Offline AI transcription and subtitles

Transcribe audio and video into subtitles or text with Whisper, running entirely on your own computer.

Explore Pro

Windows · macOS · Linux

aTube Catcher includes whisper.cpp, an offline build of OpenAI's Whisper speech-recognition model. Your files are processed on your computer and are not uploaded to a server.

Save the result as an SRT or VTT subtitle file, as plain text, or burn the subtitles straight into a copy of the video. You can also turn on "Transcribe after download" to subtitle videos as soon as they finish downloading.

Transcription options

  • Transcribe to SRT, VTT or TXT, or burn subtitles into the video Free
  • Whisper models from Tiny (fastest) to Large (most accurate) Free
  • Separate speakers (diarization) Pro

How to transcribe a file

  1. Open Transcribe Files

    In the Video Converter, choose the transcription tool.

  2. Add your audio or video

    Pick the file you want to transcribe.

  3. Choose the language and model

    Leave the language on auto-detect or choose it. Pick a Whisper model: Tiny (~75 MB) is fastest, Large (~3 GB) is the most accurate.

  4. Choose the output format

    SRT or VTT subtitle file, TXT, or burn the subtitles into the video.

  5. Transcribe

    Start the job. The first time you use a model, it is downloaded once and kept on your computer.

Platforms and limits

  • Windows and macOS include the transcription engine. The Linux build doesn't include it yet.
  • Each Whisper model is downloaded the first time you use it, from about 75 MB (Tiny) to about 3 GB (Large).
  • Larger models are more accurate but slower, especially on computers without a fast processor.
  • Separating speakers (diarization) is a Pro feature.

Frequently asked questions

Is the transcription done online?

No. Whisper runs on your computer. Only the model file is downloaded the first time; your audio and video stay on your machine.

Is transcription free?

Yes. Transcribing to subtitles or text is included in the free Community edition. Separating speakers needs Pro.

Which languages are supported?

Whisper can auto-detect the language, and the app lets you pick English, Spanish, French, German, Italian, Portuguese, Russian, Japanese or Chinese directly.

Can I add the subtitles to the video?

Yes. Choose the burn-in option and aTube Catcher writes a new video with the subtitles drawn into the picture.

Related features

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