Thumbnail at YouTube's perfect size
Drop an image, get a 1280×720 JPG ready to upload — plus Shorts and end-screen presets.
How it works
1
Drop an image
Any size — we'll handle the rest.
2
Pick a preset
Standard 1280×720, Short 1080×1920, or end-screen 1920×1080.
3
Download JPG
Cover-fit by default. Switch to contain if you want letterboxing.
Why use Toolstack's YouTube Thumbnail Sizes?
100% private
Your file never leaves your device — everything runs locally in your browser.
Instant
No upload, no queue. The result is ready as soon as your laptop finishes the math.
Free forever
No signup, no credit card, no daily limits for the core features.
Open standards
We use proven open-source libraries — no proprietary lock-in, no shady tracking.