guidance

Your full MKV stays on your machine. PGSExtract only uploads the extracted subtitle stream, which is typically a few megabytes even for a feature-length film — so uploads are fast regardless of how large the source video is.

FAQ

What does a credit cost, and when am I charged?

One credit converts one subtitle display set. You're charged only when a job succeeds, for the exact number of display sets produced — a job that fails or is cancelled is never charged. Credits never expire.

What's the free preview?

Every track can run a free preview of its first 100 display sets — no account and no card required. It costs zero credits so you can judge OCR quality before committing. Signed-in users get up to 5 previews per 24 hours.

How long are my results kept?

Your SRT output is retained for 30 days by default. You can change this in settings to anywhere from 0 (delete immediately after download) up to 365 days. The uploaded subtitle stream is deleted as soon as the job finishes.

Which languages are supported?

Over 100 languages, including every common Blu-ray subtitle language and both Simplified and Traditional Chinese. See the full list on the languages page.

What files can I convert?

MKV (Matroska) files that contain an image-based subtitle track — PGS (Blu-ray) or VOBSUB (DVD). Both are recognised automatically and converted the same way. Output is always SubRip (.srt) text in this version.

Do you support DVD (VOBSUB) subtitles?

Yes. DVD discs store subtitles as VOBSUB — bitmap images, just like Blu-ray PGS — so they need OCR too. Drop an MKV with a VOBSUB track and PGSExtract handles it exactly like a PGS track, including the free preview and per-track language choice.

Guides

Ready to try it? Create an account or run a free preview. Browse pricing and the supported languages.