Preview your thumbnail in the real YouTube feed
Thumbo Lens is a free Chrome extension that shows your thumbnail exactly how viewers will see it - in the feed, at mobile size - before you upload it. It also lets you steal the style of any thumbnail on YouTube in one click.
Free Chrome extension · no account required to preview
Add it once, use it on every upload. Lens sits in your browser toolbar and works on any thumbnail file, from Thumbo or anywhere else.
Coming soon to the Chrome Web StoreWhat it does
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See it in the real feed
Thumbo Lens drops your thumbnail into an actual YouTube homepage and search feed mockup, next to real videos, at the real size. What you see is what viewers see - not a clean preview on a white background.
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Check your text is readable
Most thumbnails are judged at about 120 pixels wide on a phone. Lens shrinks your cover to that size right next to the full-size version, so you catch text that disappears before you upload it.
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Steal any style, instantly
Hover any thumbnail on YouTube and click Steal style to send it straight into Thumbo as a style reference. No screenshot, no download, no upload - the fastest way to start a new cover from a look you already like.
Free. No popups, no login walls. Thumbo makes money only when you generate a thumbnail.