Free tool · no install · works on your phone
Free auto subtitles — generate & burn captions with Whisper
Whisper listens to your clip and writes the captions: download the SRT for YouTube and editors, or burn styled captions into the picture. Every major platform charges for this — here it's free, and it runs in about a minute.
Preview free · download moves the result into your free Aperture library · 100 MB per file · first 60 s processed
How to auto subtitles online
- Drop a talking-head video (it needs an audio track).
- Pick burn-in (captions rendered into the video, plus the SRT) or SRT only.
- Press Generate captions — this one takes a minute or two.
Why auto subtitles with Aperture
- Word-level Whisper transcription
- YouTube-ready SRT download
- Styled burn-in with a readable box
- Free — competitors charge for exactly this
FAQ
Which languages are supported?
Whisper covers 90+ languages and auto-detects the spoken language.
What if my clip has no sound?
The tool tells you before processing — silence has nothing to transcribe.
SRT or burned-in?
SRT for YouTube, editors and accessibility settings; burn-in when the platform has no caption support (Instagram feed, some players).
More free tools
Need the full studio? Open the Aperture editor — timeline, transcript search, guest review, platform exports — free plan included.