Captions are a draft until you review them
English automatic captions use Whisper tiny.en on your device. Names, accents, noise, music, and overlapping speakers can produce errors or hallucinated words. The editable SRT is the final source of truth. Do not publish generated captions without reading and listening to them.
A practical workflow
Select a clip up to 10 minutes. Generate English captions or paste your own SRT. Correct times and text. Export SRT for a player with toggleable captions, or burn the reviewed text into an MP4. Burned captions cannot be switched off.
Before you export
Use only media you own or have permission to process. Keep the source and inspect the result. Desktop Chrome or Edge is a useful starting point; memory, codecs, and graphics support vary by device. A readable error means the current file or environment needs a different workflow, not that a result was created.
Can I use another language?
Automatic transcription in this version is English only. You can paste your own SRT, but the bundled font may not cover every writing system. Check the rendered preview before using the result.
Do my files leave this device?
No media is uploaded by these tools. Your browser downloads pages and models from the website host, and the media engine from jsDelivr. Hosting requests and contact inquiries are explained in the privacy policy.