How to summarize a YouTube video with AI

A 48-minute video usually contains about six minutes of information. Here's how to get those six minutes without watching the other forty-two — using the transcript YouTube already generates, so nothing needs uploading and it works on videos of any length.

The trick that makes this work: don't try to get AI to "watch" the video. Use the transcript. YouTube auto-generates one for almost every upload, it sits right there in the page, and it's plain text — which is exactly what an AI sidebar reads best.

The method — about 90 seconds

Step 1. Open the video and expand the description

Click ...more under the title to expand the description box.

Step 2. Click "Show transcript"

It's at the bottom of the expanded description. The transcript opens in a panel on the right, timestamped.

No "Show transcript" button? The creator disabled captions and auto-captions failed — usually music, very poor audio, or an unsupported language. Skip to the fallback below.

Step 3. Open your AI sidebar and attach the page

Click the extension icon, then turn on the page toggle so it reads what's on screen — transcript included.

Step 4. Ask for the summary you actually want

This is where most people undersell it. "Summarise this" gets you a vague paragraph. Be specific:

Summarise this video transcript in 6 bullets. Skip the intro, the sponsor read and the sign-off.

What are the 3 main claims in this video, and what evidence does the speaker give for each?

Give me the actionable steps only. Numbered list. Ignore the storytelling.

Is there anything in this video I couldn't get from reading a two-paragraph article? Be honest.

Prompts by video type

Tutorials and how-tos

Extract the steps as a numbered checklist. Include any specific settings, versions or values mentioned.

Interviews and podcasts

Summarise each speaker's position separately. Note where they disagree. Quote the most interesting line.

Product reviews

What did the reviewer like, what did they dislike, and what's the verdict? Include any price mentioned. Flag whether this looks sponsored.

Lectures and talks

Give me the argument structure: thesis, supporting points, conclusion. Note anything stated as fact without evidence.

News and commentary

Separate the facts reported from the opinions offered. Two lists.

Long videos — over an hour

Very long transcripts can exceed what fits in a single request. Two ways round it:

Ask for structure first. "Give me the main sections with timestamps." Then ask about the one or two sections you care about.
Scroll the transcript panel in halves. Attach the page, ask about the first half, scroll, re-attach, ask about the rest.

The first approach is usually enough — for a two-hour podcast you rarely want all of it, you want the twelve minutes that matter.

If there's no transcript

Try auto-translate. In the transcript panel, some videos offer generated captions in other languages even when the original is missing.
Check the comments. On popular videos someone has often posted a timestamped breakdown. Attach the page and summarise that.
Use the description. Many creators include chapter markers and a summary already.

Need a sidebar that reads the page? Install WriterPi — free, ten summaries before any signup, no card.

Two honest caveats

Auto-captions get names and jargon wrong. If a summary quotes a surprising figure or an unfamiliar term, verify it in the video before repeating it anywhere that matters.
Tone doesn't survive. Sarcasm, a joke, a pointed pause — the transcript flattens all of it. For anything where delivery is the point, a summary will mislead you.

Where this genuinely saves time

Deciding whether a video is worth watching at all. Thirty seconds of summarising beats twelve minutes of skipping around the scrubber trying to work out if the useful part ever arrives. Most of the time it doesn't — and knowing that quickly is the real win.