Zloth icon Zloth

AI Summaries. Right
from the Thumbnail.

Click summarize on any YouTube thumbnail — no need to open the video. Every summary is saved to your browser, organized in folders, ready when you are.

Add to Chrome

Why Zloth?

Most YouTube summarizers make you jump through hoops. Zloth works where you already are.

Open the video, find the extension button
Click "Summarize" right on the thumbnail
Summary disappears when you close the tab
Every summary is saved and organized in folders
Copy the URL, paste it into another tool
Built directly into YouTube

Features

⚡

Summarize from the Thumbnail

Hit summarize right from the YouTube thumbnail — no need to open the video.
📂

Your Personal Summary Library

Every summary is saved. Organize in folders and sync across devices.
📝

AI Summaries

Chronological summaries with clickable timestamps — jump to what matters.
🔍

AI Analysis

Key takeaways only, without watching the whole thing.
✏️

Custom Prompts

Write your own prompt at no extra cost.

Markdown Enabled

Results in Markdown, ready to copy in one click.

Summarize Right from the Thumbnail

No need to open the video first. Click the "Summarize" button directly on any YouTube thumbnail and get instant AI-powered insights. Save time by deciding what's worth watching before you commit.

Clickable Timestamps That Jump to Key Moments

Get chronological summaries with clickable timestamps. Click any timestamp to jump directly to that moment in the video. Find the exact information you need without scrubbing through hours of content.

dark mode

Key Takeaways Without Watching the Whole Thing

Get objective analyses that extract only the key takeaways. Understand the main points, arguments, and conclusions without watching the whole thing. Perfect for research and quick decision-making.

AI analysis view
light mode

Write Your Own Prompts for Personalized Results

Write your own prompts to get exactly the insights you need. Want bullet points? A specific format? Technical details? You're in control of how the AI summarizes—at no extra cost.

Organize in Folders & Sync Across Devices

Organize your summaries in custom folders and sync them across all your devices. Sign in with Google, and your entire library stays in sync automatically. Drag and drop to reorganize, track unread summaries with badges.

Folder organization and sync

Copy-Ready Markdown Output

All summaries are returned in clean Markdown format. Copy with one click and paste directly into your notes app, docs, or anywhere else. No reformatting needed—ready to use instantly.

Pricing

2 months
off!

Free

$0
  • • 90 credits per month
  • • Built-in prompts only
  • • Store up to 20 summaries in folders
Add to Chrome

Premium

Best Value
$3.75 /month

$45 billed annually

  • • 1500 credits per month
  • • Custom prompts (and built-in prompts)
  • • Clickable timestamps
  • • Unlimited summary collection
Need more credits? Top up 1,000 credits for $4.99 · valid for 12 months

1 credit = 1 minute of video summary

Frequently Asked Questions

Yes, there is a free version with 90 minutes per month.

You can buy extra credits (or upgrade to premium if you haven't already).

Yes, you have to use the extension with the same Google account that you use for YouTube.

1 credit = 1 minute of video summary, regardless of the prompt type.

Yes, free and subscriptions credits expire after one month. Credits from the Credit Pack expire after one year. Subscription credits are always consumed first.

Yes, currently there is a 1000 character limit for your custom prompt. This limit might be increased in the future.

The built-in Summary and Analysis modes use English. Your custom prompt can be written in any language and the AI will usually answer in it.

Google's Gemini AI.

Yes, You can cancel any time in the billing portal. Login on the website and click "Manage subscription", or use "Manage subscription" from the extension's settings.

No, currently the extension is only available on Google Chrome. I hope to bring this extension to other browsers in the future.

You can always reach out to us by filling out the contact formular or sending an email to support@zlothai.com.