How to Make Brave Leo Summarize YouTube Videos

The Brave Leo summarize YouTube method is short: open the video, open Leo, and ask. Leo is Brave's built-in AI assistant, so there is no extension to install and, for the free version, no account to create.

What takes more care is knowing what Leo actually read. This page separates what Brave documents, what a public bug report shows, and what you should check yourself. Everything about Leo here was checked against Brave's own pages in September 2026.

What Brave documents, and what it leaves out

Brave's Leo product page describes it as a way to "chat with any tab". It says you can ask Leo to "summarize a webpage, doc, or PDF", and that the browser sends "the necessary context from the page you're viewing" when the task requires it.

The same page lists a few practical facts worth knowing before you start:

• Access: type in the address bar and choose "Ask Leo", or click the Leo icon in the toolbar.
• Cost: Leo is free to use, and Leo Premium adds more models and higher usage limits.
• Account: none is needed for the free version.
• Models: both tiers offer models from Mixtral, Anthropic's Claude and Meta's Llama, and you can bring your own.
• Platforms: desktop (macOS, Windows, Linux) and mobile (Android, iOS).

The page does not mention YouTube, videos or transcripts. So there is no documented statement on that page of how Leo handles a video — whether it reads captions, the description, or both.

Steps to have Brave Leo summarize YouTube videos

1. Open the video in Brave on desktop and check it has captions — the CC button or a Show transcript option in the description.
2. Open Leo from the toolbar icon, so it opens beside the page.
3. Start a new conversation for this video rather than continuing an old one. The bug below is why.
4. Ask for a shaped summary, such as "five key points with the timestamp for each".
5. Spot-check two claims against the video before relying on them.

Asking for timestamps is worth the extra words. A point with a time attached can be checked in seconds; a point without one means scrubbing through the video.

The open bug: follow-ups can use the previous video

This is not documentation — it is an open GitHub issue in Brave's public tracker, opened on 21 December 2024 and still open when we checked in September 2026. Its title is "Transcript of previous video is used when asking follow up question in youtube."

The steps it lists: open a YouTube video with captions, ask Leo about it, click through to a different video, and ask Leo again. The first message uses the correct transcript. A follow-up question then uses the previous video's transcript, "resulting in unrelated answers about the current video".

The reporter says it is "easily reproduced" with both Brave's models and bring-your-own models, on a nightly build of Brave for Windows. The issue has no comments and no documented fix. Whether it affects the version you run is something only a test will tell you.

The issue is also the only place we found that shows Leo working from a YouTube transcript at all. It is a bug report, so treat that as an observation by one reporter, not a promise from Brave. The safe habit is the one in step three: a fresh conversation for each video.

Checking what Leo actually read

Brave is direct about this. Its product page answers "Does Leo hallucinate?" with "Yes, it does", and advises you to always double-check its responses. A summary of the wrong video, or of the description alone, can still read fluently.

1. Ask for a quote from past the halfway point, with its timestamp.
2. Open the transcript panel and search for a few words of it.
3. If the quote is missing, or matches a different video, start a new conversation and ask again.

What leaves your browser when you ask

Privacy is Leo's main pitch, and the product page is specific about it. When you ask a question, the browser shares your latest prompt, the context of the current conversation and, when needed, context from the page you are viewing.

Brave says it does not collect identifiers that can be linked to you, such as your IP address, and that conversations are not kept for model training. Chat history can be stored locally on your device, and temporary chats are deleted when you close them.

For a YouTube summary, that means the page context — whatever Leo takes from the video page — goes to Brave's servers with your question. If you bring your own model, it goes wherever that model runs instead.

Leo, a chatbot, or a dedicated summarizer

The differences come down to who gets the text and how much you can ask afterwards.

Pasting a transcript into a chatbot, as in our ChatGPT guide, removes the doubt about which text was used, at the cost of the copy step. Our Claude guide is relevant too, since Claude models are among those Leo offers.

When Leo is the right choice

You already use Brave. A summary without leaving the tab, with no account, is hard to beat for convenience.

You want to ask questions. Our tool gives a fixed summary — TL;DR, key takeaways, chapters and notes — with no chat. Leo lets you push back on a claim — just start fresh when you change videos.

You have used your five for the day. Our free tier gives five summaries a day, whatever the length or caption language. Leo is there for the sixth.

When it is the wrong choice: if you need to be certain which text the summary came from, Leo adds a layer you cannot see. Pasting the transcript yourself, or using a tool that reads only the caption track, removes that uncertainty. And if you work across several browsers, a tool that runs in any of them saves switching.

Frequently asked questions