Thumbnail Preview.
Thumbnail Preview
Other tools test your thumbnail after you publish — impressions already burned. Preview sites use stale screenshots from months ago.
This tool pulls 12 live competitor thumbnails from YouTube’s API. Drop your file. 3 seconds to preview.
The only thumbnail tool built into your browser.
Live grid at every size
World First Browser OS
Launch from Quick Launch
150+ Tools
Optimised for Photoshop.
Not for the Grid
That Counts.
The problem nobody talks about.
You design thumbnails in isolation. White artboard. Perfect lighting. Bold text. Colors tested against a grey background.
Then YouTube places your video between a MrBeast clip with 80 million views and a Veritasium explainer with a thumbnail that's been professionally tested. The two videos either side of yours have been in search for months. Their thumbnails have been refined, split-tested, and optimized for that exact grid position.
Yours has been optimized for Photoshop.
That's the gap. You tested against a white background. Your viewer judges you against real competition.
Test Before You Upload
Every major tool is optimised for after you upload. This one is built for before.
- TubeBuddy → Tests thumbnails after you publish. The impressions are spent. The first cohort of viewers already made their decision — click or skip. You can’t un-burn an impression.
- vidIQ → Has a preview tool. It lives in their web dashboard. Another login. Another tab. Another upload form. You’ve left your workflow to use a tool bolted on as an afterthought.
- Preview Sites → Stale data. Screenshots from three months ago. Fake competitor thumbnails. Ad mazes between you and the result. None of them were built for this. This one was.
Zero ads = zero interruptions = focus that compounds.
YouTube Thumbnail
Preview.
How It Works —
Step by Step.
Live data. Real competitors. Every size. Zero upload required.
- Search any query → The tool fetches 12 live results from YouTube’s API — real thumbnails, real view counts, real channel names, real upload dates. The actual competitive landscape as it exists right now.
- Drop up to 4 thumbnails → PNG, JPG, WebP. Each variation gets its own tab — V1, V2, V3, V4. Give each a title. See exactly how the title-thumbnail pair reads in context.
- Your thumbnail enters the grid → At position 4 of 12 by default. Your design is now surrounded by real competitors, not a blank artboard.
- Shuffle to any position → Click once. Your thumbnail jumps to position 1, position 8, position 11. Find the position where your design stops working. If it holds at every position, it’s ready.
- Dark and light YouTube themes → Half your viewers use dark mode. A thumbnail that pops on dark can fade on white. Toggle — instant switch.
- Desktop, tablet, and mobile → Click once. The entire grid reflows to phone width. Watch what happens to your text at stamp size.
The Phone Test.
40% of Viewers.
Postage Stamp Size.
The test creators come back for. Not because it's complex — because it's the one that reveals what desktop always hides.
40% of YouTube traffic comes from mobile. On a phone, your thumbnail shrinks to the size of a postage stamp. The bold 72pt text your designer spent three hours on becomes three pixels. The face close-up that dominated on desktop merges into the background.
Switch to mobile viewport. If you can't read your text at phone size, your viewer can't either. Fix it now. Not after 10,000 impressions have already answered the question for you.
Cached Searches.
Zero Friction.
Iterate Fast.
No API Wait.
Your API key stays in local storage. Nothing leaves your browser.
- Search once, cache forever → Search “best noise cancelling headphones” once. Results are cached. Come back the next morning. Click the chip. The same 12 competitors reload instantly — no API call, no wait.
- Download your winner → PNG, JPG, WebP. Each variation gets its own tab — V1, V2, V3, V4. Give each a title. See exactly how the title-thumbnail pair reads in context.
- Privacy first → Your API key stays in local storage only. Nothing leaves your browser. No accounts, no tracking, no third-party data sharing. No other toolkit previews thumbnails AND scrapes data in one browser. The YouTube content tools do.
Part of the
YouTube Toolkit
Eight tools for creators who take YouTube seriously. Use one. Use all eight.
AI-generated summaries of any YouTube video in seconds
Extract metadata, stats, and details from any YouTube video or channel
Screenshot any moment and paste as a clickable timestamp link
YouTube Transcript Extractor →
Copy the full transcript of any YouTube video with one click
YouTube Thumbnail Downloader →
Download any YouTube video thumbnail in full resolution
Capture high-quality screenshots from any YouTube video
Convert any YouTube clip into an animated GIF
Automatically skip YouTube ads without clicking
Block the Sign Out button. Protect every Google session.
Every tool launches from the same extension. One keyboard shortcut. Zero tab switching.