Free • No signup • Runs in your browser
Thumbnail Resizer
Load a YouTube thumbnail or upload your own image, then resize it to common social, ad, and video dimensions — with JPG, PNG, or WebP export.
Load a thumbnail or upload an image to begin
Resizing happens entirely in your browser using the Canvas API — the image is never uploaded to our servers.
Related tools
YouTube Shorts Thumbnail Downloader
Grab the cover image from any YouTube Shorts link.
Open tool →Bulk YouTube Thumbnail Downloader
Look up and download thumbnails for up to 20 videos at once.
Open tool →Thumbnail Resizer
Resize a thumbnail to common social and ad dimensions, right in your browser.
Open tool →YouTube Thumbnail Size Guide
Every official thumbnail resolution and when it's actually available.
Open tool →Thumbnail resizer FAQ
Does the resizer upload my image to a server?
No. Resizing happens entirely in your browser using the HTML Canvas API. Only a YouTube thumbnail sourced by URL is fetched from YouTube's own CDN — nothing is sent to our servers.
What's the difference between crop to fill and stretch to fit?
Crop to fill keeps proportions correct by cutting off the edges that don't fit the target size. Stretch to fit forces the image into the exact dimensions, which can distort it if the aspect ratio changes.
Which format should I export?
JPG for photographic thumbnails (smallest file size), PNG for graphics or text-heavy designs where you need lossless quality, and WebP for a modern format that balances both.