Subtitle Generator: Free Browser Tool With Per-Word Timings

The Subtitle generator is a free Storrito tool that turns any video into an editable transcript with per-word timings. Whisper runs locally in your browser, so the file never leaves your device — no upload, no signup, no API key.

You can find it at storrito.com/tools/subtitle-generator.

What you can do with it

• Pick a video: MP4, MOV or WebM. Audio is extracted in your browser.
• Generate the transcript: Whisper runs locally on your CPU. The progress bar tracks the model download (first time only) and the transcription.
• Edit the transcript: click any word to seek the video to that point, then fix typos in place.
• Download SRT or per-word JSON: SRT works in any video editor or player. The per-word JSON matches the shape that OpenAI's Whisper CLI emits, which most modern pipelines (faster-whisper, WhisperX) read without adapter code.

Languages and accuracy

Auto-detect plus English, Spanish, German, French, Italian, Portuguese, Dutch, Japanese, Korean, Chinese, Russian, Hindi and Arabic. Quality varies by language and model size — English is the strongest. Three model sizes are available: Tiny (~75 MB) is rough, Base (~140 MB) is good for most clear-speech material, and Small (~470 MB) is the best the browser-side build supports.

When it works best

• One speaker
• Clear and audible speech
• Little or no background music or noise
• Clips of around 5 minutes or less. For longer videos, trim them first and run each segment separately.

Where it fits

The tool is free and standalone. No Storrito account is required. The transcript you generate can be edited locally and exported as SRT or per-word JSON. If you'd like to burn the captions into the video as animated subtitles, the Subtitle overlay tool accepts the per-word JSON directly.

If you have feedback or run into trouble, reach out to support.