CornerBrief: YouTube Summarizer for Gemini

One click from a YouTube video or thumbnail to an English or Chinese summary in your Gemini account. No API key needed.

Summarize YouTube videos with Gemini, straight from the corner of the video. CornerBrief adds a small hover entry to the YouTube player and video thumbnails. Click Summarize to open a fresh Gemini tab with the selected video link and a focused summary request already prepared. Read the main idea, review the key takeaways, then keep asking questions in your own Gemini conversation. HOW IT WORKS 1. Sign in to Gemini in the same Chrome profile. 2. Hover over a YouTube video or thumbnail and click the corner entry. 3. Continue in Gemini with the video's link and summary request already there. YOU STAY IN CONTROL • Summarize from the player, home feed, search results and video thumbnails. • Choose English or Simplified Chinese summaries in Options. • Send the request automatically, or prepare it for review and manual sending. • Start a new Gemini tab for every request, keeping existing conversations separate. • Existing drafts are preserved, and refreshing a handoff tab does not send the request twice. • No API key and no separate CornerBrief account are required. BUILT FOR A SMALL, CLEAR WORKFLOW Use it for lectures, tutorials, talks and videos you want to revisit. CornerBrief prepares the request; Gemini reads the video or transcript when available and generates the response. Video access, model availability and account limits are determined by Gemini. Sign-in is required. In Options, select English for the English workflow shown in the screenshots; Chinese is the default summary language. PRIVACY When you click, only the selected YouTube link, title when available and a prepared summary request are passed to Google Gemini. Preferences stay in local extension storage, and temporary request-routing data stays in Chrome session storage. There is no developer backend, analytics or advertising. The extension runs only on YouTube and Gemini and does not access browsing history across unrelated sites. CornerBrief is independently developed and is not affiliated with Google, YouTube or Gemini.