What’s the best YouTube video summarizer right now?

I could suggest using Microsoft Copilot.

NotebookLM is a research-oriented AI tool launched by Google, acting as a reliable YouTube video summarizer, but it does not support direct analysis of URLs because it only supports manually uploaded subtitle files.

The software can generate structured summaries and accompanying FAQs in a single step, but to use this feature, you must first export the video’s subtitle file separately.

First, download the complete subtitle file for the target video from a video platform or subtitle tool. Log in to the software and create a blank notebook, then upload the saved subtitle file as source material.

Enter the following request in the AI dialog box:

• Summarize this video into key points that include timestamps and chapter titles. Review the structured summary, key points, and segmented outline generated by the software, and copy or export the content for your records.

Once the analysis is complete, you can continue to ask follow-up questions about the details in the uploaded subtitle file.

The software cannot generate video summaries directly by clicking a URL, so this practical YouTube video summarizer is only suitable for users willing to spend extra time preparing the subtitle file.

If you prefer not to use the summary tool in a browser extension, you can try this method. This requires additional manual preparation steps, so please carefully weigh the pros and cons.

Glasp is a Chrome extension that serves as a lightweight YouTube video summarizer, allowing users to take notes and generate AI-powered summaries of online videos. It automatically extracts video transcripts, generates timestamped key points, and supports one-click export of all annotations to major note-taking platforms, making it an indispensable tool for learners and researchers.

How to Use YouTube Video Summarizer

Step 1: Install the extension from the Chrome Web Store.

Step 2: Open any video page in your browser.

Step 3: Click the extension’s sidebar icon, then click the Summary button to trigger the AI analysis.

Step 4: View the generated content, including a full video summary, key points, and corresponding timestamps.

Finally, export your notes and summary to Markdown, Notion, or other supported formats as needed.

This browser extension offers a cost-free, one-click workflow for organizing lengthy videos. For users who need to organize video learning materials but don’t want to switch to third-party desktop software, it’s an ideal video summarization tool for everyday use.

Drawbacks

• The summary feature is only available for videos with official subtitles.
• Advanced AI features and private note storage require a paid Pro subscription.
• The quality of the summary depends largely on the completeness and accuracy of the video's subtitles.

Each tool has its unique interface, but generally, you can copy and paste the YouTube video URL into the tool, select the desired summary length, and get the summary in return. The effectiveness of these tools varies based on video quality, content, and the complexity of the video's content. Some may require you to sign up or use a browser extension, but most are accessible directly through their websites.

If you want a free, easy, and reasonably effective YouTube video summarizer, the "YouTube Summary with ChatGPT" extension is one of your best bets right now. Just keep in mind its limitations and consider customizing prompts for length and detail.

Video Abstract is a web-based tool specifically designed for YouTube video summarizer. Like Summarize.tech, you simply paste the URL and get a summary.

How It Compares to Your Original Request:
✅ Works from URL - Yes
✅ Free - Yes, completely
✅ Key points + timestamps - Yes
✅ Handles videos without captions - Should work with auto-generated subtitles
🔄 Chapter-aware - Unclear if it specifically leverages existing chapters
🔄 Exports - Likely copy/paste rather than direct file export
🔄 Length customization - Basic summary length, but less control than some tools

Video Abstract is absolutely worth trying - especially if you're hitting the time limits on other free tools. It's particularly good for:

• Longer videos (beyond 1 hour)
• Quick, no-fuss summaries
• Users who don't need advanced export features

Since you're exploring options, try Video Abstract with one of your longer videos, and compare the output quality with Summarize.tech and the Chrome extension I mentioned earlier. Different YouTube video summarizer can sometimes produce meaningfully different summaries based on the same video.

Trimit is a popular tool for YouTube video summarizer, and it offers a free tier that might suit your needs. Trimit offers a free plan that allows you to summarize videos, though there might be some limitations on the number of videos or length per day. For more advanced features or higher usage, they might offer paid plans.

How to use YouTube video summarizer:

• You paste the YouTube video URL into Trimit.
• It processes the transcript or captions (if available).
• It generates a summary with key points and sometimes timestamps.
• You can review the summary directly on their platform.

Pros

• Easy to use.
• Supports videos with or without captions.
• Provides concise summaries and key points.

Cons

• Free tier may have limitations on usage.
• Quality depends on the video's captions or transcript availability.
• Not always perfect for very long videos.

For a best YouTube video summarizer that can give you solid key points and timestamps directly from the URL, your best bet right now is Microsoft's own tools or integrated solutions. 

Microsoft Designer / Bing Chat / Edge AI Features:

• Bing Chat (with GPT-4) integrated in Microsoft Edge now offers some video summarization features, especially if captions are available.
• You can paste the YouTube URL into Bing Chat and ask for a summary, key points, or timestamps.
• Note: While not fully automated for chapter-aware summaries, it can give decent summaries for videos with captions or transcripts.

Why this works:

• Free with a Microsoft account.
• Easily accessible from Edge browser.
• Supports URL input.
• Handles videos with or without captions.
• Can generate short or detailed summaries on demand.

Additional suggestions about YouTube video summarizer:

• Microsoft Edge Sidebar + Bing Chat:  
• Open Edge, go to Bing Chat (or press the sidebar icon).
• Paste the YouTube URL.
• Ask for a summary, key points, and timestamps.
• Specify length: TL;DR or detailed.

What is the best YouTube video summarizer right now? yt-dllp is free and powerful for downloading videos, captions, or audio. Whisper (by OpenAI) is open-source and free to run locally if you have the hardware, allowing transcription without additional costs. GPT API can be used for summarization, but note that the API has usage limits and costs beyond free tiers. For a fully free solution, you might want to explore open-source summarization models like GPT-J or Llama. Parsing timestamps from captions or transcripts helps generate timestamps in summaries, which is exactly what you want for key points with timestamps.

Workflow:

• Download captions or audio with yt-dllp.
• Transcribe with Whisper (if no captions).
• Summarize with GPT API or an open-source YouTube video summarizer.
• Optionally, parse timestamps from captions or transcript.

If you have technical skills, this workflow is cost-effective (mostly only hardware and time).
If you prefer a more straightforward, less technical method, then web apps or browser extensions might be more practical, but they might not be entirely free or customizable.

The YouTube Summary with ChatGPT Chrome extension is one of the best tools currently available for quick YouTube video summaries. It offers a straightforward way to generate summaries directly on YouTube pages without needing to manually extract transcripts or use external tools.

How to use:

• Install the extension from the Chrome Web Store.
• Go to any YouTube video.
• Click the extension icon or activate it from the context menu.
• It will generate a summary in a popup.

Tips for best results:

• For longer videos, consider manually selecting key parts or running the summary multiple times with specific prompts.
• To get chapter-aware summaries, you may need to copy the chapter timestamps and ask ChatGPT to organize the summary accordingly.