# Key Moments and Chapters for YouTube Videos > SumAI breaks a YouTube video into chapters and key moments with timestamps. Tap a time to jump to that part instead of scrubbing through the whole video. - Source: https://getsumai.app/features/key-moments-and-chapters/ - Last updated: 2026-11-12 - About: SumAI: YouTube & PDF Summary, an AI summarizer app for iPhone and iPad **Tap a moment. Jump right in.** SumAI breaks a video into chapters and key moments with timestamps. Tap a time and the video jumps to that part, so you can go straight to the section you came for instead of scrubbing through an hour of footage. ## Highlights - **The shape of the video.** See what a video covers, and in what order, before you commit an hour to it. - **Tap to jump.** Every key moment has a timestamp. Tap it to go to that part of the video. - **A style built for long videos.** The Chapters summary style goes section by section. It was added in SumAI 2.0 for long videos. - **Timestamps everywhere.** The same timestamps appear in Ask AI answers, in the mind map and in the full transcript. ## Why long videos need a map A two-hour podcast is not one thing. It is twelve conversations, and you probably want three of them. Without chapters, finding those three means dragging the playhead and guessing. Key moments fix that. They turn a long video into a list you can scan in ten seconds: - 0:00 The forgetting curve - 7:24 Why cramming fades - 18:40 The Feynman technique - 34:15 Spaced repetition in practice - 52:30 Sleep and memory That list is the example from SumAI's App Store page, for a 1 hour 12 minute lecture. Each line is a doorway into the video. ## Key moments, chapters, timestamps: what is what - **Timestamp:** a time in the video, such as 18:40. - **Key moment:** a timestamp with a title, marking where an important idea begins. - **Chapters:** the video divided into sections. In SumAI, the **Chapters** summary style writes a summary for each section in turn. SumAI derives all of these from the transcript, which is why they are available for any video that has captions, whether or not the creator added chapters on YouTube. ## Three ways to use them **Read, then spot-check.** Read the summary first. When a point matters, or sounds surprising, tap its key moment and listen to the original for a few seconds. **Watch only what you need.** Skim the chapter list, pick the sections that answer your question, and watch those at full attention instead of the whole video at half attention. **Come back later.** A week after watching a lecture, you rarely need all of it again. You need the eight minutes on the part you forgot. Key moments take you there. ## Timestamps as a way to check the AI Timestamps are also what make an AI summary checkable. A claim without a location is hard to verify. A claim with a timestamp takes ten seconds to confirm. In SumAI the same anchors appear in three places: in the key moments list, in [Ask AI](https://getsumai.app/features/ask-ai-chat/) answers, and in the [full transcript](https://getsumai.app/features/youtube-transcript/). Whichever you are reading, the source is one tap away. ## How to jump to the key moments of a YouTube video 1. **Summarize the video in SumAI.** Paste the YouTube link, or share the video from the YouTube app. For a long video, choose the **Chapters** style. 2. **Open Key Moments.** The summary lists the video's key moments, each with its timestamp and a short title. 3. **Tap a time.** Tap a timestamp to jump to that part of the video. Watch as much as you need, then move to the next moment. ## Frequently asked questions ### What are key moments in a video? Key moments are the points in a video where a new topic or important idea begins, each marked with a timestamp and a short title. In SumAI, tapping a key moment jumps to that part of the video. ### Does the video need to have chapters on YouTube already? No. SumAI works from the video's transcript, so it does not depend on the creator having added chapters. The video does need captions or auto-generated subtitles. ### What is the Chapters summary style? Chapters is one of SumAI's five summary styles. It summarizes a video section by section instead of as one block, which makes long videos much easier to navigate. It was introduced in SumAI 2.0. ### Can I use key moments to skip sponsor segments and intros? Key moments show where each topic starts, so you can jump directly to the part you want and pass over anything in between.