Zloth - AI YouTube Video Summarizer

YouTube video summaries in one click. Key takeaways, timestamped notes & custom prompts. Free version available — no API key needed.

Zloth is an AI YouTube video summarizer that gives you instant summaries of any YouTube video — right from the thumbnail. Stop watching entire videos just to find the one thing you need. One click, and you get AI-powered key takeaways, timestamped notes, and a structured video summary so you can decide in seconds whether a video is worth your time. HOW IT WORKS Zloth adds a "Summarize" button directly to YouTube thumbnails and video pages. Click it, and an AI summary appears — no copy-pasting links, no separate apps, and no API key required. CHOOSE YOUR SUMMARY STYLE Analysis — Key takeaways and main arguments, distilled into clear bullet points. Perfect for quick decisions on whether a video is worth watching. Summary — A structured breakdown with clickable timestamps that jump you to the right moment. Great for long videos, lectures, tutorials, and anything where you want transcript-style navigation without leaving YouTube. Custom prompt — Ask anything about the video content. Extract specific details, compare arguments, or turn a talk into study notes. (Premium) ORGANIZE YOUR VIDEO NOTES Save AI summaries to folders and build your personal video knowledge library. Sign in with Google and your library syncs across every device. Dark mode and a clean, minimal UI that stays out of your way. GENEROUS FREE TIER 90 free credits every month — 1 credit per minute of video. That is hours of video summaries at no cost. Upgrade to Premium for 1,500 credits/month, or grab a one-time credit pack whenever you need more. PRIVACY-FIRST Zloth only activates on YouTube. No browsing data is collected, no ads, no tracking. Your summaries are stored securely in the cloud and belong to you. PERFECT FOR Students summarizing lectures and study material. Researchers scanning talks and interviews. Professionals staying current without watching every video. Content creators analyzing competitors. Anyone who watches YouTube to learn — not to waste time. Zloth is not affiliated with, endorsed by, or sponsored by YouTube or Google LLC. YouTube is a trademark of Google LLC. Summaries are generated by AI and may be inaccurate or incomplete. Always verify important information independently.