Video Caption Generator - Add Captions Automatically

AI Caption Video Player Long‑video friendly

Single‑file website — just open this index.html.

Player

📼 Upload Video 💬 Add Captions (.vtt/.srt)

Tip: toggle captions with the CC button in the video controls. Use F for fullscreen.

Caption Tools

Works offline • WebVTT

Upload a .vtt file directly, or upload .srt and it will auto‑convert to WebVTT. You can also paste/edit below.

After editing, click Apply to Player to reload subtitles live.

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Optional: AI auto‑caption (bring‑your‑own‑key)

This demo includes a simple hook to call a transcription API (e.g., Whisper, AssemblyAI, Deepgram). You’ll need a small backend to accept the video and return text/vtt. Replace the endpoint below with your own.

Security note: Browsers block sending local files directly to 3rd‑party domains in some cases. Use a trusted backend you control.

Formats: .vtt recommended. .srt is auto‑converted. Long videos (1–3 hrs) are supported; performance depends on your device/browser.

Hotkeys: Space play/pause · J/L seek · K pause · F fullscreen · C toggle captions.