Text Tools
Auto Video Captions
🔒 Runs in your browser
Add captions to a video automatically — generated in your browser, previewed live, and exported as SRT or VTT. No upload, no watermark, no subscription.
How to use this tool
- Choose the video you want captioned.
- A Whisper speech model (downloaded once, then cached) generates captions on-device while the video stays on your machine.
- Preview the captions over the video and export them as SRT or VTT.
Drop a video here or click to upload
MP4, WebM, MOV — captioned in your browser, nothing uploaded
Captions are generated entirely in your browser via a self-hosted speech model (ONNX/WASM, WebGPU-accelerated when available). Your video is never uploaded. The model downloads once on first use, then your browser caches it.
Frequently Asked Questions
- How are the captions generated?
- A Whisper speech model running in your browser (via ONNX/WASM, WebGPU-accelerated when available) transcribes the speech and times it into caption cues.
- Does my video get uploaded?
- No. The model file downloads once and is cached; from then on the video is captioned on-device and the video itself is never uploaded.
- What can I export, and is there a watermark?
- You can export SRT or VTT subtitle files, and there is no watermark and no subscription, unlike many server-based caption apps.
- Will I need to edit the captions?
- Usually a little — auto-captioning can mishear names, jargon, and unclear speech, so preview them over the video and fix any errors before exporting.
Processing EU personal data in your workflow?
GDPR compliance is required. EuroComply maps your obligations in minutes.