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AI Subtitle Generator – Subtitles for Video Free Online

AI Subtitle Generator

Turn any video or audio into accurate captions — right in your browser.

100% In-Browser Private — No Upload Free
How it works: the AI model downloads once on first use (Tiny ≈ 40 MB, Base ≈ 75 MB) and is then cached in your browser — internet is needed for that first download only. After that it works offline. Your file never leaves your device. Transcription runs at roughly real-time speed on the Tiny model; long files take a while. Accuracy depends on audio quality and language.
🎙️

Drop your audio or video here

or click to browse — MP3, WAV, M4A, MP4, MOV, WebM & more · up to 30 minutes

Working…0%
Powered by Whisper AI running locally via Transformers.js · No account · No upload · Your media stays on your device

How to Generate Subtitles

Turn any video or audio into accurate captions with an AI speech model that runs entirely in your browser — your file is never uploaded.

  1. Drop your audio or video. MP3, WAV, MP4, MOV, WebM and more — up to 30 minutes per file. You will see the file name and size inside the upload box.
  2. Choose the AI model. Tiny is fastest; Base is more accurate but slower.
  3. Pick the spoken language. Choose the right language (or auto-detect) for the best accuracy.
  4. Hit Generate. The model downloads once on first use (Tiny ≈ 40 MB, Base ≈ 75 MB) and is then cached in your browser — internet is needed for that first download only. Transcription runs on your device at roughly real-time speed.
  5. Review and download. Check the segments, fix anything, then download SRT, VTT or plain text.

Honest note about accuracy

This is real speech recognition, not magic — clear audio in the selected language gives the best results. Noisy recordings or heavy accents may need a quick manual pass.

Common Questions

Is the subtitle generator free?

Yes — free, no account, no limits on how many files you transcribe.

Is my audio or video uploaded anywhere?

No. The Whisper model runs inside your browser; your file never leaves your device.

Why does it download something on first use?

The AI model (≈40–75 MB) is fetched once and cached in your browser. After that, transcription works without downloading again.

How long does transcription take?

Roughly real-time on the Tiny model — a 10-minute file takes about 10 minutes. The Base model is slower but more accurate.

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