The Story Behind CaptionLab
Over 85% of social video is consumed without audio. Yet creating engaging, word-by-word highlighted captions required hours of manual keyframing inside complex video editing suites. Creators either settled for robotic autogenerated text or spent whole afternoons splitting subtitle chunks by hand.
We built CaptionLab to solve this fundamental problem. Inspired by the calm elegance of ElevenLabs and modern creative suites, CaptionLab pairs acoustic speech-to-text algorithms with browser hardware-accelerated video rendering. The result is instant, viral karaoke captions with zero friction.
Acoustic Precision
We obsess over every single frame. Sub-10ms alignment ensures words light up the exact microsecond they are voiced.
Local-First Privacy
Your videos and creative assets belong to you. We decode media in your browser and never train public models on your private content.
Cinematic Aesthetics
Captions should elevate video, not clutter it. From karaoke glow to custom watermarks, we treat typography as an art form.
Built for High Velocity
Whether producing 1 video or 1,000 clips a day, CaptionLab automates the tedious subtitle timeline slicing so you can focus on storytelling.
Join the Creator Community
CaptionLab is actively developed with contributions from creators, developers, and motion designers. Have a feature request or want to collaborate?