A YouTube transcript summarizer with key moments
Not every video needs to be watched from start to finish. This YouTube transcript summarizer reads a video’s transcript and gives you the gist in a few bullet points or a short paragraph, plus a list of key moments — where each part of the video starts, with its timestamp — so you can jump straight to the bit you need.
Paste the transcript from the video’s “Show transcript” panel, or open a caption file (.srt, .vtt or .sbv) that a creator downloaded from YouTube Studio. Key moments and ready-to-paste YouTube chapters are worked out by code in your browser immediately; the summary is then written by AI on your own device. Add the video address and every timestamp becomes a link to that second of the video.
How to summarize a YouTube video
- Open the video on a computer, click “…more” under it, then Show transcript. Select the transcript text, copy it, and paste it here — or press Open .srt, .vtt, .sbv or .txt for a caption file.
- Optionally paste the video address, so key moments link to the video.
- Check the Key moments: each starts where the wording shifts to a new topic, with keywords as a provisional title. Change How many if you want more or fewer.
- Choose a summary format and length, then press Summarize video. With “Also write a title for each key moment with AI” ticked, each key moment also gets a short AI title.
- Copy the chapter lines into a video description, or copy or download the whole summary as Markdown or text.
YouTube Transcript Summarizer features
Key moments with timestamps
The transcript is split where its vocabulary changes (a TextTiling-style comparison of neighbouring sentences, nudged by pauses), and every part keeps its start time.
Chapters ready for YouTube
Chapter lines start at 0:00 and are checked against YouTube’s rules: at least three chapters, each at least 10 seconds long.
Summary on your device
Chrome’s built-in summarizer or IBM’s open Granite 4.0 model writes the summary locally; long transcripts are summarised in parts.
Works with every transcript
Transcript-panel text with or without timestamps, automatic or creator captions, .srt, .vtt and YouTube Studio .sbv files.
Links back to the video
With a video address, each key moment opens the video at that second; the Markdown export keeps the links.
Why you paste the transcript instead of a link
Tools that “summarize any YouTube link” fetch captions from YouTube behind the scenes with unofficial requests. YouTube’s Terms of Service don’t allow automated access such as scraping, nor downloading content except where YouTube authorises it, and its official API lets a channel download captions only for its own videos. So this page never contacts YouTube: you copy the transcript YouTube shows you, or use caption files you own. As a bonus, nobody — including this site — learns which videos you summarise.
If a video has no “Show transcript” button, it has no captions; you would need the audio, which you can only transcribe if you have the file (for example with Audio to Text on your own recording).
What the summary can and cannot tell you
- It only knows what was said. Anything shown on screen — a diagram, a code listing, a product close-up — is missing unless the speaker describes it.
- Automatic captions mishear names, numbers and technical terms, and those errors flow into the summary. Captions written by the creator give much better results.
- Small on-device models can merge steps or drop a caveat. Check instructions, doses, prices and safety advice in the video itself before acting on them.
- The “Key sentences (server)” engine quotes the most important sentences word for word with their timestamps — slower to read, but nothing is paraphrased.
- To read the full transcript as clean paragraphs instead, use the YouTube Transcript Extractor; to share a single moment, the YouTube Timestamp Link maker.
YouTube Transcript Summarizer FAQ
How do I summarize a YouTube video for free?
Copy the video’s transcript (“…more” → “Show transcript”), paste it into this YouTube transcript summarizer and press “Summarize video”. You get a summary plus timestamped key moments; nothing to install or sign up for.
Can I just paste the YouTube link?
No — the page does not download anything from YouTube, because that would break YouTube’s terms. Paste the transcript, and add the link only if you want the timestamps to point back to the video.
Does it work for videos without captions?
Only if you have the audio file yourself: transcribe it first, then summarise the text. A video without captions has no transcript to copy.
How are the key moments chosen?
Code compares the words of neighbouring sentences and starts a new key moment where the topic shifts most, with a minimum length so parts don’t get too short. The titles are the most distinctive keywords of each part, or an AI headline if you tick the option.
Can I use the chapters on my own video?
Yes. Copy the chapter lines into your video description; YouTube needs the first one at 0:00, at least three chapters and each at least 10 seconds long, which the page checks for you.
Is the transcript sent anywhere?
Not with the on-device engines: the transcript stays in your browser and only model files are downloaded, after you agree. The optional server engine sends the transcript’s sentences when you press the button and stores nothing.