Auto generate timestamped chapters for YouTube descriptions — no upload, no sign up
Choose a video, AI finds where the topics change and generates timestamped chapters.
Optionally split the video at those chapters to reuse with our other tools
Open any chapter in the trim tool to fine‑tune its start and end
100% Private, your video never leaves your browser. Transcription and analysis happen locally on your device using WebAssembly and WebGPU. Nothing is uploaded to our servers.
Whisper AI transcribes your speech, then a small language model measures where the topic shifts and groups the transcript into chapters, each labelled from its own keywords and timestamped for YouTube chapters. You can then split the video at those points and drop each section into our subtitle, trim or resize tools.
This runs on your own device, so it works best on clips up to around 20 minutes. Longer videos take more time and memory.
Want to caption, chapter or generate videos automatically at scale? The Bannerbear API automates it for you. Plug it into your app or no‑code workflow and generate thousands of videos on autopilot.
Trim, resize, caption and combine your videos right in your browser, no upload and no watermark
Start a free trial with 30 API credits, no credit card required
