What this site is
Thumbnail Grabber hosts two free utilities. The first pulls the thumbnail images that YouTube and Vimeo already publish for a given video, at every resolution they store. The second resizes and compresses any image to an exact pixel size — most often YouTube's required 1280×720, under the 2 MB upload limit.
Why it was built
Both jobs are small, and both are surprisingly annoying to do well. Searching for a thumbnail downloader turns up pages layered with pop-ups, fake download buttons and redirect chains, several of which quietly re-encode the image and add a watermark. Searching for an image resizer turns up services that upload your file to a server you know nothing about.
Neither tool here needs a server to work, so neither has one. That is the whole idea.
How the tools work
The thumbnail downloader reads the video ID out of the link you paste using JavaScript running on your device, then builds the public image addresses from it. The images travel directly from Google's or Vimeo's servers to your browser. Nothing passes through this site.
The resizer uses the HTML canvas element, which every modern browser includes. Your image is decoded, scaled and re-encoded in local memory. It is never transmitted anywhere.
Who maintains it
This is an independently run site. It is not affiliated with, endorsed by, or sponsored by YouTube, Google LLC or Vimeo, and it does not claim any rights in the thumbnails it helps you access — those belong to the creators who made them.
How it is funded
The tools are free and always will be. Running costs are covered by advertising, which is why you will see ad units on these pages. There is no paid tier, no upsell and no data being sold — what third-party advertising does involve is set out plainly in the privacy policy.
Feedback
If a link format fails, a size is missing, or something behaves oddly on your device, that is worth knowing about. The contact page explains how to get in touch.