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Video tools Subtitle Studio

AI correction for subtitles: why not just use ChatGPT?

You can run your SRT through ChatGPT, but a chat cannot hear your video. It makes sentences nicer instead of more accurate, and sometimes loses timecodes or lines. The AI correction in Subtitle Studio does the opposite: it only fixes clear transcription errors, checks every change against what was heard in the audio, and leaves everything else alone.

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What really happens

  1. Transcription on your MacWhisper turns speech into text with timing, locally. Punctuation, capitals, line breaks and reading time are then handled by fixed rules in the app, without AI. That is in Budget too.
  2. The AI looks for suspect wordsPer subtitle line, with the line before and after as context, the AI points out words that were probably misheard. Pointing only, nothing changed yet.
  3. The AI proposes a small repairFor each suspect word the AI picks from a few fixed actions: replace with what was said, join, split, remove a doubled word, or leave it.
  4. The app checks every proposalThe app does this itself, without AI. A new word must appear in what Whisper heard, or fix a clear typo. At most one word may be added, cosmetic changes do not count, and the line may not drift too far from the audio. Rejected means: the original text stays.
  5. You stay in controlPer video you see which lines were changed. Want literal speech, with every stumble in it? Turn on Literal mode.

In a chat or in the app

Pasting your SRT into a chatAI correction in Subtitle Studio
Hears the audioNo. The chat guesses what sounds logical, and can replace a correct word with a wrong one that seems more likely.Every change is checked against what Whisper heard in the audio. If it does not fit, the old text stays.
What was saidA chat likes to tidy text up: other words, other sentences. Then it no longer says what was said.Rewriting is ruled out. The AI may only fix misheard, wrongly joined, wrongly split or doubled words.
Timecodes and linesWith long files, numbers or times shift, lines disappear or the answer stops halfway.The app works line by line. Timecodes stay put, and the app sets line length and reading time itself afterwards.
Names and termsThe chat does not know your names and guesses.Lines with a protected term from your glossary are not sent to the AI.
Where your text goesAlways to the chat service.Choose the local AI and everything stays on your Mac. With your own key only the text goes to the service you choose, never your video.
Your effortCopy, paste, put back and check, for every video again.One tick for your video. Per video you see which lines the AI changed, with the text before and after.

How Subtitle Studio fits in

Live

AI correction is part of Subtitle Studio Pro. You choose where the AI runs: free and private on your own Mac, or with your own key at OpenAI, Anthropic, Google or Mistral. The app uses their small models there, so it usually costs a few cents per video. A ChatGPT or Claude subscription does not cover this: such a key is billed separately, per use.

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Frequently asked questions

What does the AI correction not change?

Punctuation, capitals, numbers, sentence structure and word choice stay as they are, unless the audio shows a clear error. When in doubt, the AI does nothing.

What can the AI correction not do?

The AI does not hear the audio itself; it compares with what Whisper heard. If Whisper misheard a word the same way everywhere, the AI cannot know. That is what your glossary is for: add names and terms and they are right every time.

Is an AI key expensive?

No. With the small models the app uses you usually pay a few cents per video. A ChatGPT or Claude subscription does not count; the key is billed separately. Prefer to pay nothing? Use the local AI on your Mac.

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Try it free on 3 of your own videos

The trial runs the complete Pro workflow. No payment details needed, just your e-mail address, and your video stays on your own Mac. What do you have to lose?

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