Articles tagged "YouTube"

MrBeast spends millions getting thumbnails right. We scored two of his biggest ones with Thumbly, applied the fixes it suggested, and re-scored. Here's what held up, what we'd change, and what you can steal.

Shorts get custom thumbnails now. The right size is 1080 × 1920 (9:16), not the 16:9 you use for long-form. Here's why that matters and how to add one.

The YouTube thumbnail size is 1280 × 720 at 16:9, and in 2026 YouTube started recommending up to 4K. Here's the full spec, what changed, and the size that matters more than the resolution.