Best AI YouTube Video Summarizers (2026)
AI YouTube video summarizers turn long lectures, podcasts, and talks into a readable summary in minutes. The best tools handle videos of any length, preserve timestamps, and let you chat with the transcript afterwards. iPhone apps, web tools, and browser extensions all play in this category — pick by where you watch most.
The shortlist
Summio
Native iPhone app with chat over the full transcript and timestamp anchors. Works on lectures, podcasts, talks, and playlists.
YouTube Summary by Glasp
Free Chrome extension that adds a side panel to YouTube with a quick GPT-generated summary.
NoteGPT
Web app with a video-to-notes flow and an export to popular note apps.
Eightify
Chrome extension focused on key-point extraction with timestamps.
Common questions
Which is the best free YouTube summarizer?
Summio has a free tier with full mobile reading; on desktop, Glasp's YouTube Summary extension is a solid free option for quick GPT summaries.
Can YouTube summarizers handle long videos?
Yes — Summio, NoteGPT, and Eightify all handle multi-hour lectures and podcasts. Some browser extensions cap out around 60 minutes.
Do they preserve timestamps?
Summio preserves the original timestamps so you can jump back to a moment in the video. Glasp and Eightify also link key points back to the video timeline.
Try Summio free on iPhone
Open input — paste any book, YouTube video, article, or PDF. 27 languages. Free tier, no credit card to start.
Download Summio →