CaptionSwift adds auto captions to short videos right in your browser - no signup, no install. Upload an MP4/MOV up to 1 minute, get AI captions for Hinglish or English audio, fix any word in the editor, pick from 5 caption styles, and export the finished MP4. Your video stays on your device; only the audio goes for transcription, and the finished file passes through a 10-minute one-time download link. Free: 2 videos per day per connection.