Captions That
Understand
Upload any video and CaptionDB detects scenes, analyzes keyframes with vision AI, and writes captions in five distinct tones โ formal to sarcastic.
Upload Your Video โEverything in AI Video Captioning
Upload & Analyze
Drop in MP4, MOV, AVI or WebM up to 500 MB. We instantly extract duration, FPS, codec and resolution.
01Scene Detection
Smart shot-boundary detection splits your video into meaningful scenes with precise timestamps.
02Vision AI Analysis
Keyframes are analyzed by a vision language model โ objects, activities, colors and on-screen text.
03Five Caption Tones
Every scene gets captions in formal, sarcastic, humorous-tech, humorous and audio-description styles.
04About CaptionDB
CaptionDB is an AI captioning platform where creators upload videos and receive scene-by-scene captions written by vision language models. Our goal is to make video accessibility and content repurposing simple, fast and delightful.
Create a project, watch the pipeline process each stage live, then browse every scene with its transcript, tags and five caption styles โ ready to copy or export.
Explore FeaturesMeet The Five Tones
Formal
Professional"A presenter demonstrates the product to an attentive audience."
Sarcastic
Witty"Ah yes, another riveting slide of bullet points. Groundbreaking."
Humorous Tech
For Devs"POV: the demo works and nobody knows why. Ship it."
Humorous
For Everyone"That moment when the coffee kicks in mid-presentation."
Audio
Accessibility"[Upbeat music] Footsteps on stage. Audience applause swells."